INSTRUMENT IDENTIFICATION LETTERS
INSTRUMENT SYMBOLS
PIPING SYMBOLS
VALVE SYMBOLS
ALARM ANALYZER
ALARM ANALYZER HIGH
ANALYSIS CONTROLLER
ANALYSIS ELEMENT
ANALYSIS ELEMENT TRANSMITTER
ANALYSIS INDICATOR
ANALYSIS INDICATING CONTROLLER
ANALYSIS POINT
ANALYSIS TRANSMITTER
FIRE ALARM HIGH
FIRE ELEMENT
BTU INDICATOR
FIRE DETECTOR SWITCH
FIRE DETECTOR SWITCH HIGH
DENSITY (OR SPECIFIC GRAVITY) ELEMENT
DENSITY (OR SPECIFIC GRAVITY) INDICATOR
DIFFERENTIAL PRESSURE INDICATOR
DENSITY (OR SPECIFIC GRAVITY) RECORDER
DENSITY (OR SPECIFIC GRAVITY) TRANSMITTER
EMERGENCY SHUT DOWN
FLOW ALARM
FLOW ALARM HIGH
FLOW ALARM HIGH HIGH
FLOW CONTROLLER
FLOW CONTROL VALVE
FLOW ELEMENT
FLOW INDICATOR SIGHT GLASS
FLOW INDICATOR
FLOW INDICATING CONTROLLER
FLOW INDICATING SWITCH
FLOW INDICATING TRANSMITTER
FLOW MANUAL CONTROL
RESTRICTION ORIFICE
FLOW TOTALIZER
FLOW TOTALIZING INDICATOR
FLOW QUANTITY INDICATOR SWITCH
FLOW TOTALIZING RECORDER
FLOW RECORDER
FLOW RECORDING CONTROLLER
FLOW SWITCH
FLOW SWITCH HIGH
FLOW SWITCH HIGH HIGH
FLOW TRANSMITTER
FLOW CONTROL VALVE
FLOW COMPUTER OR RELAY
HAND CONTROL
HAND CONTROL VALVE
HAND INDICATING CONTROLLER
HAND MOTOR SWITCH
HAND SWITCH
HAND SWITCH CLOSE
HAND SWITCH OPEN
HAND VALVE
LEVEL ALARM
LEVEL ALARM LOW
LEVEL ALARM HIGH
LEVEL ALARM HIGH HIGH
LEVEL CONTROLLER
LEVEL CONTROL SWITCH
LEVEL CONTROL VALVE
LEVEL GAUGE GLASS
LEVEL MANUAL CONTROL
LEVEL INDICATOR (OTHER THAN LG)
LEVEL INDICATING CONTROLLER
LEVEL INDICATING TRANSMITTER
LEVEL RECORDER
LEVEL SWITCH
LEVEL SWITCH HIGH
LEVEL SWITCH HIGH HIGH
LEVEL TRANSMITTER
LEVEL CONTROL VALVE
LEVEL RELAY
MOISTURE ALARM
MOISTURE ELEMENT
MOISTURE CONTROLLER
MOISTURE ANALYZER / TRANSMITTER
MOTOR OPERATED VALVE
MOISTURE RECORDER
MOISTURE SWITCH
MOISTURE TRANSMITTER
PRESSURE ALARM
PRESSURE ALARM HIGH
PRESSURE ALARM HIGH HIGH
PRESSURE CONTROLLER
PRESSURE CONTROL VALVE
PRESSURE DIFFERENTIAL ALARM HIGH
PRESSURE DIFFERENTIAL INDICATOR
PRESSURE DIFFERENTIAL INDICATING CONTROLLER
PRESSURE DIFFERENTIAL INDICATING SWITCH
PRESSURE DIFFERENTIAL INDICATING TRANSMITTER
PRESSURE DIFFERENTIAL RECORDER
PRESSURE DIFFERENTIAL SWITCH
PRESSURE DIFFERENTIAL SWITCH HIGH
PRESSURE DIFFERENTIAL SWITCH HIGH HIGH
PRESSURE DIFFERENTIAL TRANSMITTER
PRESSURE MANUAL CONTROL
