Piping system

PIPING SYSTEM AND PLAN
AN EFFICIENT PIPING SYSTEM IS ESSENTIAL TO THE SAFETY AND
CORRECT OPERATION OF ANY ENGINEERING COMPLEX:
This is especially true for marine installation like ships. A ships
machinery / deck contains hundreds of meters of piping and
hundreds of fittings.
Valves, strainers, branch pipes, etc. Are examples of fittings
which are found in a pipe system. Piping arrangement cover all
systems and fittings.
The influences of operational and safety requirements , as well
as legislation result in somewhat complicated arrangements.

PREPARATION OF PLAN
• It is a usual practice for piping plans to be in
diagrammatic form and this is accepted in general by
most classification society rules.
• Many firms adopt the method of having a separate
diagram for each of the piping system on vessel
which simplifies the work and reduce possibility of
mistakes.

EXAMPLES OF PIPING SYSTEMS
• Bilge system.
• Ballast system.
• Oil fuel transfer system.
• Oil fuel service system.
• Cooling water system.
• Lubrication oil system.
• Compressed air system.
• Steam system.
• Exhaust system.
• Boiler feed system.
• Cargo tank pumping system.
• Inert gas system. & etc. etc .

POINTS TO BE TAKEN CARE IN DIAGRAMATIC
FORM OF PIPING SYSTEM:
• Representing pipelines moving in line to each other:
As diagrams are two dimensional so system in vertical plane
will be one above the other and it will be difficult for an
observer to follow the diagram. To avoid possibility of this
problem all pipelines in vertical plane are placed side by side.
• Representing pipelines moving at angles or perpendicular to
each other:
It is important to make it clear whether lines which cross each
other represent pipes which are entirely separate or form a
pipe junction.

• Size of pipeline i.e. Bore of pipe to be clearly stated
on the plan. Outside diameter or the thickness of
the pipe should be stated for pressure pipes and for
air and sounding pipes which are fitted to tanks
forming part of ships structure.
• Direction of flow should be indicated on pipe: i.e.
leading to and from pumps and each pipe should be
completed to the final terminal point.
• Diagrams of bilge system in the machinery space
should indicate capacity of the pumps for bilge
service etc.

USE OF SYMBOLS
• Symbols are most helpful in diagrammatic work.
Some firms have table of standard symbols
amounting to 100 or more in numbers. This would be
exceedingly difficult to keep their meaning in mind
without constant reference to the table. It is always
advisable to keep the no. of symbols within
reasonable limits and they should be indicated in
some convenient position on each plan.

General pumping arrangement
• The basic plan for most ships pumping system
shows suction pipes, together with air and
sounding pipes, for all the compartments
outside machinery space.

Non Return Valves on hold bilge
suction

Blanking arrangement for deep
tanks

Closing appliances for air pipes

Bilge system tanker machinery space

Bilge system
• Features:
Main bilge line to which the bilge suctions from various
compartments are connected with two bilge pumps.
Emergency bilge suction from machinery space led to
main circulating pump or to the cooling water pump
sea inlet line.
In tankers one direct bilge suction in after well, while
the bilge injection and the other direct bilge suction
are fitted at opposite sides of the forward end of
machinery space.

Reciprocating pump suction lifts at various
temperatures.

Limitation of filling pressure by relief pipe

Overflow arrangement for daily service and
settling tank

Overflow arrangement-- common breather
pipe

Cooling water returns to sea inlet.

Emergency lubricating supply in turbine
ships

Steam System
• Saturated steam is led from the oil fired boiler or the exhaust
gas boiler at a normal pressure of 7.0kg/cm2. The steam line
from each boiler goes to the common 7.0kg/cm2 steam line
from where steam is distributed to users. The common steam
line has a branch to the steam dump valve which is pressure
controlled and dumps excess steam to the drain cooler.
• Caution: Water hammer in steam lines can be a problem and
can cause damage to the pipe system and even steam line
failure resulting in scalding of personnel. It is essential that all
steam lines are drained of condensate and that steam be
supplied to cold lines gradually with line drain valves open.
This allows the steam line to warm through and for the
condensate to drain. Drain valves are located at a number of
places in the steam system and these must be opened before
the steam valve to that section of line is opened.

Procedure for Supplying Steam to the Steam System
The auxiliary boiler is operating on automatic control and generates
saturated steam at a pressure of 7.0kg/cm2. The description assumes
that the entire steam system is shut down and is being warmed through
from cold.
a) Ensure that the boiler is operating correctly and that the correct steam
pressure is being generated.
b) Start the sea water cooling system for the central fresh water coolers and
ensure that there is a LT cooling water flow through the drain cooler.
c) Open all steam line drain valves and drain the section of steam pipe of
condensate as the pipe warms up. Where drain traps are fitted, line drain
valves may be left open after the pipe has warmed through, otherwise
the drain valve must be closed when the pipe is warm and steam issues
from the drain valve.
d) Open the steam inlet valves to the steam supply section systems.

Procedure for Supplying Steam to the Steam System
e) Where a steam supply valve is linked with a temperature
controlled valve the operating medium for that valve (if any)
must be available at the valve.
f) When a steam line is warmed through and steam is issuing
from the drain, close the drain valve.
g) Ensure that each steam line’s associated drain valves are
open and that the drain trap is functioning.
h) Frequently check the steam system for signs of steam
leakage.
Note: The drain inlet system to the dump condenser and the
inspection tank must be functioning.

Drains & Feed water system description
• Drains from the auxiliary steam services are returned to the cascade tank, via the
drain cooler and the inspection tank. The condensate is then returned to the feed
water system. As there is a possibility of contamination from hydrocarbons from oil
heating services, the drains are checked in the inspection tank before returning to
the system, the inspection tank is also fitted with an oil content detection probe.
From the inspection tank the condensate returns to the main body of the cascade
tank via a weir line with and external isolating valve and a filter grid. The drain
cooler is also used to condense excess steam generated by the exhaust gas boiler
in order to maintain the desired steam system pressure. The drain cooler
condensate water level is maintained by a water trap in the water outlet.
• Valves at the drain line entry to the condenser allow the drain cooler to be
bypassed if necessary allowing the condensate to flow directly to the inspection
tank. This arrangement allows the temperature of the water in the inspection tank
to be increased, by allowing hot condensate directly into the inspection tank,
there is no control feature on the bypass line. The condenser bypass can also be
used when the dump condenser is being serviced, or when it is defective.
• Water flows from the bottom of the inspection tank to the filter tank which is
provided with a steam injection heating system in order to heat the boiler feed
water should that be necessary.

• The level in the cascade tank is maintained automatically by transferring distilled water from
the distilled water tank by means of the feed water transfer pump, float switches located in
the after end of the cascade tank control the starting and stopping of the pump. The cooling
water transfer pump may be used for this duty should the feed water transfer pump be
unavailable. The cascade tank is equipped with a low level alarm and a low temperature
alarm.
• The inspection tank is fitted with a inspection windows and hydrocarbon monitoring
equipment. Should any oil be detected an alarm will sound, steps must then be taken to
prevent the pumping of oil into the boilers. The flow from the inspection tank to the cascade
tank via isolating valve is from the bottom of the inspection tank, therefore this will reduce
the risk of oil carry over to the cascade tank in the short term (depending upon how big the
oil leakage is into the condensate system) and hence to the feed pump suction. Any floating
sediment or oil in the inspection tank should then be drained through the scum line into the
inspection tank to the bilge.
• Water from the cascade tank provides the boiler feed pumps with a positive inlet head of
pressure to the pump suctions. The condensate outlet temperature from the drain cooler
should be sufficient to maintain a temperature of 90°C in the cascade tank. As mentioned
previously, the drain cooler bypass valve allows direct entry from the drains in to the
inspection tank. If the temperature of the feed water in the tank cannot be maintained in this
way, there is a direct live steam injection line into the condensate tank which is fitted with a
temperature regulator.

• A salinity sensor is located in the feed pump suction line, this may be
bypassed if required. The sensor is linked to a salinity alarm.
• There are two boiler feed pumps; these are used for the oil fired auxiliary
boiler and the exhaust gas boiler. Each boiler has two feed water lines, the
main feed line to each boiler has a control valve which is regulated by the
water level in the boiler. In order to ensure a flow of water through the
feed pump, even when the feed control valve is closed, there is a return
line from the feed pump outlet to the cascade tank. The line from each
pump is fitted with an orifice plate in order to reduce the pressure of the
water returning to the cascade tank. The auxiliary feed valve on each
boiler allows manual control of the water level should there be a
malfunction in the feed control system.
• Drain traps allow the passage of condensate but not steam, therefore they
allow for efficient use of heating steam as the latent heat of evaporation is
recovered when the steam condenses. If a drain trap is defective it will
allow steam to pass and this results in low efficiency.

• Oil Contamination : If oil contamination occurs every effort must be made
to avoid pumping oil into the boilers. The scum valve should be opened in
order to remove oil from the surface of the inspection tank. The
temperature in the inspection tank should be maintained in order to assist
in the oil removal operation. If oil is present in the inspection tank, the
drains from the drain traps on all the oil system steam services should be
checked until the defective service is located and this must then be
isolated for repair. After repair, the drain line and drain trap from the
defective service must be cleaned to remove all traces of oil. The
inspection tank and the oil content monitor probe must also be cleaned.

