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INSTRUMENT IDENTIFICATION LETTERS
INSTRUMENT TAG NUMBERING SYSTEM
BDV
-
BLOWDOWN VALVE
PG
PHS
PI
PIC
PIT
PP
PR
PS
-
PRESSURE GAUGE
PRESSURE HAND SWITCH
PRESSURE INDICATOR
PRESSURE INDICATOR CONTROLLER
PRESSURE INDICATOR TRANSMITTER
PRESSURE POINT
PRESSURE RECORDER
PRESSURE SWITCH
PSV
PT
PV
PX
PY
PZA
-
PRESSURE SAFETY VALVE
PRESSURE TRANSMITTER
PRESSURE CONTROL VALVE
PRESSURE SIGNAL CONDTIONER/RELAY
I/P CONVERTOR
PRESSURE ALARM
AAAAA
-
AA
NNN
GENERAL INSTRUMENT SYMBOLS
LOCALLY MOUNTED
A
MOUNTED ON LOCAL
CONTROL PANEL
INSTRUMENT
TYPE
SYSTEM
NUMBER
SEQUENTIAL
NUMBER
CENTRAL CONTROL ROOM
MOUNTED BEHIND PANEL
SUFFIX
(Optional)
FF
FOUNDATION FIELD BUS DEVICE
LOOP NUMBER
ICS OPERATOR STATION FUNCTION
1
(CENTRAL CONTROL ROOM)
ESD
FO
FC
FA
FC
FCV
FDS
FE
FI
FIC
FIR
FIT
FO
FQI
FQIS
FQR
FR
FRC
FS
FT
-
-
FAIL OPEN (VALVE ONLY)
FAIL CLOSE (VALVE ONLY)
FLOW ALARM
FLOW CONTROLLER
FLOW CONTROL VALVE (SELF ACTUATING)
FLOW DIFFERENTIAL SWITCH
FLOW ELEMENT
FLOW INDICATOR
FLOW INDICATOR CONTROLLER
FLOW INDICATOR RECORDER
FLOW INDICATOR TRANSMITTER
FLOW (RESTRICTION) ORIFICE
FLOW TOTALISER INDICATOR
FLOW TOTALISER INDICATOR WITH SWITCH
FLOW TOTALISER RECORDER
FLOW RECORDER
FLOW RECORDING CONTROLLER
FLOW SWITCH
FLOW TRANSMITTER
TZA
TC
-
TEMPERATURE ALARM
TEMPERATURE CONTROLLER
TDY
TE
THS
TI
TIC
TIT
TR
TS
TT
TV
TW
TAH
TAHH
TAL
TALL
-
I/P CONVERTOR
TEMPERATURE ELEMENT
TEMPERATURE HAND SWITCH
TEMPERATURE INDICATOR
TEMPERATURE INDICATOR CONTROLLER
TEMPERATURE INDICATOR TRANSMITTER
TEMPERATURE RECORDER
TEMPERATURE SWITCH
TEMPERATURE TRANSMITTER
TEMPERATURE CONTROL VALVE
THERMOWELL
TEMPERATURE ALARM HIGH
TEMPERATURE ALARM HIGH HIGH
TEMPERATURE ALARM LOW
TEMPERATURE ALARM LOW LOW
XA
XE
XHS
XI
XIA
XL/XA
-
STATUS ALARM
MISCELLANEOUS ELEMENT
XT
XV
-
MISCELLANEOUS TRANSMITTER
MISCELLANEOUS ON/OFF VALVE
XXY
-
SOLENOID VALVE
INSTRUMENT SYMBOLS
X
S
TYPICAL
VALVE DWG
SOLENOID OPERATED
VALVE
-
HAND CONTROLLER
HAND CONTROL VALVE
HAND INDICATING CONTROLLER
HAND INDICATING SWITCH
HAND SWITCH
HSO
HSC
-
POSITION COMMAND - (OPEN)
POSITION COMMAND - (CLOSED)
HSP
HST
HV
HY
-
PUMP STOP
PUMP START
SHUT OFF VALVE
I/P CONVERTOR
IE
II
IR
IT
-
CURRENT ELEMENT
CURRENT INDICATOR (AMMETER)
CURRENT RECORDER
CURRENT TRANSMITTER
JI
-
POWER INDICATOR (WATTAGE INDICATOR)
KC
KI
KIC
KT
-
TIME CYCLE CONTROLLER
CLOCK
TIME CYCLE INDICATOR CONTROLLER