PRESSURE INDICATOR
PRESSURE INDICATING CONTROLLER
PIT
PR
PRC
PS
PSE
PSH
PSHH
PSL
PSLL
PSV
PT
PVRV
PRESSURE INDICATING TRANSMITTER
PRESSURE RECORDER
PRESSURE RECORDING CONTROLLER
PRESSURE SWITCH
RUPTURE DISK
PRESSURE SWITCH HIGH
PRESSURE SWITCH HIGH HIGH
PRESSURE SWITCH LOW
PRESSURE SWITCH LOW LOW
PRESSURE SAFETY / RELIEF VALVE
PRESSURE TRANSMITTER
PRESSURE VACUUM RELIEF VALVE
PY
SE
SI
SS
ST
SY
TA
TAH
TAHH
TC
TCV
TE
THC
TI
TIC
TIT
TQI
TR
TS
TSH
TSHH
TT
TV
TW
VA
VAH
VAHH
VI
VS
VT
XA
XC
XP
XS
YC
ZI
ZIS
ZIC
ZIO
ZL
ZLC
ZLO
ZSC
ZSO
ZT
PRESSURE RELAY
TACHOMETER PICKUP
TACHOMETER
SPEED SWITCH
SPEED TRANSMITTER
SPEED RELAY
TEMPERATURE ALARM
TEMPERATURE ALARM HIGH
TEMPERATURE ALARM HIGH HIGH
TEMPERATURE CONTROLLER
TEMPERATURE CONTROL VALVE (SELF-CONTAINED)
TEMPERATURE ELEMENT (W / THERMOWELL)
TEMPERATURE MANUAL CONTROL
TEMPERATURE INDICATOR
TEMPERATURE INDICATING CONTROLLER
TEMPERATURE INDICATING TRANSMITTER
TEMPERATURE AVERAGER
TEMPERATURE RECORDER
TEMPERATURE SWITCH
TEMPERATURE SWITCH HIGH
TEMPERATURE SWITCH HIGH HIGH
TEMPERATURE TRANSMITTER
TEMPERATURE CONTROL VALVE OR LOUVER
THERMOWELL
VIBRATION ALARM
VIBRATION ALARM HIGH
VIBRATION ALARM HIGH HIGH
VIBRATION INDICATOR
VIBRATION SWITCH
VIBRATION TRANSMITTER
RECORDER MEMORY ALARM
SHUTDOWN CONTROLLER
ANNUNCIATOR POINT
PROVER DETECTOR SWITCH
SEQUENCE CONTROLLER
PIG SIGNAL
PIG SIGNAL SWITCH
VALVE POSITION INDICATOR (CLOSED)
VALVE POSITION INDICATOR (OPEN)
VALVE POSITION
VALVE POSITION INDICATOR LAMP (CLOSED)
VALVE POSITION INDICATOR LAMP (OPEN)
VALVE POSITION INDICATOR SWITCH (CLOSED)
VALVE POSITION INDICATOR SWITCH (OPEN)
VALVE POSITION TRANSMITTER
ALARMS, SWITCHES, AND ANNUNCIATORS MAY HAVE SUFFIX LETTERS
AS FOLLOWS:
L
LOW
DENOTES ALARM ONLY
LL
EXTRA LOW
DENOTES SHUTDOWN
H
HIGH
DENOTES ALARM ONLY
HH
EXTRA HIGH
DENOTES SHUTDOWN
LOCAL INSTRUMENT
INSTRUMENT MOUNTED ON PANEL
(PRIMARY FRONT)
BALL VALVE
QUICK CONNECT
PLUG VALVE
FIELD WELD
GLOBE VALVE
INSTRUMENT MOUNTED ON PANEL
(AUXILIARY FRONT)
INSTRUMENT MOUNTED BEHIND PANEL
(AUXILIARY BACK)
WELD CAP
CHECK VALVE
BLIND FLANGE
NEEDLE VALVE
FLANGES
BUTTERFLY VALVE
UNION
BUTTERFLY CHECK VALVE
SPECTACLE BLIND (OPEN)
INSTRUMENT FOR TWO FUNCTIONS
OR TWO MEASURED VARIABLES
GATE VALVE DBB