• The heating coils in the following services return to the inspection tank
through the drains cooler:
• HFO storage, service and settling tanks
• Calorifier
• Heat exchanger for the accommodation
• Steam tracing
• Air conditioning unit
• Oil fired and exhaust gas boiler systems
• Waste/sludge oil tanks
• FO and LO sludge tanks
• Main engine LO tanks
• Main engine LO sump tank
• HFO and LO separator heaters
• Main engine, boiler and diesel generator HFO system heaters
• FO overflow tank
• Main engine and generator engine jacket FW preheaters
• Reefer containers CFW heater

• Procedure for Preparing the Main Condensate System for
Operation This description assumes that the system is not yet
operational.
a) Ensure that the pressure gauge and instrumentation valves are
open.
b) Fill the cascade tank from the distilled water tank using the feed
water transfer pump. The distilled water tank outlet valve must
be open as must the feed water transfer pump inlet valve and
outlet valve . The inlet valve to the cascade filter tank must be
opened, the pump should be operated manually until the
cascade tank reaches the desired level and then transferred onto
automatic control. The manual/automatic (MAN/AUTO) selection
switch is on local group starter panel (LGSP) for the feed water
transfer pump in the air conditioning/refrigeration plant area .

c) Check the cascade tank is at the correct level when the boiler is at its
operating level.
Operational conditions has shown that a high head of water in the distilled
water tank has a tendency to force its way through the feed water transfer
pump when the pump is set for automatic operations with all of the
system valves open. Therefore due to the low losses in the system except
for when blowdown operations are carried out, the feed transfer pump
can remain in manual with the inlet valve to the cascade tank shut.
d) Set up the drain system valves according to the following tables: It is
assumed that the LT cooling system is in operation.
e) The various services can now be put into operation as required, by opening
the associated drain trap outlet valve.

Note 1: In an emergency the cooling water transfer pump may be used
to replenish the cascade filter tank from the distilled water tank.
Crossover valves must be open as must the pump suction valve and
discharge valve . It is essential that the suction valves from the jacket
water drain tank and air cooler water drain tank , are closed when
using the cooling water transfer pump for transferring boiler feed
water.
Note 2: Drain valves for all systems are normally left open when a drain
trap is fitted, however, if a service is shut down for maintenance the
drain valve should be shut as well as the steam valve after the line has
been allowed to cool down. The cooling down period is required in
order to ensure a vacuum is not formed in the steam line if any
remaining steam in the heating coil/ heater condenses.
Note 3: Excessive temperature at the drains cooler would indicate a
defective drain trap. Services should be isolated in turn until the
defective trap is located.

Boiler Feed Water System
• The boiler feed water system is the section of the steam generating plant
which circulates feed water from the cascade tank to the oil fired auxiliary
boiler and the exhaust gas boiler via the boiler feed water pumps and the
feed water regulators.
• The feed water flow to each boiler is automatically controlled by the feed
water regulating valve in accordance with the variation in water level in
the boiler, to maintain the water level constant.
• Two boiler feed pumps take suction from the cascade tank and supply the
boilers at a maximum rate of 15m3/h and pressure of 15kg/cm2. The feed
pumps supply the oil fired auxiliary boiler and the exhaust gas boiler via
the main and auxiliary feed lines. The main lines to each boiler are fitted
with a feed water control valve which automatically regulates the flow of
water to the boiler, in order to maintain the correct water level. The
auxiliary feed lines provide for direct feed supply; manual control of the
water level in the boiler is required when using the auxiliary feed line.

Boiler Feed Water System
• A small amount of water is directed back to the cascade tank from each
feed pump outlet before the feed pump discharge valve; the discharge line
from each pump to the cascade tank has an orifice plate in order to
reduce the pressure of the water flowing back to the cascade tank. This
water discharge ensures that there is always a water flow through the
operating feed pump even when the boiler feed control valve is closed.
• There are chemical dosing units which supply treatment chemicals to the
boiler system. Each dosing unit has a pump which pumps a measured
quantity of diluted treatment chemical into the feed system over a period
of time. Treatment chemical in the dosing tank is diluted with water from
the hydrophore system. One unit pumps treatment chemical into the feed
suction line before the feed water pumps. There are two other chemical
dosing units, one pumping chemical into the feed line to the oil fired
boiler and the other pumping chemical into the feed line to the exhaust
gas boiler; which unit operates depends upon which boiler is operating.

Procedure for Preparing the Boiler Feed Water System
for Operation
• The description assumes that the feed water pumps are set to supply the
oil fired auxiliary boiler and exhaust gas boiler, with one pump set as the
duty pump and the other as the standby pump. The main feed valves are
being used via the feed regulator.
• a) Ensure that the pressure gauge and instrumentation valves are open.
• b) Set up the valves as required.
• The feed water pumps can be started and stopped locally or from the
pump control screen display in the engine control room; at the control
screen one of the pumps is started as the duty pump and another is
selected as the standby pump, the pump display is shown below. The
standby pump starts automatically if the operating pump is unable to
maintain pressure for any reason. A pressure switch on the discharge side
of the pumps provides the start signal for the standby pump. The
Local/Remote selector switch for each pump is located on it’s respective
group starter panel (GSP) on the main switchboard.

Procedure for Preparing the Boiler Feed Water System
for Operation
• Failure of the running pump or a pressure drop below the cut-in set value
will start the standby pump.
• For initial start only:
a) Shut the discharge valve of the selected feed pump.
b) Start the feed pump locally and slowly open the discharge valve until the
discharge line reaches working pressure.
c) Check the operation of the feed water valves on the boiler .
d) Fill the boiler(s) to working level. If filling from empty it is preferable to use
the auxiliary feed line until the boiler is at it’s correct level.
e) Set the duty pump to Master and other pump to Standby. The boiler(s) can
now be brought into operation.
Note: When supplying chemical feed treatment to the boiler(s), the
treatment supply valves to the feed water pipe on the boiler in use must
be opened and the chemical treatment dosing pumps started.

Water Sampling and Treatment System
• Sampling and treatment of the boiler water is undertaken in order to
prevent corrosion and scale formation in the auxiliary and exhaust gas
boilers and to prevent the degradation of the steam quality. Incorrect or
inadequate boiler water treatment will seriously damage the boilers and
frequent testing and treatment is needed in order to reduce the risk of
damage. Even though distilled water is used for boiler feed, the risk of
corrosion is present. The pH of the water changes in service and oxygen
can dissolve in the water where the feed system is open to the
atmosphere. Although maintaining the feed water temperature at a
relatively high value, above 60°C, will minimise the amount of dissolved
oxygen, the problem is ever present.

• Analytical tests and chemical treatment must be undertaken in
accordance with the instructions supplied by the chemical manufacturer.
The treatment must be added in order to maintain the chemical levels
within an acceptable range. Excessive treatment can often result in more
severe damage than insufficient treatment. The results of chemical
analysis on the boiler water must be recorded and the effects of the
treatment added can be monitored over a period of time. Floating solid
materials in the boiler can be removed periodically by means of the scum
valve for each boiler, whilst dissolved solids can be reduced by blowing
some of the water out of the boiler and replacing it with fresh distilled
feed water. This is boiler blowdown and it is accomplished by opening the
boiler blowdown valve for each boiler. The scum and blowdown lines
connect to the same blowdown pipe which connects into the starboard
overboard sea chest.

• The oil fired auxiliary boiler and the exhaust gas boiler are provided with
water sampling connections, the outlet from these being directed to a
sample cooler which is cooled by water from the domestic cold water
system; the sample cooler is located on the bulkhead directly outboard of
the oil fired boiler. When taking a sample of water from the boiler the
water must be allowed to run from the boiler for a minute in order to
ensure that a truly representative sample is obtained. The sampling valve
on the boiler is located so that it will produce a representative sample, but
old water in the lines and cooler must be purged before the testing sample
is drawn. The boiler water must be tested every day. The instructions
supplied by the water treatment test kit supplier must be followed
precisely in order to ensure that the boiler water is correctly treated.

• Chemicals to be added to the boiler water are mixed with water in
chemical dosing unit tanks. Chemical treatment from two of these units
injected into the feed lines after the feed pumps but before the feed water
regulator for each boilers, the feed water line to the pumps has it’s own
injection pump and dosing tank.
• Both the auxiliary boiler and the exhaust gas boiler use the same feed tank
and so they use the same treated feed water. When shutting down one of
the boilers for a short period of time (such as the exhaust gas boiler when
the ship is in port) it is essential to ensure that the water in the boiler has
been correctly treated. A water test should be carried out as soon as
possible after a shutdown boiler is put back on line.

Procedure for Taking a Sample of Boiler
Water
a) Open the sample cooler fresh water inlet valve and check the flow of fresh
water through the sample cooler.
b) Open the water sample inlet valve on the sample cooler and slowly open
the sampling valve on the boiler from which a water sample is required
and allow boiler water to flow through the sample cooler. For the exhaust
gas boiler there is also a line valve which must be opened first. Ensure that
water is leaving the sample cooler outlet and not a mixture of steam and
water. If the temperature of the boiler water leaving the sample cooler is
too high, reduce the flow of boiler water to the sample cooler.
c) After the boiler water has been flowing for one minute, collect a sample of
the boiler water for analysis.
d) Close the boiler sampling valve and then close the sample cooler cooling
water valve and the sample inlet valve.
e) Analyse the sample of boiler water in accordance with the instructions of
the chemical treatment supplier and record the information. Add chemical
treatment to the boiler feed water dosing units as required.

