Study of Instrumentation Symbols as Per ISA Standards
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INDUSTRIAL PROCESS CONTROL:STANDARDS
Purpose
To establish a uniform mean of designating instruments and instrumentation systems used for measurement and control.
Scope
1) General The procedural needs of various users
are different. The standard recognizes these needs, when they are consistent with the objectives of the standardly by providing alternative symbolism methods.
A number of examples are provided for adding information or simplifying the symbolism as desired.
Scope
2) Application to Industries Chemical. Petroleum. Power generation. Air conditioning. Metal refining.
Scope
3) Application to Work Activities Design sketches. Teaching examples. Technical papers, literatures, and discussions. Instrumentation system diagrams, loop diagrams, logic
diagrams. Functional descriptions. Flow diagrams:
Process. Mechanical. Engineering. Systems piping (process) and instrumentation.
Construction drawings. Specifications, purchase orders, manifests, and other
lists.
Identification of the System
Each instrument may be represented on diagrams by symbols.
Instrument or function to be identified is designated by an alphanumeric code or tag number.
The symbols may be accompanied by a tag number.
FV101
Identification of the System(Tag Number)
Instrument Identification or tag number
TIC103
Identification of the System(Tag Number)
Loop identification
TIC103
Identification of the System(Tag Number)
Loop numberFirst number is used to identify the loop.The succeeding numbers is the serial number of the instrument in a particular loop.
TIC103
Identification of the System(Tag Number)
Function IdentificationFunction of the instrument is identified.
TIC103
Identification of the System(Tag Number)
First letterIdentifying the measured or initiating variable.
May have a modifier is intended to represent a new and separate measured variable.
TIC103
Identification of the System(Tag Number)
Succeeding lettersIdentifying the function performed.Second letter is used for the readout or passive function.Third letter is used for the output function.The succeeding letters may have a modifier to identify a separate function.
TIC103
Function Identification
First Letter Succeeding Letter
Measured or Initiating Variable
Modifier Read out or Passive Function
Output Function
Modifier
A Analysis Alarm
B Burner User’s choice
User’s choice
User’s choice
C User’s choice
Control
D User’s choice
Differential
E Voltage Sensor
F Flow rate Ratio
G User’s choice
Glass
H Hand High
I Current Indicator
J Power Scan
K Time Time rate Control station
L Level Light Low
M User’s choice
Momentary Middle
First Letter Succeeding Letter
Measured or Initiating Variable
Modifier Read out or Passive Function
Output Function
Modifier
N User’s choice
User’s choice
User’s choice
User’s choice
O User’s choice
Orifice
P Pressure Point
Q Quantity Integrate
R Radiation Record
S Speed Safety Switch
T Temperature
Transmit
U Multivariable
Multifunction
Multifunction
Multifunction
V Vibration Valve, damper
W Weight, Force
Well
X Un classified
X axis Un classified
Un classified
Un classified
Y Event, state
Y axis Compute
Z Position Z axis Actuator
Symbols
The symbols are intended to depict instrumentation on diagram and drawing.
Instrument Line Symbols
Instrument supply or connection to process
AS
Air supply
IA
Instrument Air
PA
Plant Air
ES
Electric Supply
GS
Gas Supply
HS
Hydraulic Supply
NS
Nitrogen Supply
SS
Steam Supply
WS
Water Supply The supply level may be added to the instrument supply line.E.g:- AS-100; ES-24DC
Undefined Signals
Pneumatic signal
Electric Signal
Hydraulic Signal
Capillary Tube
Internal system link (s/w or data link)Mechanical link
Electric binary Signal
General Instrument or Function Symbols
Discrete Instruments
Shared Display
Computer Function
Primary Location Normally
Accessible to Operator
Field Mounted
Auxiliary Location Normally
Accessible to Operator
Programmable Logic Control
Symbol Size may vary according to the user’s needs and the type of document.
Abbreviations of the user’s choice such as IP1 (Instrument Panel 1), IC2
(Instrument Console 2), CC3 (Computer Console 3), etc. may be used when it is
necessary to specify instrument or function location.
IP1
General Instrument or Function Symbols
Discrete Instruments
Shared Display
Computer Function
Primary Location Normally
Accessible to Operator
Field Mounted
Auxiliary Location Normally
Accessible to Operator
Programmable Logic Control
General Instrument or Function Symbols
Discrete Instruments
Shared Display
Computer Function
Primary Location Normally
Accessible to Operator
Field Mounted
Auxiliary Location Normally
Accessible to Operator
Programmable Logic Control
Normally in accessible, or
behind-the-panel devices or
functions may be depicted by
using the same symbol but with
dashed horizontal bars.