TIME-SCHEDULE TRANSMITTER
LC
LCV
LG
LI
LIC
LIT
LQR
LRC
LS
LT
LTC
LV
LY
LXY
LSH
LSHL
LSL
LAH
LAHH
LAL
LALL
-
LEVEL CONTROLLER
LEVEL CONTROL VALVE (SELF ACTUATING)
LEVEL GAUGE
LEVEL INDICATOR
LEVEL INDICATOR CONTROLLER
LEVEL INDICATOR TRANSMITTER
LEVEL TOTALISER RECORDER
LEVEL RECORDING CONTROLLER
LEVEL SWITCH
LEVEL TRANSMITTER
LEVEL TRANSMITTER CONTROLLER
LEVEL CONTROL VALVE
I/P CONVERTOR
LEVEL CONTROL VALVE SOLENOID VALVE
LEVEL SWITCH HIGH
LEVEL SWITCH HIGH AND LOW
LEVEL SWITCH LOW
LEVEL ALARM HIGH
LEVEL ALARM HIGH HIGH
LEVEL ALARM LOW
LEVEL ALARM LOW LOW
PC
PCV
PDA
PDC
PDI
PDIC
PDIS
PDIT
PDS
PDT
PAH
PAHH
PAL
PALL
-
PRESSURE CONTROLLER
PRESSURE CONTROL VALVE (SELF ACTUATING)
PRESSURE DIFFERENTIAL ALARM
PRESSURE DIFFERENTIAL CONTROLLER
PRESSURE DIFFERENTIAL INDICATOR
PRESSURE DIFFERENTIAL INDICATOR CONTROLLER
PRESSURE DIFFERENTIAL INDICATOR SWITCH
PRESSURE DIFFERENTIAL INDICATOR TRANSMITTER
PRESSURE DIFFERENTIAL SWITCH
PRESSURE DIFFERENTIAL TRANSMITTER
PRESSURE ALARM HIGH
PRESSURE ALARM HIGH HIGH
PRESSURE ALARM LOW
PRESSURE ALARM LOW LOW
R
SOLENOID OPERATED VALVE
WITH LOCAL MANUAL RESET
PISTON
OPERATED
VALVE
I
LOGIC INTERLOCK
R
RESET
F&G
FIRE & GAS
ICS
INTEGRATED CONTROL SYSTEM
PCS
PROCESS CONTROL SYSTEM
AIR SUPPLY
AS
HYDRAULIC FLUID SUPPLY
HFS
LOCAL PANEL LIGHT
VALVE
WITH HAND WHEEL
HAND
CONTROL VALVE
HYDRAULIC
CYLINDER TYPE
VALVE (OPENING)
CHECK VALVE
ОЈ
STATUS INDICATOR
CHANGE OF STATUS ALARM
MISCELLANEOUS LIGHT/ALARM
Summing
INSTRUMENT LINE SYMBOLS
FC
CONTROL VALVE
AND FAILURE ACTION
VALVE FAILURE ACTION
HC
HCV
HIC
HIS
HS
S
SHUTDOWN SYSTEM
HYDRAULIC
CYLINDER TYPE
VALVE (OPEN/SHUT)
DIAPHRAGM OPERATED
SELF ACTUATED VALVE
(TAPPING IN ASSOCIATED
PIPEWORK)
PNEUMATIC SIGNAL
ELECTRIC SIGNAL
FC-FAIL CLOSED
FO-FAIL OPEN
FL-FAIL LAST
ZA
ZC
ZE
ZI
ZIH
ZIL
ZIS
ZIT
ZS
ZSH
ZSHL
ZSL
ZT
-
POSITION ALARM
POSITION CONTROLLER
POSITION ELEMENT
POSITION INDICATOR ANALOGUE
POSITION INDICATOR (OPEN)
POSITION INDICATOR (CLOSED)
POSITION INDICATOR SWITCH
POSITION INDICATOR TRANSMITTER
POSITION SWITCH
POSITION SWITCH (OPEN) OR ZSHH
POSITION SWITCH (OPEN/CLOSED)
POSITION SWITCH (CLOSED) OR ZSLL
POSITION TRANSMITTER
CAPILLARY TUBING
FILLED SYSTEM
PSV
PSV
PSV
HYDRAULIC SIGNAL
DATA LINK
PRESSURE
SAFETY VALVE
COMBINED VACUUM RELIEF
& PRESSURE SAFETY VALVE
VACUUM
RELIEF VALVE
PI
FO
PRESSURE
PSE
RESTRICTION
ORIFICE
PSE
ZE
PRESSURE SWITCH LOW.