SPECTACLE BLIND (CLOSED)
PROGRAMMABLE LOGIC CONTROL
(LOCAL)
BALL VALVE DBB
PADDLE BLIND (OPEN)
STATION PROGRAMMABLE LOGIC CONTROL
(PRIMARY FRONT)
PLUG VALVE DBB
PADDLE BLIND (CLOSED)
STATION PROGRAMMABLE LOGIC CONTROL
(PRIMARY BACK)
INSULATING FLANGE ASSEMBLY
GATE DIAPHRAGM CONTROL VALVE
INSULATING UNION ASSEMBLY
BALL DIAPHRAGM CONTROL VALVE
STATION PROGRAMMABLE LOGIC CONTROL
(AUXILIARY FRONT)
BUTTERFLY DIAPHRAGM CONTROL VALVE
BLEED RING OR TEST INSERT
GATE MOTOR CONTROL VALVE
RUPTURE DISC
SHARED DISPLAY, SHARED CONTROL
(PRIMARY FRONT)
GLOBE MOTOR CONTROL VALVE
FLAME ARRESTOR
SHARED DISPLAY, SHARED CONTROL
(PRIMARY BACK)
BALL MOTOR CONTROL VALVE
LIGHT
(LOCAL)
HEAT TRACED
UNDEFINED
T
ATM
ATMOSPHERE
CSC
CAR SEAL CLOSED
CSO
CAR SEAL OPEN
FC
FAIL CLOSED
FL
FAIL IN LAST POSITION
FO
FAIL OPEN
LC
LOCK CLOSED
LO
LOCK OPEN
MCC
MOTOR CONTROL CENTER
PD
POSITIVE DISPLACEMENT
R
RESET
RA
REVERSE ACTING
RTD
RESISTANCE TEMPERATURE DET.
RTU
REMOTE TERMINAL UNIT
SP
SET POINT
TMS
TERMINAL MANAGEMENT SYSTEM
PIPING SPECS
A = ANSI 150
B = ANSI 300
C = ANSI 600
D = ANSI 900
E = ANSI 1500
INSULATION DESIGNATIONS
C = COLD SERVICE
H = HOT SERVICE
P = PERSONNEL
S = SPECIAL
ST = STEAM TRACED
ET = ELECTRIC TRACED
EQUIPMENT DESIGNATIONS
A = AGITATOR
B = BLOWER
C = COMPRESSOR
D = DRUM
E = EXCHANGER
F = FILTER
M = MOTOR
P = PUMP
PM = PUMP MOTOR
PR = PROVER
T = TOWER
TK = TANK
SIGHT GLASS
COMPUTER FUNCTION
(LOCAL)
n
ROOT EXTRACTION
P
ULTRASONIC METER
DOMED ROOF TANK
SLOPED ROOF TANK
AGITATOR W/ MOTOR
SUPER EXCHANGER
HORIZONTAL
PUMP
VERTICAL
IN-LINE PUMP
EXTERNAL FLOATING
ROOF TANK
OPEN TANK
VERTICAL VESSEL
WITH SKIRT
BULLET VESSEL
SINGLE END EXCHANGER
POSITIVE DISPLACEMENT
PUMP
SUMP
PUMP
DEEP WELL
PUMP
EYE WASH STATION
RAILCAR
TRUCK
VORTEX METER
PRESSURE SAFETY VALVE
ORIFICE
P
CURRENT TO PNEUMATIC TRANSDUCER
I
PNEUMATIC TO CURRENT TRANSDUCER
PRESSURE VACUUM RELIEF VALVE
STRAIGHTENING VANES
ANGLE VALVE
R
E
I
RESISTANCE TO CURRENT TRANSDUCER
I
VOLTAGE TO CURRENT TRANSDUCER
STRAIGHTENING PLATE
3-WAY VALVE
MISCELLANEOUS SYMBOLS
TP
XX
CONCENTRIC REDUCER
4-WAY VALVE
TIE POINT NUMBER
ECCENTRIC REDUCER
(FSD = FLAT SIDE DOWN)
(FSU = FLAT SIDE UP)
REVISION NUMBER
1"x1"
TEMPORARY STRAINER
PROJECT LIMIT
CUPON HOLDER
SPEC. BREAK.
