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SYMBOLS & STANDARDS
1) INSTRUMENT ABBREVIATIONS
PRESSURE
� P : PRESSURE
� PI : PRESSURE INDICATOR
� PG : PRESSURE GAUGE
� PCV : PRESSURE CONTROL VALVE
� PT : PRESSURE TRANSMITTER
� PIT : PRESSURE INDICATING TRANSMITTER
� PIC : PRESSURE INDICATING CONTROLLER
� PDT : PRESSURE DIFFERENTIAL TRANSMITTER
� PRV : PRESSURE REDUCING VALVE
� PSV : PRESSURE SAFETY VALVE
� PS : PRESSURE SWITCH
� PSH : PRESSURE SWITCH HIGH
� PSL : PRESSURE SWITCH LOW
� PSHH : PRESSURE SWITCH HIGH HIGH
� PSLL : PRESSURE SWITCH LOW LOW
� PDS : PRESSURE DIFFERENTIAL SWITCH
� PDSH : PRESSURE DIFFERENTIAL SWITCH HIGH
� PDSL : PRESSURE DIFFERENTIAL SWITCH LOW
� PA : PRESSURE ALARM
TEMPERATURE
� T : TEMPERATURE
� TI : TEMPERATURE INDICATOR
� TW : THERMOWELL
� TM : THERMOMETER
� TE : TEMPERATURE ELEMENT
� RTD : RESISTANCE TEMPERATURE DETECTOR
� T/C : THERMOCOUPLE
� TT : TEMPERATURE TRANSMITTER
� TIC : TEMPERATURE INDICATING CONTROLLER
� TRC : TEMPERATURE RECORDER CONTROLLER
� TCV : TEMPERATURE CONTROL VALVE
� TS : TEMPERATURE SWITCH
� TSH : TEMPERATURE SWITCH HIGH
� TSL : TEMPERATURE SWITCH LOW
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� TA : TEMPERATURE ALARM
FLOW
� F : FLOW
� FI : FLOW INDICATOR
� FG : FLOW GLASS / FLOW GAUGE
� FE : FLOW ELEMENT
� FIT : FLOW INDICATING TRANSMITTER
� FCV : FLOW CONTROL VALVE
� FIC : FLOW INDICATING CONTROLLER
� FS : FLOW SWITCH
� FY : FLOW CONVERTER
� FA : FLOW ALARM
� FR : FLOW RECORDER
� FRC : FLOW RECORDING CONTROLLER
LEVEL
� L : LEVEL
� LI : LEVEL INDICATOR
� LG : LEVEL GAUGE
� LIT : LEVEL INDICATING TRANSMITTER
� LCV : LEVEL CONTROL VALVE
� LDT : LEVEL DISPLACER TRANSMITTER
� LIC : LEVEL INDICATING CONTROLLER
� LRC : LEVEL RECORDING CONTROLLER
� LS : LEVEL SWITCH
� LSH : LEVEL SWITCH HIGH
� LSL : LEVEL SWITCH LOW
� LA : LEVEL ALARM
� RLT : RADAR LEVEL TRANSMITTER
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GENERAL
� DCS : DISTRIBUTED CONTROL SYSTEM
� SCADA : SUPERVISORY CONTROL AND DATA ACQUISITION SYSTEM
� PLC : PROGRAMMABLE LOGIC CONTROLLER
� HART : HIGHWAY ADDRESSABLE REMOTE TRANSDUCER
� HHT : HAND HELD TERMINAL
� SFC : SMART FIELD CONFIGURATOR
� ESD : EMERGENCY SHUT DOWN
� AOV : AIR OPERATED VALVE
� MOV : MOTOR OPERATED VALVE
� SV : SOLENOID VALVE
� XVE : VIBRATION PROXIMITOR
� XVT : VIBRATION TRANSMITTER
� AE : ANALYZER
� JB : JUNCTION BOX
� ILD : INSTRUMENT LOOP DIAGRAM
� P&ID : PIPING AND INSTRUMENT DIAGRAM
� IIS : INSTRUMENT INSTALLATION SCHEDULE
� TDR : TIME DELAY RELAY
� SP : SET POINT