FUNCTION DESIGNATION FOR RELAYS
RUPTURE DISC
S
SUM (ADD)
DIFFERENCE (SUBTRACT)
BIAS
MULTIPLY
RUPTURE DISC
WITH RUPTURE
DETECTION DEVICE
EXTRACT SQUARE ROOT
F(x)
CHARACTERIZE
1.1
BOOST
HIGH SELECT
LOW SELECT
I/P
CURRENT TO PNEUMATIC
P/I
PNEUMATIC TO CURRENT
E/P
VOLTAGE TO PNEUMATIC
E/I
VOLTAGE TO CURRENT
I/H
CURRENT TO HYDRAULIC
Issued
0
Rev.
Index
Date
Document No. :
Revision Note /
Reason for Issue
Drawn
Checked
???
Piping & Instrument Diagram
Legend
Title :
Project :
Page
1 of 4
Sample Project
Approved
RG-L014-0025
Vapor Main
FC
RG-HV-014
P > Pset
RG-L012-0150
GCU
FC
HH
PIC H
011 L
LL
P < Pset
RG-PCV-012
LD Compressor
/ Export Header
RG-L013-0025
FC
N2
RG-PCV-013
RG-L011-0050
FO
RG-PCV-011
RG-PSV-017
RG-L017-0250
RG-L012-0150
TZA H
011 L
HH
LIC H
001 L
LL
TE
011
PT
011
RG-L022-0300
LS
011
Suction
Drum
RG01V-1
LIT
001
TE
001
Cargo Pump
PI
011
RG-L021-0250
RG-L001-0400
FC
Spray Pump
RG-L002-0080
RG-L015-0200
FC
RG-LCV-001 B
RG-LCV-002
RG-L003-0080
FC
RG-L401-0400
RG-L301-0400
Drain
To Cargo Tank
Train 1
LNG Booster Pump
RG-L225-0150
Train 2
LNG Booster Pump
RG-L325-0150
Train 3
LNG Booster Pump
RG-L425-0150
Train 4
LNG Booster Pump
TE
012
HH
TZA H
012 L
RG-L123-0150
Train 1
LNG Booster Pump
LS
012
LZA
012 LL
RG-L223-0150
Train 2
LNG Booster Pump
RG-L323-0150
Train 3
LNG Booster Pump
RG-L423-0150
Train 4
LNG Booster Pump
RG-L016-0700
RG-LCV-001 A
LZA HH
011
RG-L125-0150
Train 4
Train 3
FO
RG-L127-0025
RG-L227-0025
RG-L337-0025
RG-L447-0025
RG-HV-015
RG-L201-0400
Train 2
Train 1
LNG Booster Pump
Train 3
LNG Booster Pump
Train 4
LNG Booster Pump
Issued
0
Train 2
LNG Booster Pump
Rev.
Index
Train 1
Date
Document No. :
Revision Note /
Reason for Issue
Drawn
Checked
???
RG-L101-0400
Piping & Instrument Diagram
Legend
Title :
Project :
Page
1 of 4
Sample Project
Approved
Document
Category
Education
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