General Instrument or Function Symbols
Discrete Instruments
Shared Display
Computer Function
Primary Location Normally In-accessible to
Operator
Field Mounted
Auxiliary Location Normally In-accessible to
Operator
Programmable Logic Control
Control Valve Body Symbols
General Symbol
Angle
Butterfly
Rotary Valve
Three Way Valve
Four Way Valve
Globe Valve
Diaphragm Valve
Actuator Symbols
Diaphragm, spring opposed or unspecified actuator
Diaphragm pressure balanced
M Rotary motor (shown typically with electric signal may be hydraulic or pneumatic)
Actuator Symbols
Digital
Spring opposed single acting
Double acting
D
Actuator Symbols
Solenoid
Electrohydraulic
Valve actuator with attached electro pneumatic converter
S
E/H
TY
I/P
Actuator Symbols
For pressure relief or safety valve only
Hand actuator or hand wheel
Symbols for Self Actuated Regulators, Valves and Other Devices
FICV
Automatic regulator with integral flow indication
FI
Indicating variable area meter with integral manual throttle valve
Upstream alternative
Downstream alternative
FO
Restriction orifice (orifice plate, capillary tube, or multistage type, etc.) in process line
Symbols for Self Actuated Regulators, Valves and Other Devices
Restriction orifice drilled in valve (instrument tag number may be omitted if valve is otherwise identified
Flow slight glass, plain or with paddle wheel, flapper etc.
FO
Flow straightening vane (use of tag number is optional. The loop number may be the same as that of the associated primary element)
FG
FX
Symbols for Self Actuated Regulators, Valves and Other Devices
Hand control valve in process line
HS002
Hand actuated on-off switching valve in pneumatic signal line
HV
Level regulator with mechanical linkage
TankLCV
Symbols for Self Actuated Regulators, Valves and Other Devices
Pressure reducing regulator, self contained with hand wheel adjustable set point
Pressure reducing regulator with external pressure tap
PCV
Differential pressure reducing regulator with internal and external pressure taps
PCV
PDC
Symbols for Self Actuated Regulators, Valves and Other Devices
Back pressure regulator, self contained
Back pressure regulator with external pressure trap
PCV
Pressure reducing regulator with internal outlet pressure relief valve, and optional pressure indicator
PCV
PDC
Symbols for Self Actuated Regulators, Valves and Other Devices
Pressure relief or safety valve, general symbol
Pressure relief or safety valve, straight through pattern, spring or weight loaded, or with internal pilot
PCV
Vacuum relief valve, general symbolPCV
Symbols for Self Actuated Regulators, Valves and Other Devices
Pressure and vacuum relief valve, spring or weight loaded, or with internal pilot
PCV
Vacuum Pressure
Symbols for Actuator Action in Events of Actuator Power Failure
Two way valve, fail open
Two way valve, fail closed
A B
C
Three way valve, fail open to path AC
Symbols for Actuator Action in Events of Actuator Power Failure
Four way valve, fail open to paths CB and DA
Any valve, fail locked (position does not change)
Any valve, fail indeterminate
A B
C
D
Primary Element Symbols
AIT001
AIT002
Dual analysis indicating
BE001
BI002
One burner ultra-violet flame detector connected to analog type flame intensity indicator
Primary Element Symbols
BE001
BE002 Two burner flame rod
sensor connected to common switch
BTBG003
Television camera and receiver to view burner flame
BS003
S TV
Primary Element Symbols
Orifice plate with flange or corner taps connected to differential pressure type flow indicator
Orifice plate with vena contracta taps
VC
FI005
FE002
Primary Element Symbols
Orifice plate with vena contracta, radius, or pipe taps connected to differential pressure type flow transmitter
Venturi tube
FT008
Primary Element Symbols
Variable area flow indicator
Flow element with connection for controller
FI017
FE017
FC018
Primary Element Symbols
Flow element integral with transmitter
Vortex sensor
FT017
FE005
Primary Element Symbols
Flow nozzle
Indicating wattmeter connected to pump motorJI
001
FE029
Primary Element Symbols
KI001
Clock
KC TIC
Time schedule controller, analog type, or self contained function generator
Primary Element Symbols
VI001
Mechanical analysis in three planesVXT
002VYT003
VXI004
VYI005
VZT007
VZI008
VI006
Primary Element Symbols
Self contained on-off room thermostat actuating circulating pump motor
Cascade control: flow controller set by level control
JI001
1-0
LC104
FC100
FT
SP
Primary Element Symbols
Differential temperature indicator
Flow ratio controller with two pens to record flow
FT101
TT101
TT102
TDI103
FT102
FR104
FR105
FFC103
Primary Element Symbols
Flow ratio controller with one pen to record flow ratio
Mass flow computation performed by mass-flow computing relay ‘FY’ having linear inputs for pressure and temperature and a non-linear input for flow
FFC103
FT101
FT101
TT117
FIC111
FY
PT201
FT101
GS
MassFlow
Primary Element Symbols
Flow transmitter with external temperature compensatorTT
300
FYFT
400
TRC302
Pressure balanced valve
Primary Element Symbols
TSL301
PSH501
FIC404
M
TSL301
PSH501
FIC404
MFY
Flow control loop that may be blocked by interlock actuated by either low temperature or high pressure
Heat Transfer Elements
Water cooled exchanger
Water cooled condenser
Shell and tube exchanger
Pumps and Compressors
Centrifugal Reciprocating
Rotary Blower or fan
Process Pressure Vessels
or Horizontal drums
or Vertical drums
Thank You
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