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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.

Options

IAS 130 kPa

ES 24 V DC

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4) GENERAL INSTRUMENT SYMBOLS

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5) IDENTIFICATION LETTERS

TABLE – 1

FIRST LETTER (4) SUCCEEDING LETTER (3)

MEASURED / INITIATING

VARIABLE

MODIFIER READOUT /

PASSIVE

FUNCTION

OUTPUT

FUNCTION

MODIFIER

A ANALYSIS (5, 19) ALARM

B BURNER, COMBUSTION USER’S CHOICE (1) USER’S CHOICE (1) USER’S CHOICE (1)

C USER’S CHOICE (1) CONTROL (13)

D USER’S CHOICE (1) DIFFERENTIAL (4)

E VOLTAGE SENSOR (PRIMARY ELEMENT)

F FLOW RATE RATIO (FRACTION) (4)

G USER’S CHOICE (1) GLASS, VIEWING DEVICE (9)

H HAND HIGH (7,15,16)

I CURRENT (ELECTRICAL) INDICATE (10)

J POWER SCAN (7)

K TIME, TIME SCHEDULE TIME, RATE OF CHANGE (4, 21)

CONTROL STATION (22)

L LEVEL LIGHT (11) LOW (7, 15, 16)

M USER’S CHOICE (1) MOMENTARY (4)

MIDDLE, INTERMEDIATE (7, 15)

N USER’S CHOICE (1) USER’S CHOICE (1) USER’S CHOICE (1) USER’S CHOICE (1)

O USER’S CHOICE (1) ORIFICE, RESTRICTION

P PRESSURE, VACUUM POINT (TEST) CONNECTION

Q QUANTITY INTEGRATE, TOTALIZE (4)

R RADIATION RECORD (17)

S SPEED, FREQUENCY SAFETY (8) SWITCH (13)

T TEMPERATURE TRANSMIT (18)

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

CONCEPTUAL DESIGNS.

TABLE -3

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8. APPLICATION EXERCISE