What is P & ID?
P&ID stands for “process and instrumentation diagram,” and it is a detailed graphic representation of a process that also includes the hardware and software required to design, construct, and control the facility. This representation is applicable in the Process Industry Practices (PIP).
Valve PID Symbol:
Line PID Symbol:
SYMBOL | FUNCTION |
---|
| Future Equipment |
| Major Process |
| Minor Process |
| Pneumatic Signal |
| Hydraulic Signal |
| Capillary Tubing |
| Mechanical Link Signal |
| Electromagnetic, Sonic, Optical, Nuclear Signal |
| Electric Signal |
| Connecting Line |
| Non-Connecting Line |
| Non-Connecting Line |
| Jacketed or Double Containment |
| Data or Software Link |
| Self Contained Regulator |
Instrument PID Symbol:
CIRCLE AND LETTERS REPRESENTATION | FUNCTION |
---|
| A circle with letters represents a field or locally mounted instrument |
A | Analysis |
B | Burner |
C | Combustion |
D | Differential |
E | Voltage |
F | Flow Rate |
G | User Choice’s (1) |
H | Hard |
I | Current |
J | Power |
K | Time, Time Schedule |
L | Level |
M | Momentary |
N | User Choice’s (1) |
O | User Choice’s (1) |
P | Pressure, Vacuum |
Q | Quantity |
R | Radiation |
S | Speed, Frequency |
T | Temperature |
U | Multi-variable |
V | Vibration |
W | Weight, Force |
X | Unclassified |
Y | State or Presence |
Z | Position, Dimension |
FC | Flow Controller |
FE | Flow Element |
FI | Flow Indicator |
FT | Flow Transmitter |
FS | Flow Switch |
FIC | Flow Indicating Controller |
FCV | Flow Control Valve |
FRC | Flow Recording Controller |
LC | Level Controller |
LG | Level Gauge |
LR | Level Recorder |
LT | Level Transmitter |
LS | Level Switch |
LIC | Level Indicating Controller |
LCV | Level Control Valve |
LRC | Level Recording Controller |
PC | Pressure Controller |
PG | Pressure Gauge |
PI | Pressure Indictor |
PR | Pressure Recorder |
PS | Pressure Switch |
PT | Pressure Transmitter |
PIC | Pressure Indicating Controller |
PCV | Pressure Control Valve |
PRC | Pressure Recording Controller |
PDI | Pressure Differential Indicator |
PDR | Pressure Differential Recorder |
PDS | Pressure Differential Switch |
PDT | Pressure Differential Transmitter |
PTD | Pressure Transducer |
TC | Temperature Controller |
TE | Temperature Element |
TR | Temperature Recorder |
TS | Temperature Switch |
TT | Temperature Transmitter |
TI | Temperature Indicator |
Mechanical PID Symbol:
SYMBOL | FUNCTION |
---|
| Heater |
| Vessel or Reactor |
| Heat Exchanger |
| Pipe |
| Pump |
| Flow Direction of Pump |
| Boiler |
| Centrifugee |
| Cylinder or Horizontal Tank |
| Liquid Mixer |
| Reaction Chamber |
| Distillation Column |
| Absorber |
| Stripper |
| Diesel Motor |
| Agitator or Mixer |
| Liquid Flow rate |
| Gas Flow rate |
| Crossflow Cooling Tower |
| Chimney Cooling Tower |
| Fan |
Pump PID Symbol:
SYMBOL | FUNCTION |
---|
| Centrifugal Pump |
| Horizontal Pump |
| Vertical Pump |
| Sump Pump |
| Positive Displacement Pump |
| Progressive Cavity Pump |
| Screw Pump |
| Vacuum Pump |
| Reciprocating Pump |
| Positive Displacement Pump |
| Gear Pump |
| Vertical Can Pump |
Compressor PID Symbol:
SYMBOL | FUNCTION |
---|
| Centrifugal Compressor |
| Centrifugal Blower |
| Turbine Driven Centrifugal Compressor |
| Axial Compressor |
| Reciprocating Compressor |
| Rotary Compressor |
| Rotary Compressor & Silencer |
| Liquid Ring Vacuum |
| Rotary Screw Compressor |
| Positive Displacement Blower |
Pipe PID Symbol:
SYMBOL | FUNCTION |
---|
| Generic Pipe |
| Threaded Pipe |
| Socket Welded Pipe |
| Flanged Pipe |
| Heat/Cool Traced Pipe |
| Direct Welded Pipe |
HEAT Exchanger PID Symbol:
SYMBOL | FUNCTION |
---|
| Plate and Frame Heat Exchanger |
| Hairpin Exchanger |
| Air Cooled Exchanger |
| U-Tube Heat Exchanger |
| Double-Pipe Heat Exchanger |
| Single Pass Heat Exchanger |
| Spiral Heat Exchanger |
| Reboiler |
| Heater |
| Condenser |
| Shell and Tube Heat Exchanger |
Function PID Symbol:
SYMBOL | FUNCTION |
---|
| Field |
| Control Panel |
| DCS |
| PLC |
Actuator PID Symbol:
SYMBOL | FUNCTION |
---|
| Manual Actuator |
| Spring Diaphragm Actuator |
| Linear Piston Pneumatic Actuator |
| Rotary Piston Pneumatic Actuator |
| Rotary Motor Actuator |
Positioner PID Symbol:
SYMBOL | FUNCTION |
---|
| Positoner |
| Fail Positioner |
| Manual Override Positioner |