Legend & SymbolsP&ID

Bambang HNTripatra, 1 Sept 2014

Legend & Symbol

Abbreviation Meaning

BDV Blowdown Valve

EDP Emergency Depressurize

ESD Emergency Shutdown

ESDV Emergency Shutdown Valve

HCV Hand Control Valve

IAS Instrument Air Supply

MCS Monitoring and Control System

PST Pump Start

PSTP Pump Stop

R Reset

REV Reverse Acting

Abbreviation Meaning

SDV Shutdown Valve

SOV Solenoid Valve

SP Set Point

SR Split Range

SS Soft Start/Start

TBG Tubing

UA Unit Alarm

VDU Visual Display Unit

VFD Variable Frequency Drive

XV Actuated On/Off Valve

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

Temperature

Capillary Temperature Transmitter(with well)

Bi-Metallic Type (with Well)

Thermowell

RTD – Temperature Transmitter(with well)

Temperature Element(with well)

Flanged Thermowell

Pressure

Pressure Gauge Pressure Transmitter

Legend & Symbol

Level

Legend & Symbol

Silencer

Variable Area

Flow

Orifice Plate

Turbine Primary Element

Positive DispalcementType with Flow TotalizingIndicator

Flow Switch

Non Intrusive Element

Restricted Orifice

Orifice Plate withQuick Change Fitting

Annubar Element

Ventury TypeFlow Element

Nozzle TypeFlow Element

Legend & Symbol

Valves

Gate Valve

Ball Valve

Globe Valve

Check Valve

Butterfly Valve

Hand Control Valve

Motor OperatedValve

Control Valve c/wPositioner

Self-Acuating ControlValve

Pressure Safety Valve

Three Way Valve

Control Valve with Hand Wheel

Hydraulic/PneumaticActuated Valve

Pressure Vacuum Relief Valve

Plug Valve

Needle Valve

Legend & Symbol

Connection

Equipment

Legend & Symbol

EquipmentLegend & Symbol

MOTOR DRIVEN SCREW PUMP

Equipment

Legend & Symbol

FLAME ARRESTOR BUG SCREEN

GeneralLegend & Symbol

For liquid sample below 150 °F with atm,Boiling temperature above the sampleTemperature for all possible conditions

For liquid sample below 150 °F with atm,Boiling temperature below the sampleTemperature.

Sample Connection

Legend & Symbol

For HC vapor and Fuel GasFor propane liquid.Propane is sampled at liquid

Sample ConnectionLegend & Symbol

Instrument Identification

Instrument Identification

Functional Identifier

Line Identification

Service Code

Line Identification

Service Code

Line Identification

Piping Class

Line Identification

Line Type Off-skid number On-skid numberLow Pressure Process (300# ASME and lower) 1000 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 4000 400HP Flare/Vent 5000 500Drain Open/Closed 6000 600Fuel & Utility Gases 7000 700Fuel & Utility Liquid 8000 800Utility Water 9000 900

Piping Line Numbering