Procedure for Taking a Sample of Boiler
Water
WARNING
• The sampling lines from the boiler are under boiler pressure and the
temperature of the water being drawn from the boiler is high. Care must
be taken when operating the sampling equipment. The cooling water
supply must be confirmed to be flowing before the boiler sample valve is
opened. Valves must be opened slowly

Chemical Treatment Supply to the Boiler
Feed Water
• After analysis of the boiler water a decision must be made as to the
amount and type of chemicals which are to be added to the boiler feed
water, if any. The chemical treatment supplier’s instructions must be
followed precisely as under treatment and over-treatment can result in
boiler damage. Chemical treatment must be recorded in the boiler water
treatment log book.
WARNING
Care must be taken when handling boiler water treatment chemicals.
Protective clothing and goggles must be used.
Note: It is essential that details of water analysis are recorded together with
details of the treatment added. Only with detailed information is it
possible to determine the cause of possible future problems.

Boiler Blowdown
• If the level of boiler water dissolved solids is too high, some of the water
must be removed from the boiler and replaced with distilled water from
the feed tank. The procedure for blowing down the boiler safely must be
followed. If the ship is in port the bridge must be consulted in order to
ensure that blowing down the boiler will not cause danger.
WARNING
When blowing the boiler down the overboard discharge valve must be
opened before the boiler or scum blowdown valves. Opening the boiler
valves first will subject the blowdown line to full boiler pressure.

Procedure for Blowing Down the Auxiliary and
Exhaust Gas Boilers
The blowdown procedure must be performed during low load.
a) Check with the bridge that it is safe to blow down the boiler if the ship is in
port.
b) Open the ship’s side blowdown valves .
c) Ensure that the boiler is filled to the high water level.
d) Slowly open the boiler scum valve and reduce the water level to the
normal position, then close the scum valve.
e) Refill the boiler to the high water level position and blow down the boiler
using the blowdown valve. After the blowdown of the boiler, close the
boiler blowdown valve and then close the line and ship’s side valves.
f) Test the boiler chemical concentrations and adjust as necessary.

Distilled water Transfer and Distribution
System
• The distilled feed water is supplied to the cascade tank from the distilled
water tank or if necessary from the main engine air cooler drain tank
which receives condensate water from the main engine air coolers when
the main engine is in operation. From the distilled water tank (or the main
engine air cooler drain tank) water is transferred to the cascade tank via a
feed water transfer pump located in an area below the bottom plates on
the starboard side. Control level floats in the cascade tank control the cut-
in and cut-out operation of the pump when it is set into automatic
operation. The pump can be started locally or from the starter panel on
LGSP which is located in the air conditioning/domestic refrigeration room.
The manual/automatic selection switch for the pump is also positioned on
this panel.

Distilled water Transfer and Distribution
System
• If the feed water transfer pump is inoperative, it’s duties can be taken over
by the cooling water transfer pump, in which case the two crossover
valves must be opened. When the cooling water transfer pump is used for
this duty it will be necessary to control the starting and stopping of the
pump manually.
• The distillate from the fresh water generator can be discharged to the port
and starboard fresh water tanks via a rehardening filter and silver ion
steriliser. When the distillate is to be directed to the distilled water tank
for use in the boiler, the rehardening filter and steriliser unit must be by
passed.

Procedure for Preparing the Feed Water Transfer
Pump for Operation
a) Ensure that the pressure gauge and instrumentation valves are open.
b) Open the distilled water tank outlet valve and the feed water transfer
pump inlet valve and outlet valve . Open the inlet valve to the cascade
filter tank . Set the pump into manual or automatic mode (MAN/AUTO).
c) Check the cascade tank is at the correct level when the boiler is at its
operating level.
• Operational conditions has shown that a high head of water in the distilled
water tank has a tendency to force its way through the feed water transfer
pump when the pump is set for automatic operations with all of the
system valves open. Therefore due to the low losses in the system except
for when boiler blowdown and scumming operations are carried out, the
feed transfer pump can remain in manual mode with the inlet valve to the
cascade tank shut.

Procedure for Preparing the Feed Water Transfer
Pump for Operation
• When blowdown and scumming operations are to take place the cascade
inlet valve should be opened and the pump set into AUTO mode. On
completion of the boiler water condition control, the pump can be set
back into manual and the cascade tank inlet valve shut. It is important that
notice is made to the engineering staff on which valve in the system is
shut when the pump is on manual control.
Note: In an emergency the cooling water transfer pump may be used to
replenish the cascade filter tank from the distilled water tank. Crossover
valves must be open as must the pump suction valve and discharge valve
. It is essential that the suction valves from the jacket water drain tank
and air cooler water drain tank , are closed when using the cooling water
transfer pump for transferring boiler feed water.

Main and Auxiliary Sea water Systems
• The main sea water cooling pumps supply cooling sea water to the two
low temperature central fresh water coolers. Main sea water cooling
pump No.3 which is fitted with a twin speed motor and a self priming unit
has an emergency direct bilge suction form the starboard forward tank top
area, the valve handwheel of which projects approximately 1.0m above
the floor plate level.
• The fresh water generator sea water pump operates the vacuum ejector
on the FW generator, it also provides cooling water to cool the vapour
produced during operation and supplies the FW generator with feed
water.
• The sea water pumps take suction from the SW crossover main which
connects with the low sea chest on the port side of the ship and the high
sea chest on the starboard side. The common sea water suction manifold
has suction filters at each end, the filters connecting with the port and
starboard sea chests at the sides of the vessel.

• An anti-fouling marine growth prevention system (MGPS) is fitted which
inhibits the growth of marine organisms in the entire sea water system
and prevents corrosion in the system. The MGPS system must be
operational at all times when the sea water system is working.
• The sea suction valves at each sea chest are remotely operated by means
of hydraulic deck stand valves located at the 3rd deck level; the deck stand
valve for valve is located just aft of the HFO service tanks, the deck stand
valves are located just aft of the auxiliary boiler control panel. If necessary
the valves may be operated locally if required. This is carried out by lining
up the manual handle and spindle key slot and inserting the attached
drive key. It is necessary to swing the bypass lever on the control cylinder
to the open position, turning the valve handle will operated the valve in
the required direction. The overboard discharge valves for the reefer
cooling sea water system and the fresh water generator sea water system
are operated locally. The discharge lines are lead to common overboard
sea chests rather than directly to the ship’s side.

• The starboard overboard sea chest houses the discharges from the central
coolers, FW evaporator, main engine air cooler drain tank cooling water
transfer pump (via an oil content sampling unit), ballast overboard
discharge to starboard, auxiliary and exhaust gas boiler blowdown, black
and grey direct sewage discharge. The port overboard sea chest serves the
reefer container coolers, port ballast discharge, bilge discharge from the
fire and bilge pump and the discharge from the cargo hold pump.
• The main cooling sea water pumps discharge to a common sea water
pressure manifold which supplies sea water to the two central fresh water
coolers. The sea water then flows overboard through the starboard
overboard sea chest. A branch line from the main sea water pump
discharge line supplies water to the sewage plant for flushing purposes.
• The reefer cooling sea water pumps discharge into a common sea water
pressure manifold which supplies the two reefer fresh water coolers. The
sea water then flows overboard through the port overboard sea chest.

• The central fresh water coolers and the reefer fresh water coolers have a
facility for backflushing, the backflushing system is operated in order to
remove debris from the sea water side of the cooler; this helps maintain the
effectiveness of the coolers. Each cooler has an inline filter at the sea water
inlet, this must be maintained in a clean condition by removal and manual
cleaning as necessary. The interval between cleaning of the inline filter (and
backflushing) depends upon the nature and condition of the sea water in
which the vessel is operating. An increase in the sea water pressure drop
across the cooler indicates fouling and cleaning of the inline filter is
necessary. If this cleaning does not reduce the pressure drop the cooler
should be back flushed. Inline filter cleaning at monthly intervals should
maintain the cooler sea water surfaces in a clean condition.
• Cleaning of an cooler inline filter means removal of the filter from the cooler.
This requires the cooler to be isolated from the sea water circulation system,
by closing the cooler sea water inlet and outlet valves, and then draining of
the cooler sea water side. Sea water in the cooler is drained to the bilge and
the operator must be prepared to pump the bilge after draining the cooler.
Each central cooler holds approximately 987 litres of sea water, the reefer
cooler each hold approximately 307 litres of sea water.

• The sea water cooling pumps can be started and stopped locally or from the pump
control screen display in the engine control room; at the control screen one of the
pumps is started as the duty pump and another is selected as the standby pump,
the pump display is shown on the next page. The standby pump starts
automatically if the operating pump is unable to maintain pressure for any reason.
A pressure switch on the discharge side of the pumps provides the start signal for
the standby pump. The Local/Remote selector switch for each pump is located on
it’s respective group starter panel (GSP) on the main switchboard. The GSP for each
main sea water pump also houses an ammeter, hour meter, space heater on/off
switch plus indicator and a start/stop button.
• Failure of either running pump or a pressure drop below the cut-in set value will
start the standby pump.
• Other pumps taking suction from the SW crossover main are:
 Fire and general service pump
 Fire and bilge pumps
 Two ballast pumps
• The port low sea chest has a vent pipe extending to the upper deck level,
additionally, each sea chest has a steam connection for weed/ice clearing.

Procedure for the Operation of the Sea Water Cooling
System Crossover Suction Main
a) Ensure that all suction strainers are clear.
b) Ensure all the pressure gauge and instrumentation valves are open and
that the instrumentation is reading correctly.
c) Set up the valves as shown in the table below. In this case the low (port)
sea suction is in use
d) Ensure that the MGPS is operational and start the MGPS when one or
more sea water pumps is operating, the procedure for operating the
MGPS is described on page 6 of this section.
e) The sea suction main is now fully functional, the required sea water
pumps may be started as required when a consumer is lined up.

