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Standard P&ID Symbols Legend | Industry Standardized P&ID Symbols
Piping and Instrument Diagram Standard Symbols Detailed Documentation provides a standard set of shapes & symbols for documenting P&ID and PFD,
including standard shapes of instrument, valves, pump, heating exchanges, mixers, crushers, vessels, compressors, filters, motors and connecting shapes.
Instrument
Indicator
Computer Indicator
LC
65
Behind Control
Programmable
Indicator
PT
55
Pressure
Transmitter
On Central
Control
Displayed
Programmable
Device
PR
55
Pressure
Recorder
On Local
Control Pane
Computer
PC
Pressure
Controller
Behind a Local
Control
Unit Control
Panel
Indicator 2
Indicator 3
55
Indicator 4
Indicator 5
50
Odometer
TI
TT
TR
TC
FI
FT
Pressure
Gauge
FR
Temp Indicator
105
PRC
Temp
Transmitter
LA
Temp Recorder
Temp
Controller
Flow Indicator
Flow
Transmitter
FE
TE
LG
AT
Thermometer
Shared Indicator
Displayed
Configurable
Not Gate
Correcting
Element
FC
LI
PI
LT
65
Diamond
Pressure
Indicating
Flow Controller
Level Indicator
Pressure
Indicator
P
S
P X
X
Thermometers
Pressure
Recording
Ultrasonic Meter
Averaging Pitot
Tube
Level Alarm
V-cone Meter
Level Meter
Flow Element
Venturi Meter
Temperature
Element
Quick Change
Turbine Meter
Level Gauge
Analyzer
Transmitter
Rotometer
Double
Transducer
Steam Traced
Coriolis Flow
Sensor
Flow Nozzle
Meter
Flume Meter
Manhole
Socket
Connection
Specialty Item
Venturi
S
Pressure
Gauges
Weir Meter
Flow Recorder
1
Flowmeter
Pitot Tube
Target Meter
PIC
25
T
Pitot Tube Type
Flow
Or Gate
Wedge Meter
40
T
Magnetic
Level
Controller
Support Bracket
Sampler
Flowmeter
Support Leg
Straightening
Vanes
Level
Transmitter
Diaphragm
Meter
Vortex Sensor
Support Ring
D
Level Recorder
R
Rotary Meter
And Gate
Support Skirt
Hand-Operated
Gate Valve
Check Valve 2
S
Solenoid Valve
4-way Plug
Valve
Pinch Valve
Gate Valve
Butterfly Valve
Closed Gate
Valve
Flanged Valve
Hand-Operated
Globe Valve
Flanged Valve 2
Shared Indicator
LR
65
Valves
Globe Valve
Angle Valve
Hand-Operated
Plug or Cock
Valve
Check Valve
P
Motor-Operated
Valve
Electro-Hydraulic
Valve
Balanced Diaphragm
Gate Valve
Pilot Gate Valve
Gauge
Bleeder Valve
Spring Gate Valve
W
Integrated Block
Valve
Ram Valve
Relief Valve
Powered Valve
Slide Valve
Maual Integrated
Valve
Angle Valve
Float-Operated
Valve
Metering Coke
Orifice
Needel Valve
Back Pressure
Regulator
Auto Recirculation
Weight Gate
Valve
Angle Globe
Valve
Piston-Operated
Valve
4-way Valve
Hydraulic Valve
E/H
M
Rotary Valve
Control Valve
H
Minimum Flow
Valve
Knife Valve
Angle Blowdown
Valve
Needle Valve
Ball
Excess Flow
Valve
3-Way Valve
Normally Closed
Ball
Post Indicator
3-Way Valve 2
Diaghragm
Self Draining Valve
3-Way Plug
Valve
Plug Valve
Rotameter
Quarter Turn Valve
Double Acting
Quarter Turn Valve
Spring Acting
Water Flow Meter
Diaphragm Valve
Self-Operating
Release Valve
Reciprocating
pump
Diesel motor
Pumps
Compressor
Reciprocating
Compressor
Reciprocating
Compressor 2
Axial
Compressor
Centrifugal
pump
Centrifugal
pump 3
Centrifugal
Centrifugal
pump 4
Rotary
Compressor 2
Turbine pump
Positive displacement
pump 2
Centrifugal
pump 2
Compressor
silencers
Rotary
Compressor
Sump pump
Rotary pump
Fan
Rotary gear
pump
Selectable fan
Peristaltic pump
Fan blades
Gas blower
Fan blades 2
Gear pump
Vertical pump
ISO centrifugal pump
ISO diaphragm
pump
ISO gear pump
ISO Progressive
pump
ISO positive
displacement pump
Triple fan blades
Rotory Compressor
and silencers
Liquid ring
Compressor
Pump 2
ISO Liquid pump
ISO reciprocating
piston pump
Proportioning pump
Axial flow fan
Liquid ring
vacuum pump
