P&ID and Common Abbreviation

INTRODUCTION

A piping and instrumentation diagram (P&ID) is a diagram in the process industry which shows the piping of the process flow together with the installed equipment and instrumentation. The P&ID are also used to operate the process system. P&ID shows all of piping including the physical sequence of branches, reducers, valves, equipment, instrumentation and control interlocks.In this session we are going to discuss about P&ID and Common Abbreviation.

Based on Institute of Instrumentation and Control, a piping and instrumentation diagram (P&ID)is defined by the diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on International Society Automation (ISA) Standard S5.1

Functions of P&ID 

The main function of P&ID is related with a significant role in the maintenance and modification of the process that it describes. It is critical to demonstrate the physical sequence of equipment and systems, as well as how these systems connect. During the design stage, the diagram also provides the basis for the development of system control schemes, allowing for further safety and operational investigations, such as the hazard and operability study (HAZOP).

There are a few rules in preparing a P&ID whereby there are item that should be included and some items should not.

A P&ID should include:

  • Instrumentation and designations
  • Mechanical equipment with names and numbers
  • All valves and their identifications
  • Process piping, sizes and identification
  • Miscellaneous – vents, drains, special fittings, sampling lines, reducers, increasers and swaggers
  • Permanent start-up and flush lines
  • Flow directions
  • Interconnections references
  • Control inputs and outputs, interlocks
  • Interfaces for class changes
  • Seismic category
  • Quality level
  • Annunciation inputs
  • Computer control system input
  • Vendor and contractor interfaces
  • Identification of components and subsystems delivered by others
  • Intended physical sequence of the equipment

 

 A P&ID should not include: 

  • Instrument root valves
  • control relays
  • manual switches
  • primary instrument tubing and valves
  • pressure temperature and flow data

                               P&ID  Common Abbreviation

 

AE

AOV

BE

CR

DP

DT

 

FC

FCV

FE

FG

FHC

FHS

FI

FIC

FM

FQR

FQI

FR

FRC

FS

FT

Ftd

HCV

HS

LC

LCV

LG

LHC

LI

LIC

LR

LS

LT

Ltd

MOV

 

Analyzer Element (Chemical Composition)

Air Operated Valves

Burner Element (flame detector)

Conductivity Recorder

Differential Pressure

Density Transmitter

(also specific gravity and Baume)

Flow Controller

Flow Control Valve

Flow Element

Flow Sight Glass

Flow Hand Control (manual)

Hand Switch in Flow Loop

Flow Indicator

Flow Indicating Controller

Flow Meter (Pos. Displ. or Turb)

Flow Qantity Recorder

Flow Quantity Indicator

Flow Recorder

Flow Recorder Controller

Flow Switch

Flow Transmitter

Flow Transducer

Hand operated Control Valve

Hand switch

Level Controller

Level Control Valve

Level Gage Glass

Level Hand Control (manual)

Level Indicator

Level Indicating Controller

Level Recorder

Level Switch

Level Transmitter

Level Transducer

Motor Operated Valve

 

MT

PA

PC

PCV

PdI

pHT

PI

PIC

PIT

PR

PS

PT

PTd

PZV

RO

ST

SV

TC

TCV

TE

TI

TIC

TR

TRAP

TS

TSA

TT

TTd

TW

TY

WE

XA

XVE

XVS

ZV

Motion Transmitter

Pressure Alarm

Pressure Controller

Pressure Control Valve

Differential Pressure Indicator

pH Transmitter

Pressure Indicator

Press. Indicating Controller

Press. Indicating Transmitter

Pressure Recorder

Pressure Switch

Pressure Transmitter

Pressure Transducer

Pressure Relief Valve

Restriction Orifice

Speed Transmitter

Solenoid Valve

Temp. Controller

Temp. Control Valve

Temp. Element

Temp. Indicator

Temp. Indicating Controller

Temp. Recorder

Steam Trap or Airvent

Temp. Switch

Temp. Switch Alarm

Temp. Transmitter

Temp. Transducer

Thermowell

Relay in Temperature Loop

Weight Measuring Element

Annunciator

Vibration Detector

Vibration Switch

Safety Shut-down (Pilot) valve

 

P&ID legends

 

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