Procedure for the Operation of the Main Sea Water
Cooling System
a) Ensure that the sea water crossover suction main is operational as
described above.
b) Ensure all the pressure gauge and instrumentation valves are open and
that the instrumentation is reading correctly.
c) Set up the valves as shown in the table below.
d) Select the duty pump(s) and the standby pump for the main cooling sea
water system and start the duty pump(s) from the screen display.
e) Vent the coolers to ensure that there are no pockets of air in the line.
Main sea water pump No.3 offers the system a degree of flexibility and
therefore an increase in the plant efficiency due to it’s twin speed
operation mode, this allows the delivery volume of the sea water pumps
to be more closely matched to the cooling load. Normally two pumps are
required for operation when the sea water temperature reaches 26°C.

Procedure for the Operation of the Backflushing
System on the Main Central Fresh Water Coolers
a) Ensure that the cooling load will be maintained by one cooler while the
other one is being backflushed. Each main cooler has a capacity of 60% of
the maximum cooling load on the system. The cooler being back-flushed
will still be generating a cooling effect as the silt/debris is being cleaned
away.
b) Set the sea water cooling valves as indicated below:
• For No.1 Central Fresh Water Cooler
 Open the backflushing outlet valve and inlet valve
 Close the sea water inlet valve and outlet valve
• For No.2 Central Fresh Water Cooler
 Open the backflushing outlet valve CS29 and inlet valve CS28
 Close the sea water inlet valve CS27 and outlet valve CS30

Procedure for the Operation of the Backflushing
System on the Main Central Fresh Water Coolers
• c) Sea water will flow into the central cooler via the outlet connection and
will flow out via the inlet connection. Debris on the cooler surfaces will be
dislodged by this counter flow of sea water and will be discharged
overboard.
• d) Leave the backflushing system operating for about 15 minutes and then
open the cooler main sea water inlet and outlet valves and close the
backflushing inlet and outlet valves. Check the sea water flow through the
cooler. The cooler is now back in operation and the other cooler may be
back-flushed. If the cooling load can be maintained during the
backflushing operation, then the backflush operation can be maintained
for as long as is practicable before reverting to the normal flow

Procedure for the Operation of the Fresh
Water Evaporator Sea Water System
a) Ensure that the sea water crossover suction main is
operational as described above.
b) Ensure all the pressure gauge and instrumentation
valves are open and that the instrumentation is
reading correctly.
c) Set up the valves as shown in the following table:
d) Start the fresh water generator ejector pump and
operate the fresh water generator as required.

The Sea Water MGPS Antifouling System
• The sea water system is protected against fouling by the antifouling
system. The system protects against marine growth and corrosion by
means of anodes. The marine growth protection anodes (MG) are made
from copper and the trap corrosion anodes (TC) are made from
aluminium. The anodes are fitted in the suction strainers.
• The port and starboard side strainers each have two MG anodes and two
TC anodes. Anode life is approximately 2.5 years. A low current must be
maintained at the sea suction strainer which is not operating.
• The MG anodes release copper ions when an electric current is applied
and these ions combine with those released from the sea water during
electrolysis. The effect of the ions is to prevent or discourage micro-
organisms from entering the sea water circulation system thus preventing
the breeding of these organisms within the sea water system.
• The TC anodes form aluminium hydroxide when an electric current is
applied. This forms an anti-corrosion barrier on the steel pipework of the
sea water system.

• It is essential that the correct current is always applied to the anodes at
the operating sea water suction chest; too low a current results in
insufficient protection and too high a current results in rapid wasting of
the anodes. The anodes must be checked periodically in order to ensure
that they are wasting at the expected rate. Rapid wasting will result in loss
of protection when the anodes are depleted but the rapid wasting of the
copper anodes can result in high copper deposits on the sea suction
strainer resulting in partial blockage. The design current is for the sea
water flow of 3,000m3/h, if the sea water flow rate is reduced from this
value the current applied to the anodes should also be reduced.
• The current settings for the MG and TC anodes should be the same and
the currents are adjusted by means of the setting knobs on the control
panel. Adjustment of current should only be made after consulting the
Cathelco operating manual. Incorrect setting of the current can result in
inadequate protection against marine growth and corrosion.
• The control panel is located at engine room lower plate level .

• Operating Procedure
a) Turn the main power switch at the control panel to the ON position.
b) Set the anode currents to the desired values by means of the control
knobs, checking the current on the digital ammeter above the control
knob.
• When the vessel is in ‘Blue Water’ the anode life may be extended by
turning the current down to 0.2 A.
• If there is signs of marine growth infestation the current may be increased
by a maximum of 0.2 A, but if no fouling is present the current may be
reduced by a maximum of 0.2 A.
Note: If the ship is in fresh or brackish water the display may not reach the
recommended current value and this may cause the warning LED to
illuminate. This can be ignored as it is the setting in sea water which is
important.

Fresh Water Generator system
• The fresh water generator fitted is able to produce up to 35m3 of fresh
water per day and essentially consists of the following main components:
 Evaporator - The evaporator is a plate type heat exchanger located in the
lower part of the generator and is supplied with sea water (feed) and hot
water from the main engine high temperature cooling system.
 Separator - The separator separates out the brine from the fresh water
vapour produced inside the generator and is located between the
evaporator and condenser sections.
 Condenser - The condenser is located in the upper part of the generator
and condenses the hot vapour into liquid so that it can be easily pumped
to the distilled water storage tanks
 Combined brine/air ejector - The brine and air ejector is driven by sea
water supplied from the fresh water generator ejector pump and is used
to extract spent brine and any condensable gases from inside the
generator casing. In doing this the ejector also produces a vacuum inside
the generator’s casing.

Fresh Water Generator system
 Sea water ejector pump - The fresh water generator ejector pump
supplies the generator with sea water for use in the evaporator and
driving water for the brine/air ejector. The pump is independent of the
generator and takes its suction from the sea water crossover main.
 Fresh water distillate pump - The distillate pump extracts the condensed
fresh water vapour from the condenser and pumps it to the port and
starboard domestic fresh water tanks or the distillate tank.
 Salinometer - The salinometer continually monitors the quality of the
water being produced and directs any out of specification fresh water into
the evaporator eductor.
 Control panel - The control panel is mounted on the fresh water
generator and contains the motor starters, running lights, salinometer,
contacts for remote alarms and controls for starting and stopping the
generator.

Fresh Water Generator Operation
• The fresh water generator is based on two sets of titanium plate heat
exchangers acting as an evaporator (lower section) and condenser (upper
section) respectively with the heat input to the generator being supplied from
the ship’s main engine high temperature cooling system.
• To achieve low temperature evaporation within the generator and so improve
its operating efficiency, the pressure within the evaporator chamber is
reduced. This is achieved using the sea water driven eductor that operates as
a brine eductor on the evaporator casing. The sea water flow initially passes
through the eductor before being directed into the condenser plate stack at
the top of the evaporator. Prior to the sea water entering the eductor a small
branch line is taken of the main, this is used as the feed supply via an orifice
and manually adjusted feed regulating valve into the evaporator. The feed
water entering the evaporator flashes off in response to its lowered boiling
point due to the vacuum conditions. After passing around a deflector plate
and then passing through a demister, the hot water vapour is drawn upwards
into the condensing heat exchanger fitted near the top of the unit. The brine
droplets are separated out in the demister and fall to the bottom of the
evaporator chamber where they are extracted by the combined brine and air
ejector that is driven by the sea water ejector pump.

Fresh Water Generator Operation
• Sea water supplied by the sea water ejector pump condenses the vapour
to form distilled water. This is extracted by the distillate pump and
discharged through a salinometer which monitors the salinity of the fresh
water. In the event that it rises above a preset value, 10ppm, an alarm is
sounded through the local control panel to the engine room alarm system,
the condensate is then directed into the eductor suction line via a
solenoid operated dump valve.
• A flow meter is fitted at the distillate pump discharge to monitor the
amount of fresh water being produced, at full capacity the generator is
capable of producing 35 tonnes of fresh water per day.
• The distillate from the fresh water generator can be discharged to the port
and starboard fresh water tanks via a rehardening filter and silver ion
steriliser. The distillate can also be directed to the distillate tank for use in
the boiler, in this case bypassing the rehardening filter and steriliser unit.
• There is also a connection on the discharge line that allows for filling of
the fresh water generator chemical treatment tank.