Vacuum pump
ISO screw pump
Turbine driver
Centrifugal
Compressor
T
Centrifugal
Compressor 2
Selectable
Compressor
Screw pump
Doubleflow turbine
Positive displacement
pump
Screw pump 2
Pump
Motor driven turbine
Cavity pump
Centrifugal
Compressor 3
Horizontal pump
Centrifugal
blower
Positive displacement
pump
Submersible pump
Ejector
Vertical pump
Reciprocating
pump
Spray
Packing column
Boiler
Covered Tank
Thermal Insulation
Vessel
Dome Boiler
Floating Roof Tank
Heating-cooling
Jacket Vessel
Knock-out drum
Hot Liquid Boiler
Open Bulk Storage
Brackets Vessel
Bag
Tank
Dome Roof Tank
Dished Ends Vessel
Bag (ISO)
Tank 2
Cone Roof Tank
Pit Vessel
Barrel
Tank 3
Internal Floating
Roof Tank
Electrical Heating
Vessel
Staggered Baffle
Trays Column
Barrel (ISO)
Tank 4
Double Wall Tank
Wastewater Treatment
Packing Column
Gas bottle
Open tank
Mode Filter
Filter
Fixed bed air Filter
Mode Filter indication
Filter 2
Motor
Vessels
Vertical Vessel
Mixing Vessel
Drum
Column
Tray Column
Fluidized Bed Column
Onion Tank
Bin
Filters
HE
PA
BIO
Biological Filter
High efficiency Filter
Primary Filter
Mid-effect Filter
ION
HEPA gas Filter
Ionexchanger Filter
Oxygen-enriched Filter
Filter
Gas Filter
Press Filter
Liquid Filter
Filter
Highpass Filter
Fixed bed liquid
Filter
Cartridge gas Filter
Lowpass Filter
Bandpass Filter
Rotary liquid
Filter
Roll air Filter
Air Filter
Filter 2
Air Filter 2
Rotary Filter
The Filter
Suction Filter
Liquid ring
Compressor
Axial Compressor
Centrifugal
Compressor
Air Compressor
Compressors
Compressor silencers
Compressor
Ejector Compressor
Compressor 2
Piston Compressor
Compressor,
Vacuum pump
Ring Compressor
Rotary Compressor
2
Centrifugal
Compressor 2
AC air Compressor
Centrifugal
Compressor
Roller vane
Compressor
Rotory
Compressor 3
Centrifugal
Compressor 3
Screw Compressor
Reciprocating
Compressor 3
Rotory Compressor
and silencers
Selectable
Compressor
Turbo Compressor
Spray Cooler
Shell and Tube
Heat 3
Reboiler
Oil Burner
Single Pass Heat
Exchanger
Fired Heater
Diaphragm
Compressor
Rotary Compressor
T
Heat Exchanges
TEMA TYPE BEM
TEMA TYPE BEU
Cooler
Forced-draft
Cooling Tower
Single Pass Heat
Exchanger
TEMA TYPE AEM
TEMA TYPE AEL
Air-blown Cooler
Induced-draft
Cooling Tower
Vertical Turbine
Double Pipe Heat
Exchanger
Induced Flow Air
Cooler
TEMA TYPE NEN
TEMA TYPE BKU
Plate Exchanger
Plate and Frame
Heat Exchanger
Heat Exchanger
Fin-fan Cooler
Hairpin Exchanger
Condenser
Electric Heater
Spiral Heat
Exchanger
Extractor Hood
Heat Exchanger 2
Heat Exchanger 3
Straight Tubes
Heat Exchanger
Heater
Spiral Heat
Exchanger 2
Hose reel
Air Cooled
Exchanger
Light Water Station
Briquetting
Machine
Combustion
Chamber
U-Tube Heat
Exchanger
Silencer
U-tube Heat
Exchanger
Thin-Film
Evaporator
Reboiler Heat
Exchanger
Boiler
Vent
Coil Tubes Heat
Exchanger
Finned Tubes
Heat Exchanger
Exchanger
Dryer
Floating Head
Heat Exchanger
Condenser
Cooling Tower
Cooling Tower 2
Plate Heat
Exchanger
Shell and Tube
Heat
Kettle Heat
Exchanger
Cooling Tower 3
Shell and Tube
Heat 2
Dryer
Roller Conveyor
Belt Dryer
Generator
Heat Consumer
Fluidized Bed
Dryer
Motor Generator
Drying Oven
Spray Dryer
Dryers
Moving Shelf Dryer
General
Crossflow
Inducted Draft
Screen
Plate Tower
Fluidized Reactor
Fluid Catalytic
Cracking
Counterflow
Forced Draft
Boom Loader
Packed Tower
Alkylation
Fluid Coking
Chimney Tower
Hyperbolic
Automatic Stoker
Hydrocracking
Furnace
Electric Motor
Furnace
Tubular
Hydrodesulfurization
Hydrocracking
Transport
Agitator, Turbine
Agitator, Disc
Mixers
In-line Mixer
Mixer
Various Mixers
Various Mixers
Agitator, Propeller
Various Mixers 2
Agitator, Anchor
Agitator, Helical
