常见的PID图例缩写符号

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FO FAIL OPEN 故障时打开 FC FAIL CLOSE 故障时关闭

FL(O) FAIL LOCKED(LAST POSITION) VALVE OPENS ON DECREASING CONTROL SIGNAL

FL(C)) FAIL LOCKED(LAST POSITION) VALVE CLOSES ON DECREASING CONTROL SIGNAL

SPLIT RANGE DESIGNATION

A FIRST VALVE TO RESPOND TO INCREASING CONTROL SIGNAL

B SECOND VALVE TO RESPOND TO INCREASING CONTROL SIGNAL

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MISCELLANEOUS ITEMS 各种

INLINE INSTRUMENTS 在线仪表 FLAME ARRESTOR

CONTINUOUS DRAINER

OPTIONAL VENT LINE

EXCESS FLOW VALVE

PROCESS STEAM TRAP

ANALYZER

ANALYTICAL COMPONENT OR PHYSICAL PROPERTY

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PURGING DETAIL DIAPHRAGM SEALS

PIPED CONNECTION

FLUSH MOUNTED TRACING

CONVENTIONAL INSTRUMENTATION

DIGITAL INSTRUMENTATION

PUSHBOTTON , SWITCHES & LIGHTS

INDICATING LIGHT

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PUSHBOTTON

PUSHBOTTON WITH LIGHT SWITCH

SWITCH WITH LIGHT(LIGHT INCLUDED FOR EACH PUSHBUTTON FUNCTION)

HIGH/LOW OPEN/CLOSE

LIGHT DESIGNATION

MEASURED VARIABLE FUNCTION

BYP BY PASS

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HOA HAND/OFF//AUTOMATIC

O/C OPEN/CLOSE RESET

S/S START/STOP

TRIP TRIP NOTES

1. FOR PIPING AND EQUIPMENT SYMBOLS , SEE DWG 000054

2. THE INSTRUMENTATION REPRESENTATION ON P&I FLOW DIAGRAMS,

IN GENERAL , CONSISTS OF A SINGLE OR SEVERAL BALOONS

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