Procedure for Starting the Fresh Water Generator
• To operate the fresh water generator, the main engine HT fresh water cooling
system and the main engine must both be operational. The sea water crossover
main must also be operational.
a) A filling valve on one of the fresh water tanks water tank must be opened.
b) Ensure that the fresh water generator control panel is switched on, that instrument
and gauge cocks are open and that all of the instrumentation is reading correctly.
Switching on the fresh water generator also starts the salinometer but by default
the alarm is deactivated for a period of 10 minutes at start up.
c) Add the correct chemical to the chemical treatment dosing tank and dilute to the
correct concentration using fresh water. The fresh water is supplied from the fresh
water generator outlet, this should be done when the fresh water generator is
operating. Alternatively fresh water may be added manually from the domestic
fresh water system by means of a water container.
• Treatment chemical is added to the feed sea water in order to prevent scaling in the
fresh water generator and foaming during evaporation. The flow valve must be
adjusted to give the correct flow rate and this depends upon the treatment
chemical used. The suction effect of the sea water flow draws treatment chemical
into the water flow and so no dosing pump is required.

d) Ensure that the fresh water generator jacket water bypass valve CH10 is open
and that the fresh water generator jacket water inlet valve CH08 and outlet
valve CH09 are closed.
e) The distillate pump outlet valve must be initially closed as must the evaporator
feed water inlet valve
f) Ensure that the fresh water generator ejector pump discharge strainer is clean.
g) Close the air vent valves on the evaporator shell.
h) Set the valves as in the following table:
i) Close the drain valve on the water ejector.
j) Start the sea water ejector pump to create a vacuum inside the fresh water
generator.
k) When the minimum of 90% vacuum has been obtained open the feed water
inlet valve to the evaporator, open the chemical treatment valve and start the
pump, check that the flow rate is correct. The flow rate must be adjusted at the
fresh water generator supply valve to give the dosing rate recommended by the
chemical treatment supplier. The flow meter will indicate the flow rate.

l) Open the fresh water generator jacket cooling water outlet valve and the inlet
valve. The inlet valve should be opened slowly in order to avoid thermal shock.
As the inlet valve is opened the bypass valve should be throttled, insure the
pressure and flow are maintained in the HT circuit.
m) Boiling will commence in the evaporator section and the vacuum will fall to
about 85%.
n) Ensure that the salinometer is operating and that the salinometer alarm level is
set to 10ppm.
o) Allow the evaporator to stabilise ensuring water levels are steady and
temperatures are not excessive. Once evaporation has stabilised check the
salinometer reading by pressing the SETUP pushbutton. Pressing the + or -
pushbuttons at this stage enables the alarm setting to be changed.
p) When fresh water is present in the inspection glass on the suction side of the
distillate pump, start the distillate pump and open the outlet valve from the
distillate pump to the fresh water storage tanks.

• The output capacity is regulated by increasing or decreasing the amount of
main engine jacket water passing through the heat exchanger. Operate the
evaporator jacket water bypass valve to regulate the output capacity, ensuring
that under-cooling does not occur. This should be done gradually over a
prolonged period of time.
• To check that the fresh water generator is operating correctly and that no
fouling has occurred, compare the operating temperatures, pressures and
production with the data supplied in the manufacturer’s manual and adjust the
flow rates and temperatures accordingly.
WARNING
• Do not operate the plant in restricted waters if the water produced is to be
used for human consumption. There are strict regulations governing the
operation of fresh water generators near coasts and estuaries and these
should be observed. Contact the bridge for information regarding these
restrictions when the ship is in coastal waters.
CAUTION
• It is important to note that the fresh water generator must not be operated
without water inside the unit as permanent damage can be caused.

Stopping the Fresh Water Generator Plant
a) Fully open the fresh water generator jacket water bypass valve and then close
the HT outlet and inlet valves, . The valves should be operated slowly to avoid
thermal shock.
b) Stop the chemical feed water treatment, close the supply valve.
c) Stop the distillate pump and close the discharge valve.
d) Press the salinometer ALARM OFF pushbutton to silence the alarm when the
fresh water generator is shut down.
e) Allow the fresh water generator to cool down before stopping the ejector pump,
approximately one hour.
f) Open the vacuum breaker air screw valve.
g) Close the overboard discharge valve and the ejector pump valves .
h) Close the filling valve on the fresh water tank or distilled water tank being filled.
i) Open the water ejector drain valve.
j) Switch off the fresh water generator at the control panel.
Note: Only approved water treatment chemicals must be used and the
recommended concentration must be strictly adhered to at all times.

Chemical Treatment
• During sea water evaporation inside the fresh water generator there is a risk of
scale formation on the heating surfaces that can reduce the efficiency of the
plant resulting in decreased fresh water production.
• It is therefore important that during normal operations, when the evaporator is
working on boiling temperatures above 45°C, that chemical injection into the
feed water system is utilised. The injection unit is filled with chemical diluted
with water in accordance with the chemical supplier’s recommendations. It is
important to ensure that the diluted mix is thoroughly stirred to provide a
homogenous blend of chemicals and water and that it is prepared before it is
required for use. The flow meter from the chemical dosing unit to the feed
water line should be adjusted to cover the maximum fresh water output from
the fresh water generator but the exact quantity is dependent on which
supplier’s chemical is used.
WARNING
Care must be taken when handling feed water treatment chemicals to avoid
direct skin, eye or clothing contact. Approved eye protection and gloves MUST
be worn at all times. In the event of accidental contact, seek medical
attention immediately.

High Temperature Cooling Water System
Main Engine Fresh Water Cooling System
• The main engine high temperature (HT) cooling system has two cooling water
pumps rated at 489m3/h with a pressure of 30mth. The pumps supply cooling
water to the main engine jackets, cylinder heads and exhaust valves.
• The system operates on a closed circuit principle with the pumps discharging
water to the engine cooling system; from the engine the cooling water returns
to the pump suction. Cooling water from the engine outlet may also be
passed through the fresh water generator as the heating medium. Return
water from the fresh water generator is led to the pump suction. A three-way
valve in the return line to the pump suction also has a connection with the
low temperature central cooling system allowing cooler water from the LT
system to flow into the HT system should the temperature at the engine
outlet exceed the set value of 90°C. Water flowing from the LT to the HT
cooling system replaces hotter water from the HT system which flows to the
LT system via valve CH11 which is normally open. Valve CH11 is closed when
warming through the HT system via the preheater.

• High temperature water flowing into the fresh water generator is regulated by the
inlet valve and outlet valves at the fresh water. Between the fresh water generator
inlet and outlet pipes there is a fresh water generator bypass valve which must be
fully open when the fresh water generator is not in use. The fresh water generator is
the only direct means of cooling water circulating in the HT system hence the need for
transfer of water between the HT and LT systems.
• A jacket cooling water preheater is provided, this being steam heated. The preheater
is used when it is necessary to warm through the main engine prior to starting from
cold; normally the main engine will be circulated with water in order to maintain
temperature. The preheater is located between the HT cooling water circulation
pumps and the engine inlet. A valve bypassing the preheater, is throttled to ensure a
flow through the preheater at all times. The preheater maintains the main engine
jacket cooling water temperature when the main engine is at idle or on low load.
• Jacket cooling fresh water is supplied by the circulating pumps to the engine cooling
water inlet pipe and from this it is directed to the individual cylinder units which are
provided with inlet and outlet valves. These valves allow individual cylinder units to be
isolated for maintenance; drains at the cylinder units allow water to be drained to the
jacket water drain tank. Each cylinder unit can be isolated and drained as necessary.

• The upper part of the engine cooling water system is connected to the cooling
water expansion tank by means of a vent pipe, this allowing for expansion in the
system and the venting of air.
• The HT cooling fresh water system is linked to the LT central cooling system by
means of two pipe connections. One of these allows water from the HT system
to flow into the LT central cooling system via CH11, the other allows water from
the LT central cooling system to flow into the HT system, via the temperature
controlled three-way valve. The temperature at the HT cooling water outlet from
the engine is maintained at 90°C, with the three-way valve regulating the flow of
water between the LT and HT systems in order to maintain set point value. The
HT cooling water system is balanced so that any water flowing out is
immediately replaced by water flowing in from the LT system. The LT system
connection to the three-way valve is at the outlet from main engine air coolers.
• When the engine is operating the water entering the main engine jacket HT
cooling fresh water pump suction is a mixture of water from the HT system and
from the LT central cooling system. The actual mixture depends upon the
temperature of the water leaving the main engine and hence the opening of the
three-way valve.

• When preheating the main engine from cold, the system discharge valve to the LT
system CH11 should be closed. This prevents the flow of water between the HT
and LT systems, so assisting the HT system to retain heat during the warming
through period.
• A portion of the circulating cooling water may be directed through the preheater
(the quantity is regulated by means of the bypass valve CH05). The preheater is
normally maintained in operation when the engine is stopped or operating at low
load, it may also be operated in order to ensure sufficient heat is available in the
jacket cooling fresh water for operation of the fresh water generator. The steam
supply to the main engine jacket cooling fresh water preheater is automatically
controlled by a temperature sensor in the inlet line to the main engine.
• The expansion tank provides a positive head to the system as well as allowing for
thermal expansion of the water in the system. The system can be drained to the
jacket water drain tank, which when a unit(s) is being refilled, the water drained
into the jacket water drain tank can be transferred back to the expansion header
tank via the cooling water transfer pump and isolating valve CH33. The expansion
tank can also be replenished using the fresh water hydrophore system. The cooling
water expansion tank is fitted with a local level indicator and a temperature
indicator.

• In order to prevent corrosion, chemical treatment is added to the fresh
cooling water. This treatment is added to the fresh water expansion tank and
is applicable to the HT and LT systems as they both use the same circulating
water. It is essential that the circulating fresh water is tested daily and the
correct chemical treatment is added in order to prevent corrosion in the
cooling water system. A log must be kept of the cooling water tests and the
treatment added.

