Piping and Instrumentation Diagrams (P&IDs) are the heart of the process industry, providing a visual representation of systems and activities.
Understanding P&ID codes is important for efficiency and safety while developing, maintaining, or troubleshooting systems.
Here’s a more complete collection of P&ID codes to sharpen up your knowledge.
Pipes & Lines
G-Gas
W - Water
S - Steam
D - Drain
A - Air
V - Vent
O-Oil
P- Process
C- Chemical
H - Hydraulic
I- Instrument Air
Valves
GV-Gate Valve
BV - Ball Valve
CV - Control Valve
SV - Safety Valve
PV - Pressure Relief Valve
FV - Flow Control Valve
TV - Temperature Control Valve
LV - Level Control Valve
XV - On/Off Isolation Valve
DV - Drain Valve
HV- Hand Valve
NRV - Non-Return Valve (Check Valve)
VLV - General Valve Symbol
Instruments
PT - Pressure Transmitter
PI - Pressure Indicator
PS - Pressure Switch
FT - Flow Transmitter
FI - Flow Indicator
FS - Flow Switch
TT - Temperature Transmitter
TI - Temperature Indicator
TS - Temperature Switch
LT - Level Transmitter
LI - Level Indicator
LS-Level Switch
AIT - Analytical Instrument Transmitter
PDIT - Differential Pressure Indicator Transmitter
Electrical & Control Systems
MTR – Motor
PLC - Programmable Logic Controller
DCS - Distributed Control System
ESD - Emergency Shutdown Device
SOL- Solenoid
ALM - Alarm
HS-Hand Switch
PSV - Pressure Safety Valve
Equipment
P - Pump
C- Compressor
HX - Heat Exchanger
T - Tank
V - Vessel
B - Boiler
F - Filter
M - Mixer
R- Reactor
CH - Chiller
EV - Evaporator
Safety & Miscellaneous
BDV - Blowdown Valve
PSV - Pressure Safety Valve
PRV - Pressure Relief Valve
SRV - Surge Relief Valve
FA - Fire Alarm
FG - Flare Gas
MSD - Manual Shutdown
Safety & Miscellaneous
BDV - Blowdown Valve
PSV - Pressure Safety Valve
PRV - Pressure Relief Valve
SRV - Surge Relief Valve
FA - Fire Alarm
FG - Flare Gas
MSD - Manual Shutdown
What makes these Codes important?
P&ID codes are more than just symbols; they serve as the basis for effective team communication and guarantee process safety and efficiency. Understanding the universal language of engineering is a prerequisite for mastering them.
You can also follow us on AutomationForum.co, Facebook and Linkedin to receive daily Instrumentation updates.
You can also follow us on ForumElectrical.com , Facebook and Linkedin to receive daily Electrical updates.