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Appendix - B
© IDC Technologies Ver 1.02 UK English B.1
Plug Valve
Gate Valve
Globe Valve
Needle Valve
Instrument Representation
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
© IDC Technologies Ver 1.02 UK English B.2
Spring Check Valve
Angle Valve
Safety or Relief Valve
(Inlet Port Shown Closed)
Check Valve
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
4-Way Valve
3-Way Valve
Rotary Valve
Butterfly Valve
© IDC Technologies Ver 1.02 UK English B.3
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Alarm Valve
Dual Purge Valve
Restriction Orifice Drilled
In Valve
OS & Y Valve
© IDC Technologies Ver 1.02 UK English B.4
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
(Arrows Indicate Flow
Four-Way Valve
Direction)
Ball Valve
Reducer
Three-Way Valve
(Closed Port Darkened)
© IDC Technologies Ver 1.02 UK English B.5
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Two-Way Valve, Fail Closed
Two-Way Valve, Fail Open
Actuator
4-Way Valve W/Diaphram
Actuator
3-Way Valve W/Diaphram
© IDC Technologies Ver 1.02 UK English B.6
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Strainer with Valve
Pressure Relief or Safety
Valve, Straight-Through
Pattern, Spring- or Weight-
Loaded, or with Integral
Pilot
Vacuum Relief Valve
Set Point
Pressure -Reducing
Regulator, Self-Contained,
with HandWheel Adjustable
© IDC Technologies Ver 1.02 UK English B.7
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Diaphragm Valve
Ball-Check Valve
Pressure Reducing
Regulator with External
Pressure Tap
Pressure Relief or
Safety Valve
© IDC Technologies Ver 1.02 UK English B.8
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Differential-Pressure-
Reducing Regulator with
Internal and External
Taps
Back Pressure Regulator,
Self-Contained
Pressure-Reducing
Regulator with Integral
Outlet Pressure Relief
Valve, And Optional
Pressure Indicator
PIPI
Back Pressure Regulator
with External Pressure
Tap
© IDC Technologies Ver 1.02 UK English B.9
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Rupture Disk or Safety Head
for Vacuum Relief
Rupture Disk or Safety Head
for Pressure Relief
R=Red G=GreenX=Color
Pilot LightXX
Flex Connection (Rubber)
© IDC Technologies Ver 1.02 UK English B.10
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Flex Connection (Steel
Braided)
Single Pitot Tube or Pitot
Venturi Tube
Flow Meter
Flow Nozzle or Venturi
© IDC Technologies Ver 1.02 UK English B.11
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Screwed Cap
Pipe Cap
Hose Connection
Flanged Connection
(Piping or Equip)
© IDC Technologies Ver 1.02 UK English B.12
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Y-Strainer
Compressed Air
Ducted Air Flow
from Space
Capped Air Duct
© IDC Technologies Ver 1.02 UK English B.13
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Diaphram Actuator
Diaphram Pressure-
Balanced
Spring-Opposed
Single-Acting
Spring-Opposed
Double-Acting
© IDC Technologies Ver 1.02 UK English B.14
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Hand Actuator or
Hand Wheel
Resriction Orifice in
Process Line
Flow Straighting Vane
PIPI Pressure Indicator
© IDC Technologies Ver 1.02 UK English B.15
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Air Intake Filter
Alarm
Bubble Gauge
In-Line Filter
© IDC Technologies Ver 1.02 UK English B.16
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
© IDC Technologies Ver 1.02 UK English B.17
Pressure Relief
Electrohydralic Actuator
EEHH
Flow Orifice Fixed
Flow Direction
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
XX- Drain System Annotations
Double Basket Strainer
Open Drain
Hose Reel
XXXX
© IDC Technologies Ver 1.02 UK English B.18
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Cleanout (Plan View)
Space Penetrations
Silencer/Muffler
Sanitary Vent
© IDC Technologies Ver 1.02 UK English B.19
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Thermostatic Vent
55 Gallon Drum
LubricatorL
Trap XX Annotates FunctionXX
© IDC Technologies Ver 1.02 UK English B.20
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
© IDC Technologies Ver 1.02 UK English B.21
Fixed Louvers
Drain (Plan View)
Box Filter
(Water Motor Gong)
Sprinkler Alarm
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Flow Alarm Valve
Multi Blade Damper
Opposing Blade Damper
Single Blade Damper
© IDC Technologies Ver 1.02 UK English B.22
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
© IDC Technologies Ver 1.02 UK English B.23
Humidifier
Manual Balance
Damper
PressurizedGas Bottle
HH
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
© IDC Technologies Ver 1.02 UK English B.24
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Orifice
M Magnetic
Turbine or Propeller
Ultra Sonic
Vortex
Pitot Tube
Averaging Pitot Tube
© IDC Technologies Ver 1.02 UK English B.25
DescriptionSymbol
Practical Fundamentals of Chemical Engineering Appendix - B
Flow Nozzle
Venturi
Wedge Meter
Flume
Weir
Positive Displacement
Rotameter