Preparation for the Operation of the Main Engine
Jacket Cooling Water System
• The description assumes that the system is being started from cold.
a) Ensure that the HT cooling fresh water system is fully charged with water and that
all air is vented from the system. Ensure that the cooling fresh water expansion
tank is at the correct level and top up from the fresh water system if necessary.
b) Ensure that power is available at the three-way control valve and that the valve is
operational.
c) Ensure all the pressure gauge and instrumentation valves are open and that all
instruments and gauges are reading correctly.
d) Ensure that the fresh water generator is bypassed, that valve CH10 is open and the
fresh water generator inlet valve CH08 and outlet valve CH09 are closed.
e) Ensure that all the main engine individual cylinder inlet and outlet valves are open.
f) Ensure that all the main engine individual cylinder vent and drain valves are closed.
g) Ensure that the condensate drain line is open from the jacket water preheater
SE10, that there is a steam supply available and that the steam supply
temperature control valve is operational.
h) Set up the valves as shown in the following table:

Preparation for the Operation of the Main Engine
Jacket Cooling Water System
i) Select and start one main engine jacket HT cooling pump as the duty pump and
set the other as the standby.
• The HT cooling pumps can be started and stopped locally or from the pump
control screen display in the engine control room; at the control screen one of
the pumps is started as the duty pump and another is selected as the standby
pump, the pump display is shown on the next column. The standby pump
starts automatically if the operating pump is unable to maintain pressure for
any reason. A pressure switch on the discharge side of the pumps provides the
start signal for the standby pump. The Local/Remote selector switch for each
pump is located on it’s respective group starter panel (GSP) on the main
switchboard.
• Failure of the running pump or a pressure drop below the cut-in set value will
start the standby pump.

Preparation for the Operation of the Main
Engine Jacket Cooling Water System
j) Vent the system, including all engine cylinders.
k) Supply steam to the preheater via the system steam isolating valve and the
steam control valve, check that condensate flows from the preheater, a
drain valve is fitted at the drain trap.
l) Slowly bring the jacket cooling water temperature up to operating
temperature in line with the engine manufacturers recommendations. The
steam supply control valve is regulated by the temperature of the jacket
cooling water being supplied to the main engine. The normal engine inlet
temperature should be 73°C.
m)As the temperature approaches normal operating temperature, the LT link
valve CH11 should be opened. The HT and LT system are now linked.

Preparation for the Operation of the Main
Engine Jacket Cooling Water System
n) Test the system for chemical concentration daily and add chemicals as
required. The system is connected to the LT central cooling system and so
both systems are tested and treated together.
o) When the jacket system is at the correct temperature and the main engine
has been warmed through for the required period of time, the main
engine may be started provided that all other systems are operational. The
preheater bypass valve CH05 must be throttled in when the main engine is
started.
p) When the engine is at full power, circulate water through the fresh water
generator and operate as required.
Note: When the engine is warmed through from the cold condition
attention must be paid to all pipe connections, joints and valves in order
that any leaks may be quickly detected.

Low temperature Cooling water System
• The low temperature central fresh water cooling system works on the
closed circuit principle; it is linked to the HT main engine jacket cooling
fresh water system but it may be considered as a closed circuit. The
system has the following features:
• Three circulating pumps which supply the services at a rate of 950m3/h and
a pressure of 25mth.
• Pressure switches on the pump discharges which start the standby pump on
low pressure.
• Two central coolers, which are cooled by sea water.
• An expansion tank which provides a positive head to the system, as well as
allowing for thermal expansion. This tank can be topped up from the fresh
water hydrophore system or via the cooling water transfer pump. The
positive head ensures that, in the event of failure at the coolers, fresh
water leaks into the sea water system and sea water does not leak into the
fresh water system. This prevents contamination of the fresh water system
by sea water which could cause corrosion.

• Water in the LT system circulates through individual systems as required in
order to maintain the desired temperatures in those systems. The
pipework is permanently vented from the highest point of the system to
the expansion tank.
• The circulating pumps receive suction from the system return main lines
and discharge water into the outlet main via the fresh water coolers. A
three-way temperature controlled valve at the outlet from the coolers
allows some of the circulating water to bypass the coolers. Water flowing
from the pumps to the LT cooling water distribution manifold is a
combination of water which has passed through the coolers and water
which has bypassed the coolers. The setting of the three-way valve
maintains a water temperature at the distribution manifold of 36°C. Each
of the central fresh water coolers has a capacity of 60% of the total
maximum cooling requirement.

• The LT central cooling system supplies the following:
• Main engine charge air coolers
• Generator engine (No.1, 2 and 3 jacket cooling system and HT charge air
cooler (engine driven circulation pumps); LO cooler, LT charge air cooler
and alternator
• Generator engine nozzle cooling units
• The intermediate shaft bearings (two)
• Main engine LO coolers
• Turbocharger LO cooler
• Stern tube LO cooler
• Steam dump condenser/drain cooler
• No.1, No.2 and No.3 main air compressors
• Accommodation air conditioning units and provision refrigeration units
• No.1 and No.2 engine control room and workshop unit coolers
• Fin stabiliser oil coolers

• Each generator engine is provided with an engine driven cooling water
pump for the HT circuit which covers the cylinders and the HT charge air
cooler. A preheating unit, with an electrically driven pump, is fitted in
order to ensure that the engines may be warmed through before starting.
With one engine operating and the central cooling water system up to
temperature, warm water from the central cooling system will circulate
around the standby generator engines and maintain them in a warm
condition.
• The LT central cooling pumps supply cooling water to the main engine
charge air coolers and to other items of plant.
• The main engine LO coolers are provide with a temperature controlled
threeway bypass valve which maintains the LO temperature at the desired
value of 45°C. This valve diverts some of the cooling the water flow
directly into the outlet line from the LO coolers thus reducing the cooling
effect on the LO circulating through the coolers.

Preparation for the Operation of the Low Temperature
Fresh Water Cooling System
• The description assumes setting up the system for the first time. In
practice the system will normally be operating with at least one generator
engine running and so heated water will be circulating. Generator engine
jacket cooling is part of the low temperature cooling system and so heated
water will be available to the jacket systems of engines on standby. Excess
heat from the operating generator engine(s) and other operating
equipment is removed by sea water circulating through the central
coolers. The generator engine cooling fresh water system is provided with
an electric preheater in order to allow the generator engines to be
warmed through when on shore power prior to starting. The preheater
unit has its own electrically driven circulation pump.
a) Replenish the system from the expansion tank, which is filled from the
fresh water system or the cooling water transfer pump if water is available
in this tank.
b) Ensure all pressure gauge and instrumentation valves are open and that
instruments and gauges are operating correctly.
c) Set up valves as shown in the tables below:

• The description assumes setting up the system for the first time. In
practice the system will normally be operating with at least one generator
engine running and so heated water will be circulating. Generator engine
jacket cooling is part of the low temperature cooling system and so heated
water will be available to the jacket systems of engines on standby. Excess
heat from the operating generator engine(s) and other operating
equipment is removed by sea water circulating through the central
coolers. The generator engine cooling fresh water system is provided with
an electric preheater in order to allow the generator engines to be
warmed through when on shore power prior to starting. The preheater
unit has its own electrically driven circulation pump.
a) Replenish the system from the expansion tank, which is filled from the
fresh water system or the cooling water transfer pump if water is available
in this tank.
b) Ensure all pressure gauge and instrumentation valves are open and that
instruments and gauges are operating correctly.

• Note: System valves in the above table are shown as open but they must be
closed if an item of equipment is being isolated for maintenance.
Operation
a) Start one low temperature cooling fresh water pump. Under normal
circumstances two pumps will be running in Master mode when the operating
load is established and most of the services that can be supplied are on line,
the third pump will be set to Standby.
b) Supply sea water to the central fresh water cooler. Fresh cooling water in the
central cooling system will bypass the central coolers by means of the
temperature controlled three-way valve until the cooling fresh water reaches
the desired temperature.
c) Check the level of chemical treatment and dose as necessary.
d) Start the generator engine preheater and raise the temperature of one or more
generator engine jacket cooling systems. When the temperature is correct the
generator engine can be started. As the generator operates it will supply heated
water to the central cooling system.

e) The central LT cooling system will warm up due to heat supplied by the
generator engine. Other machinery systems may be operated as required.
When the load on the system increases to the point where it is necessary to
start the second pump, bring the second pump on line. Two pumps should now
be running with the third on standby. If the ship has been on shore power, a
number of systems may already be operating at their operating temperature.
When the systems come on line check that the correct temperatures are being
maintained throughout the system and that there are no leaks. Vent as
necessary the sections on the system.
f) When the low temperature central cooling system is operating at the desired
temperature the generator engine preheater unit may be shut down.
g) Check the water condition in the central cooling system on a daily basis and add
treatment chemicals as required.
Note: Chemicals may be added to the cooling water expansion tank via the
hopper at the top of the tank.

Generator Engine Nozzle Cooling System
• Nozzle cooling modules provide cooling for the generator engine fuel
injectors. One nozzle cooling module serves No.1 generator engine and the
other nozzle cooling module serves No.2 and No.3 generator engines. A pump
circulates the nozzle cooling water through a heat exchanger to the engine
fuel injectors. The return is via a sight glass, any FO contamination of the
nozzle cooling water should be observed in this sight glass.
• The heat exchanger which is a sealed type is cooled by water from the LT FW
cooling system. The nozzle cooling water returns to the pump suction; the
complete system is pressurised by a 2.0 bar buffer pre-charged to 1.5 bar.
There is one nozzle cooling pump for each module, make-up water for the
system is supplied to the unit from the LT cooling fresh water system into the
suction side of the pump.
• The nozzle unit control panel has a manual/auto selection switch which when
set to AUTO starts and stops the nozzle cooling pump only when a generator
engine on the system is running. The control panel also has a hours run meter,
manual start and stop pushbuttons, stopped and run indication, indication
lamps for the power source being on and any abnormal fault condition.

