Legend & Symbols
P&ID
Bambang HN
Tripatra, 1 Sept 2014
Legend & Symbol
Abbreviation
Meaning
Abbreviation
Meaning
BDV
Blowdown Valve
SDV
Shutdown Valve
EDP
Emergency Depressurize
SOV
Solenoid Valve
ESD
Emergency Shutdown
SP
Set Point
ESDV
Emergency Shutdown Valve
SR
Split Range
HCV
Hand Control Valve
SS
Soft Start/Start
IAS
Instrument Air Supply
TBG
Tubing
MCS
Monitoring and Control System
UA
Unit Alarm
PST
Pump Start
VDU
Visual Display Unit
PSTP
Pump Stop
VFD
Variable Frequency Drive
R
Reset
XV
Actuated On/Off Valve
REV
Reverse Acting
Legend & Symbol
Item
Description
Connection to Process Mechanical Link or
Instrument Supply
Pneumatic Signal
Software or Data Link
Electrical Signal
Electromagnetic or High Frequency Signal
Instrument Tubing
Hydraulic Signal
Capillary
Legend & Symbol
Legend & Symbol
Pressure
Pressure Gauge
Pressure Transmitter
Capillary Temperature Transmitter
(with well)
Flanged Thermowell
Bi-Metallic Type (with Well)
RTD – Temperature Transmitter
(with well)
Thermowell
Temperature Element
(with well)
Temperature
Legend & Symbol
Level
Legend & Symbol
Flow
Orifice Plate
Positive Dispalcement
Type with Flow Totalizing
Indicator
Orifice Plate with
Quick Change
Fitting
Turbine Primary
Element
Flow Switch
Annubar Element
Silencer
Non Intrusive Element
Ventury Type
Flow Element
Variable Area
Restricted Orifice
Nozzle Type
Flow Element
Legend & Symbol
Valves
Gate Valve
Needle Valve
Hydraulic/Pneumatic
Actuated Valve
Ball Valve
Hand Control Valve
Three Way Valve
Globe Valve
Motor Operated
Valve
Pressure Vacuum
Relief Valve
Check Valve
Control Valve c/w
Positioner
Pressure Safety Valve
Butterfly Valve
Self-Acuating Control
Valve
Plug Valve
Control Valve with
Hand Wheel
Legend & Symbol
Connection
Legend & Symbol
Equipment
Legend & Symbol
Equipment
MOTOR DRIVEN SCREW PUMP
Legend & Symbol
Equipment
FLAME ARRESTOR
BUG SCREEN
Legend & Symbol
General
Legend & Symbol
Sample Connection
For liquid sample below 150 °F with atm,
Boiling temperature above the sample
Temperature for all possible conditions
For liquid sample below 150 °F with atm,
Boiling temperature below the sample
Temperature.
Legend & Symbol
Sample Connection
For HC vapor and Fuel Gas
For propane liquid.
Propane is sampled at liquid
Instrument Identification
Instrument Identification
Functional Identifier
Line Identification
Service Code
Line Identification
Service Code
Line Identification
Piping Class
Line Identification
Piping Line Numbering
Line Type
Low Pressure Process (300# ASME and lower)
Off-skid number
1000
On-skid number
100
High Pressure Process (600# and higher)
2000
200
Extra High Pressure (API 3000#/5000# / 10000#, 15000#, eqp. trim)
3000
300
LP Flare/Cold Flare/Vent
HP Flare/Vent
Drain Open/Closed
Fuel & Utility Gases
Fuel & Utility Liquid
Utility Water
4000
5000
6000
7000
8000
9000
400
500
600
700
800
900