Agitator,
Cross-beam
Agitator, Stirrer
Agitator, Impeller
Medium Crushers
Various Crushers
Jaw Crusher
Hammer Crusher
Roller Crusher
Impact Crusher
Cone Crusher
Agitator, Gat Paddle
Crushers
Crusher
Coarse Crusher
Vibration Crusher
Hammer Crusher
Fine Crushers
Centrifuges
Centrifugal Pump
Centrifugal
Compressor
T
Centrifugal
Compressor 2
Centrifugal
Compressor 3
Centrifuge Screw
Centrifuge, Pusher
Centrifuge,
Solid Shell
Centrifuge Screw,
Perforated Shell
Centrifugal Pump
Centrifugal Pump 4
Centrifuge, High
Speed
Centrifuge,
Separator disc
Centrifugal Pump 2
Centrifugal Fan
Centrifuge,
Skimmer
Centrifuge
Centrifugal Pump 5
Motor-operated
Valve
Diesel Motor
Electric Motor
Centrifuge,
Perforated Shell
Centrifugal Blower
Centrifugal Pump 3
Motors
M
Motor
AC Motor
Generator
Step Motor
Motor Generator
AC Generator
Motor-driven
Turbine
DC Motor
Gear
DC Generator
Motor
Impact Separator
Injector
Elevator
Elevator 2
Vertical Shaping
Machines
Gravity Separator
Reducer
Z-form Elevator
Skip Hoist
Pelletizing Disc
Rupture Disc
Lift
Conveyor
Cyclone Separator
Piston Press
Hoists
Conveyor,
Chain, Closed
Roller Press
Turbine
Peripheral
Electromagnetic
Separator
Electrostatic
Precipitator Separator
Viewing Glass
Viewing Glass
with Lighting
Conveyor,
Screw, Closed
Aerator with
Sparger
Crane
Roller Conveyor
Cyclone
Solidifier
Back Draft
Damper
Bag Filling
Machine
Conveyor
Curved Gas Vent
Permanent
Magnet
Spray Nozzle
Rotary Table
Feeder
Box Truck
Overhead
Conveyor
Belt Skimmer
Firing System
Manual Forklift
Screw Conveyor
Screening
Flame Arrestor
Scraper
Conveyor
Truck Forklift
Palletizer
Bucket Elevator
Proportional
Feeder
Piston Extruder
Shaping Machines
Industrial Truck
Rotary Valve
Feeder
Rolling Bin Truck
Metering
Proportional Feeder
Ship
Elevator 1
Screw Extruder
Shaping Machines
Gas Flare
Horizontal Shaping
Machines
Double
Containment
Electrically
Insulated
Expansion Joint
Flange
In-line Mixer
Hose
End Caps
Separator
Chimney
Conveyor,
Vibrating, Closed
Piping and Connecting Shapes
Major Pipeline
Top to Top
Connect Pipeline
Sonic Signal
Major Straight
Line Pipe
Nuclear
Straight Line Pipe
Pneumatic
Control
Battery Limit Line
S
Bursting Disc
Flame Arrester
Pneumatic Binary
Signal Line
Drain Silencer
Drip Pan Elbow
Heat Trace
Exhaust Silencer
Electric Binary
Signal Line
Flange
Electric Binary
Signal Line
Sleeve Joint
One-to-Many
General Joint
Mid Arrow
Multi-Lines Elbow
Y-strainer
Diverter Valve
Y-type Strainer
Union
Exhaust Head
Damper
Socket Weld
Triangle
Separator
Breakthrough
Screwed
Connection
Triangle
Separator 2
Tundish
Butt Weld
Flanged Dummy
Cover
Open Vent
Electrical Bounded
Syphon Drain
Slope
Requirements Line
Hydrant
Welded
Connection
Soldered/
Solvent
Swivel Joint
Reducer
Pulsation
Dampener
Blind Disc
D
Detonation Arrestor
F
Flame Arrestor
S
In-line Silencer
S
T
Basket Strainer
Cone Strainer
Expansion Joint 2
Orifice Plate
Pilot Operated
Relief Valve with
Renote Sensor
Coupling
Electrically
Insulated
Flame Arrestor
Detonation-Proof
Flame Arrestor
Vent Silencer
Steam Trap
Fire-Resistant
Flame Arrestor
DS
Desuperheater
Open Disc
Bursting Disc
Clamped Flange
Coupling
Explosion-Proof
Flame Arrestor
Duplex Strainer
Spectacle Blind
Rotary Valve
Orifice
Compensate
Mechanical Link
Interchangeable
Blind
Basket Strainer
Breather
Orifice Plate
Multi-Lines
Removable Spool
Strainer
Side by Side
Traced Line
Bell Mouth
Breather
Electronic Serial
Top-Bottom
Flow Indicator
End Cap 2
Electric Signal
Line
H
Flexible Hose
Ejector or
Eductor
Exhaust Head
Fire-Resistant, ExplosionProof Flame Arrestor
Valve Manifold
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