Refer Container Fresh water cooling System
• Container cooling fresh water is supplied by a separate fresh water circulation
system which has its own fresh water pumps, coolers, heater, sea water
pumps, expansion tank, chemical dosing plant and steriliser unit. The
expansion tank is supplied with make-up water from the fresh water
hydrophore system and is provided with a low level alarm.
• The coolers are supplied with sea water by means of container cooling sea
water pumps. The container cooling fresh water system operates on demand
from the reefer container system. The container cooling fresh water preheater
maintains a minimum temperature of 3°C in the circulating water system on
return from the reefer containers; this prevents the water freezing in the
pipeline system.
• A three-way temperature controlled valve located in the cooler outlet line
regulates the water flow through the coolers or bypassing the coolers thereby
regulating the temperature of the water being supplied to the reefer
containers. The temperature is maintained at 25°C in the supply line to the
reefer units.

Refer Container Fresh water cooling System
• The steriliser is located between the container cooling water supply and
return lines. The steriliser branch line valves should always be open to ensure
that there is always a flow of water through the steriliser. The steriliser
operates automatically to maintain the water in a sterile condition.
• A pressure control valve is fitted to maintain the pressure in the reefer water
circuits within acceptable limits; the valve is set to a pressure of 5.0 bar. This
valve bypasses the reefer circuit and passes water from the delivery to the
return lines.
• A chemical dosing tank located adjacent to the expansion tank is provided to
allow the introduction of corrosion inhibiting chemicals to the cooling water
system. The tank is isolated from the system, a charge of chemicals is put in
the tank and then the supply and return valves are opened so that the
chemical is discharged into the circulation system.
Note: On the vessel, the chemical dosing tank does not have isolation valve
fitted, the supply from the pump, therefore the dosing tank is always under
pressure.

Procedure for Operating the Reefer Container
a) Check that the container cooling fresh water expansion tank is at the
correct level and top up as necessary. This is achieved by means of the
filling valve from the fresh water hydrophore system.
b) Check all instrumentation on the system and ensure that it is operational
and reads correctly.
c) Ensure that the inlet and outlet valves for the holds are open and that the
supply and return valves for each tier of containers are also open.
d) Supply sea water to the container cooling fresh water coolers
Note: Each tier of containers has a supply and return manifold with inlet and
outlet cooling water valves at the pipe connections to the container hoses.
The manifold valves must be open when a reefer container is operational.

f) Select one of the container cooling fresh water pumps as the duty pump
and the others as standby pumps. The number of pumps required will
depend upon the cooling requirement which is determined by the
number of reefer containers on board. Each pump and cooler is rated as
50% of the total reefer load, therefore the pump and cooler
requirements will be determined by the reefer load being carried.
g) Start the duty pump and check that water is circulating around the
container cooling fresh water system and that the correct temperature is
being maintained.
h) Start the steriliser unit and ensure that it is operating correctly.
i) Open the heater steam supply and drain valves and ensure that the
temperature control valves are operating for the steam supply and
cooler bypass as required.
j) Open the supply and return valves at the reefer containers as required and
check their operation.

k) Check that the container cooling fresh water system is being maintained at
the correct temperature and that there are no leaks.
l) Test the concentration of corrosion inhibiting chemical level in the
circulating water each day and operate the dosing unit to add treatment
chemicals as necessary.

Main Engine Fuel Oil Service System
• The main and diesel generator engines are intended to burn HFO at all times.
Such fuel normally has a viscosity of up to 700cSt at 50°C and this is too high
for effective atomisation and combustion. A viscosity at the fuel injectors of
between 13 and 17cSt is needed for effective engine operation therefore the
fuel must be heated before it is delivered to the engine fuel injection system.
The temperature to which it is heated depends upon the initial viscosity of the
fuel. A viscosity-temperature chart is provided so that the heating temperature
can be determined for any fuel of known viscosity. The viscosity controller
monitors viscosity directly and adjusts the heating accordingly so there should
be no need for the engineer to intervene. However, knowing what the heating
temperature should be allows the engineer to check the functioning of the
viscosity controller and enables manual intervention, should the viscosity
controller malfunction.
• Heavy fuel oil is stored on board in four HFO storage tanks, one of these being
dedicated to low sulphur HFO. There are separate HFO and low sulphur heavy
fuel oil (LSHFO) settling and service tanks. Under normal circumstances the
main engine and generator engines operate continuously on HFO but when
environmental circumstances dictate the fuel oil supply system is changed over
to LSHFO operation.

• Fuel oil (HFO or LSHFO) is transferred from the storage tank(s) to the
associated settling tank by means of the HFO transfer pump and from the
settling tank the fuel oil is passed through a centrifugal separator before
discharge to the associated service tank. There is one HFO transfer pump and
one MDO transfer pump; a crossover pipe system, fitted with blanks, allows
either pump to be used for HFO or MDO as required. The HFO and MDO
transfer pumps are normally used to transfer fuel oil from the storage to the
settling tanks (MDO service tank in the case of MDO) but they may be used to
transfer HFO between the storage tanks (if necessary) in order to maintain the
trim and stability of the vessel.
• There are three centrifugal separators which are used to process HFO and fill
the appropriate HFO service tank. Each separator has its own feed pump but
cross connection valves allow the pumps to be used with any separator.
Centrifugal separator No.3 may also be used for diesel oil and it is generally set
up for this operation.

• At least one of the HFO separators will normally be running at all times, with
the throughput balanced to match the fuel consumption of the main and
generator engines and the auxiliary boiler. In an emergency the main engine
and can be changed over to diesel oil operation, in this case the generator
engines will also have to run on MDO. The three diesel generator engines
normally operate on HFO, the supply being taken from the fuel oil preparation
unit which also supplies the main engine, although they (one or and
combination) can be run on MDO independently from the main engine FO
supply. Flow meters in the diesel generator engine fuel supply and return lines
enable the fuel consumption of the diesel generator engines to be determined.
A flow meter in the fuel oil preparation unit after the FO supply pumps enables
the total fuel consumption to be calculated for the main engine and generator
engines.
• The boiler HFO supply is taken from the service tanks and supplied to the
burner unit via the boiler FO pumps and a heater. The boiler may also burn
MDO from the MDO service tank and waste sludge oil from the clarified oil
boiler tank or the sludge preparation tank. The boiler pilot burner operates on
diesel oil.

• Outlet valves from all fuel tanks are of the quick-closing type with a collapsible
bridge which can be operated from the fire control station on A deck. After being
tripped from the fire control station the valves must be reset locally. The FO service
and settling tanks are also fitted with a self-closing test cocks to test for the
presence of water and to drain any water present. Tundishes under the self-closing
test cock drain any test liquid to the waste oil tank. All tanks and heaters are
supplied with steam at 7kg/cm² from the ship’s steam supply, with condensate
flowing to the drain cooler and then into the observation tank before passing into
the cascade tank, the observation tank is fitted with an oil detection unit.
• The steam supply to both fuel oil preparation unit heaters is controlled by a
viscosity controller. All fuel oil pipework is trace heated by small bore steam pipes
laid adjacent to the fuel oil pipe and encased in the same lagging.
• Heated and filtered fuel oil is supplied to the main engine from the HFO service
tank, or the LSHFO service tank if operating on low sulphur fuel. However, it is
possible to run the main engine on MDO should that be necessary. There are
supply valves to the fuel oil preparation unit from the HFO service tanks and the
MDO service tanks, in normal operations the valve from the HFO service tanks is
open and the valve from the MDO service tank is closed. In order to change to
operation on MDO the valve from the MDO service tank is opened and the three-
way valve is changed over from the HFO service tanks to the MDO service tank.

• Heavy fuel oil from the HFO service tank, or LSHFO service tank, is supplied to one
of two low pressure fuel oil supply pumps. The second pump will be on automatic
standby and will start in the event of discharge pressure drop or voltage failure of
the running pump. A suction filter is located immediately before each low
pressure FO supply pump, an automatic backflushing filter set (15μm) with a
manual bypass filter is located directly after the FO supply pumps. A fuel
flowmeter is located at the outlet from the low pressure FO supply pumps and
automatic filter unit. A pressure regulating valve, set at a pressure of 5.0kg/cm2 is
located after the FO supply pumps, this returns released FO back to the pump
suction.
• The low pressure FO supply pumps discharge through the flowmeter to the fuel
mixing unit from which the FO circulation pumps take suction. There is also a
connection to the fuel mixing unit from the main engine and generator engine
return fuel lines. Valve FM32 connects the return FO line to the fuel mixing unit,
this return line is also provided with an automatic regulating valve from the main
engine FO supply line, set at 10.0kg/cm2. If necessary the FO return can be
directed back to the FO service tank via FM33, in normal operations is valve is
kept shut, it is necessary to use this return line then the appropriate inlet valve to
the HFO or LSHFO service tank must be open.

• Heavy fuel oil is drawn from the fuel mixing unit into the operating FO circulating
pump which discharges to the FO heaters and viscosity testing and control unit.
The second FO circulating pump will be selected for automatic standby and will
start in the event of discharge pressure drop or voltage failure of the running
pump. The fuel oil circulating pump discharges through a pair of main engine fuel
oil heaters where the oil is heated to a temperature corresponding to a viscosity
of 12cSt using steam at a pressure of 7kg/cm² A viscosity controller is located in
the fuel line after the heaters and is used to regulate the steam supply to the
heaters in order to maintain the correct fuel viscosity. The viscosity measuring
device can be bypassed if necessary. Normally only one of the fuel oil heaters is
required in order to maintain the HFO at the desired viscosity.
• The heated FO passes through a final filter (35μm) to the main engine fuel rail
which supplies the common rail fuel pumps. The inlet line to the engine fuel
system, which is provided with a pressure regulating valve, connects the engine
fuel supply line with the outlet fuel line from the engine. This valve is set at a
pressure of 8kg/cm2 and it regulates the pressure at the inlet to the main engine
fuel pumps, diverting excess oil to the HFO outlet line from the engine to the fuel
oil mixing unit.