EXPANSION JOINT
DRAIN, SAMPLE, VENT
FLEX HOSE FLANGE WITH
QUICK CONNECT
ATMOSPHERE
PRESSURE INDICATOR
PRESSURE SAFETY
VALVE
SONIC GUIDED
BINARY PNEUMATIC
PIG LAUNCHER
W/ CON REDUCER
ELECTROHYDRAULIC GLOBE CONTROL VALVE
MECHANICAL LINK
CAPILLARY
PIG LAUNCHER
W/ ECC REDUCER
TURBINE METER
HIGH SIGNAL SELECT
I
PIG RECEIVER
W/ CON REDUCER
POSITIVE DISPLACEMENT METER
PRESSURE CONTROL VALVE
WITH DUAL SOLENOIDS
TOTALIZE
PIG RECEIVER
W/ ECC REDUCER
CORIOLIS METER
PRESSURE CONTROL VALVE
WITH SINGLE SOLENOID
RELAY FUNCTIONS
S
STANDARD EQUIPMENT SYMBOLS
STEAM TRAP
PRESSURE CONTROL VALVE (SELF)
ELECTRICAL
HYDRAULIC LINE
LINE NUMBER
(NOT ALL SHOWN)
SYSTEM
PNEUMATIC
FROM/TO DRAWING NUMBER
SOLENOID VALVE
NEW UTILITY PIPING
INSTRUMENT/TUBING
LINE NUMBER
LINE SERVICE DESIGNATIONS
BASKET STRAINER
LIGHT
(PRIMARY BACK)
LINE SYMBOLS
EXISTING UTILITY
TO/FROM DRAWING NUMBER
DBB MOTOR CONTROL VALVE
LIGHT
(PRIMARY FRONT)
SHUTDOWN (SPECIFIC SEQUENCE)
EXISTING PROCESS LINES
LINE NUMBER
Y STRAINER
EXAMPLE
NEW PROCESS PIPING
MISC. ABBREVIATIONS
TO DRAWING NUMBER
STATION PROGRAMMABLE LOGIC CONTROL
(AUXILIARY BACK)
LOW SIGNAL SELECT
COMPLEX OR UNDEFINED INTERLOCK
TRACING
INSULATION
SPECIFICATION
LINE NUMBER
SERVICE DESIGNATION
NOMINAL PIPE SIZE
FACILITY DESIGNATION OR AREA CODE
(SEE DDSP-03)
INSTRUMENT MOUNTED BEHIND PANEL
(PRIMARY BACK)
SHUTDOWN
OUTPUT IF ANY INPUT(S) PRESENT
FROM DRAWING NUMBER
LINE NUMBER
INTERLOCK LOGIC
OUTPUT ONLY IF ALL INPUTS PRESENT
CONTINUATION FLAGS
OLET
GATE VALVE
AA
AAH
AC
AE
AET
AI
AIC
AP
AT
BAH
BE
BI
BS
BSH
DE
DI
DPI
DR
DT
ESD
FA
FAH
FAHH
FC
FCV
FE
FG
FI
FIC
FIS
FIT
FHC
FO
FQ
FQI
FQIS
FQR
FR
FRC
FS
FSH
FSHH
FT
FV
FY
HC
HCV
HIC
HMS
HS
HSC
HSO
HV
LA
LAL
LAH
LAHH
LC
LCS
LCV
LG
LHC
LI
LIC
LIT
LR
LS
LSH
LSHH
LT
LV
LY
MA
ME
MC
MNT
MOV
MR
MS
MT
PA
PAH
PAHH
PC
PCV
PDAH
PDI
PDIC
PDIS
PDIT
PDR
PDS
PDSH
PDSHH
PDT
PHC
PI
PIC
LINE IDENTIFICATION
RAIL
FC
FLEX HOSE FLANGED
FOAM CHAMBER
BINARY ELECTRIC
VENDOR LIMITS
DEMO
NEW
CW_00317
Energy L.P.
HOLD
WC_00247
Energy L.P.
HOLD
WC_00247
Energy L.P.
WC_00247
Energy L.P.
CW_00247
Energy L.P.
WC_00247
Energy L.P.
STOT-8"-RD-396-A
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.
WC_00247
Energy L.P.