P&ID

P & ID Symbols

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 P & ID Symbol:

SYMBOLFUNCTION
Valve
Gate Valve
Globe Valve
Ball Valve
Check Valve
Butterfly Valve
Diaphragm Valve
Relief Valve
Needle Valve
3-Way Valve
Angle Valve
Four Way Valve
One Way Valve
Solenoid or Binary Valve
Angular Valve
Plug Valve
Bleeder Valve
Orifice
Pressure Safety Valve
NRV Valve
Solenoid Valve
Motor

Line P & ID Symbol:

SYMBOLFUNCTION
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 P & ID Symbol:

CIRCLE AND LETTERS REPRESENTATIONFUNCTION
A circle with letters represents a field or locally mounted instrument
AAnalysis
BBurner
CCombustion
DDifferential
EVoltage
FFlow Rate
GUser Choice’s (1)
HHard
ICurrent
JPower
KTime, Time Schedule
LLevel
MMomentary
NUser Choice’s (1)
OUser Choice’s (1)
PPressure, Vacuum
QQuantity
RRadiation
SSpeed, Frequency
TTemperature
UMulti-variable
VVibration
WWeight, Force
XUnclassified
YState or Presence
ZPosition, Dimension
FCFlow Controller
FEFlow Element
FIFlow Indicator
FTFlow Transmitter
FSFlow Switch
FICFlow Indicating Controller
FCVFlow Control Valve
FRCFlow Recording Controller
LCLevel Controller
LGLevel Gauge
LRLevel Recorder
LTLevel Transmitter
LSLevel Switch
LICLevel Indicating Controller
LCVLevel Control Valve
LRCLevel Recording Controller
PCPressure Controller
PGPressure Gauge
PIPressure Indictor
PRPressure Recorder
PSPressure Switch
PTPressure Transmitter
PICPressure Indicating Controller
PCVPressure Control Valve
PRCPressure Recording Controller
PDIPressure Differential Indicator
PDRPressure Differential Recorder
PDSPressure Differential Switch
PDTPressure Differential Transmitter
PTDPressure Transducer
TCTemperature Controller
TETemperature Element
TRTemperature Recorder
TSTemperature Switch
TTTemperature Transmitter
TITemperature Indicator

Mechanical P & ID Symbol:

SYMBOLFUNCTION
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 P & ID Symbol:

SYMBOLFUNCTION
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 P & ID Symbol:

SYMBOLFUNCTION
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 P& ID Symbol:

SYMBOLFUNCTION
Generic Pipe
Threaded Pipe
Socket Welded Pipe
Flanged Pipe
Heat/Cool Traced Pipe
Direct Welded Pipe

HEAT Exchanger P& ID Symbol:

SYMBOLFUNCTION
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 P & ID Symbol:

SYMBOLFUNCTION
Field
Control Panel
DCS
PLC

Actuator P& ID Symbol:

SYMBOLFUNCTION
Manual Actuator
Spring Diaphragm Actuator
Linear Piston Pneumatic Actuator
Rotary Piston Pneumatic Actuator
Rotary Motor Actuator

Positioner P & ID Symbol:

SYMBOLFUNCTION
Positoner
Fail Positioner
Manual Override Positioner

Related posts

P&ID legends

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Common Terms Used to describe P&ID Drawings

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Instrument Abbreviations used in P&ID Diagrams

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