• The main engine operates on the common rail fuel system with a number of
engine driven high pressure fuel pumps pressurising the fuel rail. From the
common fuel rail the high pressure fuel is directed to the cylinder injectors via the
volumetric fuel control unit.
• Fuel is supplied to the cylinder fuel injectors with the correct timing and in the
correct amount to allow the cylinders to develop the desired power. There is no
circulation of fuel through the fuel injectors but fuel is released at the fuel rail
pressurisation pumps and the common fuel rail; this ensures circulation of fuel
and maintains the common fuel rail at the correct temperature at all times. The
released fuel flows back to the FO mixing unit in the fuel preparation unit.
• The high pressure fuel pump lines, the common fuel rail and the high pressure
fuel injector pipes on the engine, between the common rail and the injectors, are
sheathed; any leakage from the annular spaces formed between the sheathing
and the high pressure pipe is led to an alarmed leakage tank and then to the fuel
oil drain tank.
• The generator engine HFO supply is taken at the outlet from the fuel preparation
unit before the final filter. The FO return line from the generator engines joins the
main engine fuel return system between the main engine outlet and the fuel
mixing unit.

CAUTION
• Care must always be exercised when dealing with fuel oil and the overheating of
HFO and MDO in the service tanks and the fuel system must be avoided.
• Note: The main and generator engines are normally operated continuously on
HFO. The fuel preparation unit supplies the main and generator engines and so if
the fuel supply to the fuel preparation unit is changed to MDO or LSHFO the main
and generator engines will be supplied with the same fuel.
• Note: If circumstances require a change to low sulphur fuel consideration must
be given to changing the main engine cylinder lubricant. Normally the cylinder
lubricating oil has a high alkalinity in order to neutralise the acid products of
combustion. If the engine fuel is changed to one with a very low sulphur content
(below about 1.5%) the high alkaline additive in the cylinder oil can result in
deposits on the cylinder line which can cause damage to the line and piston rings.
The engine builder and cylinder lubricant supplier must be consulted for advice
on cylinder lubrication if the main engine is to operate for prolonged periods on
very low sulphur fuel.

Procedure for Preparing the Main Engine Fuel
Oil Service System for Operation
• It should be remembered that the main engine and the generator engines normally
operate on HFO at all times and they use the same HFO system. A change to MDO can
be made for reasons given below and either the entire fuel system or the generator
engine fuel system is changed to MDO operation for normal use. It is possible to
change just one generator engine to MDO operation, this would for example be done
prior to shutting down for major maintenance. A ‘port’ generator engine MDO pump
is provided to flush MDO through a generator(s) engine’s fuel system and supply MDO
to the generator engines separately from the main fuel preparation unit. There are
separate HFO and MDO supply and return lines for all generator engines. The MDO
supply line has a pressure relief valve which operates at a pressure of 4.0kg/cm2
returning back to the MDO service tank.
• The following procedure illustrates starting from cold, with the entire fuel system
charged with MDO and in a shut down condition. This will only occur during dry-
docking when shore power is used; the generator engines would then be flushed
through with MDO and would need to be changed to HFO operation when the main
fuel system is changed to HFO. The main engine is to be started on MDO and be
changed over to HFO operation when running. Changing to HFO operation should take
place when the main engine is operating below 75% of MCR and this power should be
maintained until the fuel temperature has stabilised at the correct value.

a) Start one of the HFO separators and fill the HFO service tank/ LSHFO service tank from the
appropriate FO settling tank. Ensure that the MDO service tank has sufficient fuel for
operating the main engine and generator engines, replenish this tank if required.
b) Ensure that the filters are clean.
c) Ensure that the HFO service tank/LSHFO service tank is heated to the desired temperature
and that trace heating steam is available at the HFO lines. A steam supply must be available
for tank and trace heating.
d) Ensure that all instrumentation valves are open and that all instruments and gauges are
reading correctly.
• The main engine is supplied with MDO from the MDO service tank via tank quick-closing
valve FM59EV, line non-return valve FM65 and three-way supply valve FM03
• The generator engines will be operating on MDO which is supplied by the fuel preparation
unit or the ‘port’ generator engine MDO pump. When the fuel oil preparation unit is
operating it may also be used to supply MDO to the generator engines. However, when the
fuel oil preparation unit is changed to HFO the generator engines will be supplied with HFO
and this can cause instability in power generation and electrical supply due to changes in
fuel temperature. In order to avoid this the generator engines should be supplied with MDO
by the ‘port’ generator engine MDO pump until the main engine is operating satisfactorily
on HFO.

• Individual generator engines can be changed to HFO operation off load . The ‘port’
generator engine MDO pump suction valve FM60 and discharge valve FM62 are
normally left open but the recirculation line valve back to the MDO service tank
FM63 is normally closed.
f) Check that there is sufficient HFO in the HFO service tank and that the fuel in the
tank has been heated to the correct temperature.
g) Select and start the duty FO supply pump and the duty high pressure FO circulating
pump.
• The FO circulating and supply pumps can be started and stopped locally or from the
pump control screen display in the engine control room. The standby pump starts
automatically if the operating pump is unable to maintain pressure for any reason.
A pressure switch on the discharge side of the pumps provides the start signal for
the standby pump. The Local/ Remote selector switch for each pump is located on
it’s respective group starter panel (GSP) on the main switchboard.

• Failure of the running pump or a pressure drop below the cut-in set value will start the
standby pump.
h) Start and run the main engine on MDO and ensure that it operates correctly. When the
time has come to change over to HFO operation and the engine is operating steadily at
below 75% MCR, proceed as follows.
i) Open the engine HFO line trace heating steam and drain valves together with the steam
supply and drain valves for the fuel heaters.
j) Check that the trace heating lines are warm and that the HFO in the HFO service tank is at
the correct temperature.
k) Check that the HFO service tank quick-closing outlet valve FM01EV is open (this will
normally be open when it is permitted to burn HFO as the tank valve also supplies the
auxiliary boiler). Turn the three-way fuel supply valve FM03 so that the FO supply pumps
take suction from the HFO service tank rather than the MDO service tank. Heated HFO
will be drawn from the HFO service tank and will flow through the system. It will be
mixed with returning MDO flowing back to the fuel mixing unit, the viscosity controller
will monitor the mixture and adjust the steam supply to the heater in order to obtain the
correct viscosity.

l) Monitor the engine operation for any abnormal conditions. The engine conditions will
fluctuate slightly during the transition phase from MDO to HFO operation and exhaust
temperatures and speed will vary slightly.
m) Gradually all MDO in the return line and the fuel mixing unit will be used and the engine will
be operating on HFO with the viscosity controller maintaining the correct fuel viscosity. The
time taken for all of the MDO to be displaced depends upon the engine’s fuel consumption
but all MDO in the engine fuel supply system should have been used in about 15 minutes.
n) When the engine is running under stable conditions on HFO, the load may be increased
above 75% MCR to the desired value.
o) The outlet quick-closing valve FM59EV from the MDO service tank must be left open as MDO
is supplied to the generator engines via the ‘port’ generator engine MDO pump. The
nonreturn line valve (FM65) from the MDO service tank to the fuel preparation unit three-
way supply valve should be closed.
p) The main engine is now operating on HFO.
Note: The main engine is designed to run and manoeuvre on HFO and the change to MDO
operation should only be made if the fuel system is to be flushed through for maintenance
work, or when the plant is to be switched off for prolonged periods or for environmental
reasons.

Note: It is assumed that the HFO service tank is to be used and return oil will pass to this tank
when the change is made to HFO operation.
CAUTION
Trace heating should not be applied to sections of pipeline isolated by any closed valves on the
fuel oil side as damage could occur due to the restricted expansion of the contents.
• As the main engine and the generator engines take fuel from the same fuel preparation unit,
changing from HFO to MDO or vice versa will cause both engine systems to operate on the
same fuel. The main engine and generator engines are designed to run on HFO at all times.
However, changeover to MDO can become necessary if, for instance, an engine in question is
expected to have a prolonged inactive period due to major repairs of the fuel oil system etc,
or a dry-docking resulting in a prolonged stoppage of the main engine. Additionally,
environmental legislation may require the use of low sulphur fuels. If there is a need to
change the main and generator engines to LSHFO or MDO for environmental or other
reasons, the entire fuel system may be charged with LSHFO or MDO.

Procedure for Changing the Entire Fuel System to Low Sulphur
Heavy Fuel Oil Operation from Heavy Fuel Oil Operation whilst
the Engine is Running
• A change from HFO to LSHFO may be made at any time whilst the engine is
running without any special precautions as the LSHFO has similar heating
requirements as the HFO. Under normal circumstances a changeover to
LSHFO will be made before the vessel arrives at the environmentally sensitive
region and a change from LSHFO to HFO operation will be made when the
vessel is at sea moving away from the environmentally sensitive region.
a) Ensure that the main engine is operating under stable conditions and that the
HFO and LSHFO service tanks have sufficient fuel for prolonged operation of
the main and generator engines and the auxiliary boiler.
b) Ensure that the fuel tanks are at the correct temperature, that all trace heating
is satisfactory and that the fuel preparation unit is operating correctly.
c) Open the quick-closing outlet valve from the LSHFO service tank FM02EV. Close
the quick-closing outlet valve from the HFO service tank FM01EV. LSHFO will
be supplied to the fuel preparation unit and will gradually replace all of the
HFO in the fuel system. The main and generator engines will then operate on
LSHFO.

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