� NC : NORMALLY CLOSED
� NO : NORMALLY OPEN
� MCC : MOTOR CONTROL CENTRE
� IAS : INSTRUMENT AIR SUPPLY
� IGS : INSTRUMENT GAS SUPPLY
� ACFO : AIR TO CLOSE FAIL OPEN
� AOFC : AIR TO OPEN FAIL CLOSE
� FFA : FLAME FAILURE ALARM
� P/I – P to I : PNEUMATIC TO CURRENT CONVERTER
� I/P – I to P : CURRENT TO PNEUMATIC CONVERTER
� PB : PUSH BUTTON
� PID : PROPORTIONAL, INTEGRAL AND DERIVATIVE
� E/H : ELECTRO HYDRAULIC ACTUATOR
� BOV : BLOW DOWN VALVE
� A/M : AUTO / MANUAL – 2 POSITION SWITCH
� ZS : POSITION SWITCH
� HS : HAND SWITCH
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2) INSTRUMENT LINE SYMBOLS
2.1) INSTRUMENT SUPPLY or CONNECTION TO PROCESS ___________________ 2.2) PNEUMATIC SIGNAL ___________________ 2.3) ELECTRICAL SIGNAL (ANALOG SIGNAL) (mA DC (OR) VDC) ------------------------ 3.4) ELECTROMAGNETIC or SONIC SIGNAL ___________________
3.5) HYDRAULIC SIGNAL ___________________ 2.6) CAPILLARY TUBE (FILLED SYSTEM) ___________________
2.7) PULSE TRAIN _ _ _ _ _ _ _ 2.8) INTERNAL SYSTEM LINK (SOFTWARE or DATA LINK) -----------------------------------------------------------------------------------------------------------------
3) TYPES OF SUPPLY
3.1) AS - AIR SUPPLY IA – INSTRUMENT AIR PA – PLANT AIR 3.2) ES – ELECTRICAL SUPPLY 3.3) GS – GAS SUPPLY 3.4) HS – HYDRAULIC SUPPLY 3.5) NS – NITROGEN SUPPLY 3.6) SS – STEAM SUPPLY 3.7) WS – WATER SUPPLY
The “ES” or “AS” symbol is to be used only for Field Devices requiring supply. For panel mounted instruments power supplies are not shown on flow sheet.
U MULTIVARIABLE (6) MULTIFUNCTION (12) MULTIFUNCTION (12) MULTIFUNCTION (12)
V VIBRATION, MECHANICAL ANALYSIS (19)
VALVE, DAMPER, LOUVER (13)
W WEIGHT, FORCE WELL
X UNCLASSIFIED (2) X AXIS UNCLASSIFIED (2) UNCLASSIFIED (2) UNCLASSIFIED (2)
Y EVENT, STATE / PRESENCE (20)
Y AXIS RELAY, COMPUTE, CONVERT(13,14,18)
Z POSITION, DIMENSION Z AXIS DRIVER, ACTUATOR, UNCLASSIFIED FINAL CONTROL ELEMENT
NOTE: Numbers in parentheses refer to specific explanatory notes.
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6) TYPICAL LETTER COMBINATIONS
TABLE – 2
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7) FUNCTIONAL BLOCKS – FUNCTIONAL DESIGNATIONS
THE FUNCTION DESIGNATIONS ASSOCIATED WITH CONTROLLERS, COMPUTING DEVICES,
CONVERTERS AND RELAYS MAY BE USED INDIVIDUALLY OR IN COMBINATION (ALSO SEE TABLE 1, NOTE 14). THE USE OF A BOX AVOIDS CONFUSION BY SETTING OFF THE SYMBOL FROM OTHER MARKINGS ON A DIAGRAM AND PERMITS THE FUNCTION TO BE USED AS A STAND ALONE BLOCK ON