P&ID is a basic engineering document that indicates process requirements, equipment, piping, and instrumentation and logic relations. It should show all lines, flows, equipment, piping components, instrumentation for controlling and monitoring processes, and other details needed for maintenance, operation, commissioning, and start-up. A P&ID is used for engineering, planning, and documentation throughout the project lifecycle. The development process involves iterations with comments and verification.

2. What is P&ID
Basic Engineering document
Indicating -Process Requirement
-Equipment in the Plant
-Piping and Piping Component -
Instrument and Logic Relations

3. What should be indicated on P&ID?
Process requirement
- PFD : all line and flow, every item
- not on PFD : relieving system, pump minimum flow,
compressor anti surge flow, isolation system
- item for maintenance, operation, pre-commissioning,
commissioning, start-up

4. What should be indicated on P&ID?
Equipment
- all equipment with exact number and components :
all nozzles, manholes, internals
- type of connection to piping
- equipment item number, service name, major
specification

5. What should be indicated on P&ID?
Piping
- all lines for normal operation, startup, shutdown,
emergency, special operation, and maintenance
- all piping components (valves etc.) and
notes on them (CSO, CSC, TSO)
- line information : line no., size, fluid symbol,
piping service class, insulation
- configuration requirement : No Pockets, Free Draining

6. What should be indicated on P&ID?
Instrumentation
- instrumentation for controlling, monitoring, emergency shutdown,
sequence control, interlock, automatic start/stop
- field instrument
- control and shutdown valves with their type, size, failure status
- pressure relief valves with their set pressure and size
- kind of signal : pneumatic, electric, hydraulic, capillary tubing,
softlink

7. What should be indicated on P&ID?
Other
- battery limit between client and contractor
- area battery limit
- change of responsibility between Piping and Instrument,
Contractor and Vendor
- extent of packaged equipment supply
- breaks of line information :
line number, piping service class, insulation

8. What information can you get?
For Equipment
Outline/Internals
For Piping Line
No./Size/Material/Insulation/Line
Configuration/Piping Component Type
For Instrument Tag
No./Function/Control Method

9. P&ID is used for
Detail Engineering of each disciplines
Piping layout/Material Purchase
Instrument Logic/DCS Plan, etc
Planning of Construction/Commissioning/Plant
Operation/Maintenance

10. P&ID
IFA
How to Develop/Finalize
Process
Verification
Proj.Spec
Discipline
Comments
P&ID
IFH
P&ID
IFC
P&ID
As
Built
Company
Comments
HAZOP
SIL Study, etc.
Detail Design
Feedback
Vendor Data
Input
Field Change
Feedback

14. P&ID Symbols

18. P&ID Practices

19. Control valve loop
1
FC
4” 300#
PC
005
PY
005
PV
005
I/P
H
L
PT
005
4”

20. LT/FT Cascade Control
FC
4” 300#
FV
102
4”
6”-PL-10042-AA11-N
FT
102
FE
102
300#
LT
105
DISP
SP
LI
105
H
L
FC
102
6”-PL-10042-AA11-N

21. Split range control(1)
1
H
L
PT
001
I/P
8”-PG-10043-AA11-N
FC/TSO
4” 300#
PY
001D
PV
001B
I/P
6”-PG-10042-BA21-N
FC
4” 300#
PY
001C
PV
001A
a
2xa
2x(a-50)
0 100
PIC OUTPUT
100
0
A B
CVOPENING
6”
6”-PG-10043-BA21-N
6”
4”
PY
001A
PY
001B
P
PC
001

22. Split range control(2)
1
2”-PG-10102-AA11-N
I/P
3”-PG-10101-AA11-N
1-1/2”
PY
001D
PY
001A
a
2x(50-a) 2x(a-50)
0 100
PIC OUTPUT
100
0
A B
CVOPENING
I/P
FC
1”
PY
001C
PV
001A
PC
001
AH
AL
PT
001
FC
PV
001B
2”
3”
1-1/2”
2”
PY
001B

23. Place equipment and its components
Connect main piping
Complete control valve loop
Place other instrument and connect signals
Indicate safety devices incl. alarm
Place piping components (Valve/Fitting) as
required
Check detail and add items required incl.
vent/drain connection