1.
Centrifugal
Compressor
OR
Impeller Compressor
OR
Radial Compressor

2.
What is Centrifugal compressor?
• It is a machine in which a gas or vapor is compressed by a radial acceleration by
an impeller
• Principle:-
A centrifugal compressor imparts kinetic energy into the airstream by
increasing the velocity of the air using a rotating element and then converts
this kinetic energy into potential energy in the form of pressure

3.
CONSTRUCTION
A centrifugal compressor
generally consists of four
components
1) Inlet
2) Impeller
3)Diffusor and
4) Collector.

4.
TYPES OF
CENTRIFUGAL
COMPRESSOR
● Single stage compressor
● Multistage compressor

5.
Single stage
compressor
Types of Single stage compressor
- Overhung Single Stage Centrifugal Compressor
- Between bearing design single stage compressors
- Integrally geared single stage compressors

6.
Overhung Single
Stage
Centrifugal
Compressor
● Located at the non-drive end of
the shaft
● These type of compressors have
axial flow suction nozzle
● Mainly designed for low
pressure, high volume application
● It can handle Gas flows up to
60,000 m³/hr and pressure ratio up
to 3.5 can be achieved

7.
Between bearing
design single stage
compressors
● The impeller is mounted
between the bearings
● The impellers are semi open
type
● It can handle Gas flows up to
40,000 m³/hr, pressure ratio up to
1.45 and discharge pressure up to
2 bar can be achieved

8.
Integrally
geared single
stage
compressors
● These have overhung semi open
impellers
● Impeller is overhung mounted
directly onto the high-speed shaft
of gearbox
● It can handle Gas flows up to
300,000 m³/hr, pressure ratio up to
3.5 and discharge pressure up to 50
bar can be achieved

9.
Multistage
compressor
1. Horizontally split casing compressors
2. Vertically split casing compressors
3. Compressors with bell casing
4. Pipeline compressor
5. Integrally geared compressors

10.
Horizontally
split casing
compressor
● Cylindrical casing is divided
into two halves joined along the
center line by bolting
● It is used where the gas
operating pressure is less than
60 bars (870 psi)
● In these types the advantage
is maintenance of internal items
can be done by only removing
the upper half

11.
Vertically split
casing
compressors
● Vertically split casings are formed
by a cylinder closed by two end
covers referred as barrel
● The advantage of the vertically
split joint is its high-pressure
capability due to the one-piece
construction and conventional,
proven flange type seals at each end.
● These machines which are
generally multistage are used for
high pressure services up to 680 bar
(9900 psi).

12.
Compressor with
bell casing
● Used for high pressures
● These have bell shaped
casings and are closed with
shear rings instead of
bolts.

13.
Pipeline
compressor
● These have bell-shaped casings with
a single vertical end cover
● They are generally used for natural
gas transportation
● They normally have side suction
and delivery nozzles positioned
opposite each other to facilitate
installation on gas pipelines
● These are generally designed for
pressure up to 100 bar (1400psi)

14.
Integrally geared
multistage
compressors
● These are used either for low-flow/high
pressure, or high-flow/low pressure
conditions
● This type of compressor has a bull gear
and from one to four high speed pinions.
One or two impellers can be mounted on
each pinion-shaft
● Optimal impeller speed and the ability
to inter-cool compression stages
guarantee very high efficiency

15.
Advantages
• When compared to other compressors, it is relatively agile and easy to
manufacturer.
• As this compressor does not require any special foundation it is highly energy
efficient and reliable.
• They consist of a small number of rubbing parts and are absolutely oil free in
nature.
• It generates a higher pressure ratio per stage than the axial flow compressor

16.
Disadvantages
• They produce a limited amount of pressure and are not suitable for very high
compression.
• As they work at relatively high speed an enlightened or worldly mounting is
required.
• They are very sensitive towards problems such as stalling and choking

17.
THANK YOU