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Valve Tag Standard Abbreviations

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The following are abbreviations you may see used on valve tags as defined by the ASME Code.

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ABED Aux.
Building Equip. Drains
ABEDT Aux.
Building Equip. Drain Tank
ABFD Aux.
Building Floor Drain
ABFDT Aux.
Building Floor Drain Train
ACB
Air Circuit Breaker
ACK
Acknowledge
ACT
Actuate
ADJ
Adjust
AFW
Auxiliary Feedwater
ALM
Alarm
AMB
Ambient
ANAL
Analyzer
AO(V)
Air Operated (Valve)
AVG
Average
BA
Boric Acid
BAR
Bar Graph
BAT
Boric Acid Tank / Battery
BD
Blow Down
BIST
Bistable
BIT
Boron Injection Tank
BKR
Breaker
BL
Black Liquid
BOP
Balance of Plant
BTM
Bottom
BTU
British Thermal Unit
BUP
Backup
C
Centigrade (aka. Celsius)
C/CB
Condensate / Cond. Booster
C1M
Cumulative One Minute
CAB
Cabinet
CAL
Calibration / Calorie
CAUS
Cause
CCW
Component Cooling Water / Closed Cooling Water
CD
Condensate
CDB
Condensate Booster
CDT
Chemical Drain Tank
CHAM
Chamber
CHAN
Channel
CHNG
Change
CHRG
Charging
CJB
Cold Junction Box
CKT
Circuit
CL
Cold Leg
CLNG
Cooling
CMPT
Computed
CNMT
Containment
COM
Common
COMP
Component
CONC
Concentration
COND
Condenser / Condensate
CONDTY
Conductivity
CONT
Controller
CONT
ROD Control Rod
CONTR
Control
COR
Correction
CORR
Correlation
COUNT
Count
CPM
Counts Per Minute
CPU
Central Processing Unit
CPUS
Central Processing Units
CR
Control Room
CRB
Chemical Recovery Boiler
CROM
Control Rod Drive Mechanism
CS
Containment Spray
CSR
Cable Spreading Room
CST
Condensate Storage Tank
CW
Circulating Water
CWP
Circulating Water Pump
CYL
Cylinder
D/G
Diesel Generator
DEG
Degrees
DEMIN
Demineralizer
DET
Detector
DEV
Deviation
DIV
Division
DO
Diesel Fuel Oil
DOT
Dirty Oil Tank
DSCH
Discharge
DT
Delta Temperature
ECCS
Emergency Core Cooling System
EDT
Equipment Drain Tank
EFCT
Effect
EFLNT
Effluent
EHC
Electro Hydraulic Control
ELEC
Electrical
EQ
Equipment
EQUIP
Equipment
ES
Extraction Steam
ESF
Engineered Safety Feature
ESS
Essential Service
EXH
Exhaust / Exhauster
EXPANS
Expansion
EXTR
Extracted Extractor / Extraction
F
Fahrenheit
FCV
Flow Control Valve
FD
Forced Draft
FH
Fuel Handling
FLW
Flow
FO
Fuel Oil
FREQ
Frequency
FRNT
Front
FW
Feed Water
GOV
Governor
GPM
Gallons Per Minute
GRP
Group
GSC
Gland Steam Condenser
GV
Governor Valve
HG(A)
Mercury (absolute)
HGHT
Height
HIDP
High Differential Pressure
HL
Hot Leg
HOV
Hydraulic Operated Valve
HP
High Pressure
HR(S
) Hour
HRSG
Heat Recovery Steam Generator
HT
RT Heat Rate
HTNG
Heating
HU/CD
Heatup/Cooldown
HUT
Hold up Tank
HYD
Hydraulic
I/P
Current to Pressure
I/V
Current to Voltage
IA
Instrument Air
ID
Identification / Inside Diameter
INBO
Inboard
INC
Increase
INF
Influent
INIT
Initial
INL
Inlet
INSERTIN
Insertion
INST
Instrument / Instantaneous
INT
Internal
INTERM
Intermediate
IOD
Iodine
ISOL
Isolation
JUNCT
Junction
K
Kilo
LNG
Long / Liquified Natural Gas
LO
FLW Low Flow
M/G
Motor Generator Sets
MAINT
Maintenance
MAX
Maximum
MCR
Main Control Room
MFP
Main Feed Pump
MIN
Minutes / Minimum
MOIST
Moisture
MPH
Miles Per Hour
MPS
Miles Per Second
MS
Main Steam / Moisture Separator
MSIV
Main Steam Isolation Valve
MSR
Moisture Separator Reheater
MTR
Motor
MU
Makeup
MVBL
Moveable
NAOH
Sodium Hydroxide
NAR
Narrow
NAR
RNG Narrow Range
NBL
Noble
NEG
Negative
NEUT
Neutron
NIS
Nuclear Instrumentation System
NR
Narrow Range
NUC
Nuclear
OG
Off-Gas
OOS
Out of Service
OP
Over Pressure
OPER
Operator / Operating
OT
Over Temperature
OT-OP
Over Temp-Over Pressure
OUT
Output
OUTBD
Outboard
OUTLT
Outlet
OVERLD
Overload
OVERTEMP
Over Temperature
OVRPWR
Overpower
PART
Partial
PARTIC
Particulate
PCT
Percent
PCV
Pressure Control Valve
PENET
Penetration
PMG
Permanent Magnet Generator
PNEU
Pneumatic
PORV
Power Operated Relief Valve
POS
Positive
POST
Position
POT
Potentiometer
PPB
Parts per Billion
PPM
Parts per Million
PR58
Process Radiation Monitor 58
PREAMP
Preamplifiers
PRG
Purge
PRI
Primary
PROC
Process
PRT
Pressurizer Relief Tank
PS
Power Supply
PSI
Lbs Per Square Inch
PSIA
Lbs Per Square Inch Absolute
PSIG
Lbs Per Inch Gauge
PSIO
Lbs Per Square Inch Differential
PT
Point
PTL
Pull-To-Lock
PUL
Pulverizer
PW
Primary Water
PWR
RNG Power Range
PRV
Pressure Relief Valve
PZR
Pressurizer Relief Tank
RC
Reactor Coolant
RCDT
Reactor Coolant Drain Tank
RCFC
Reactor Containment Fan Cooler
RCL
Reactor Coolant Loop
RCS
Reactor Coolant System
RDT
Reheater Drain Tank
RECOMB
Recombiner
REGEN
Regenerative
REL
Relative
RESID
Residual
RH
Residual Heat
RHR
Residual Heat Removal
RHT
Reheat
RLY
Relay
RNG
Range / Running
ROC
Rate of Change
RTD
Resistance Temp. Detector
RTN
Return
RVLIS
Reactor Vessel Level Indication System
RW
Radwaste
RWST
Refueling Water Storage Tank
S/G
Steam Generator
SA
Service Air
SB
Service Building
SEC
Second
SEL
Select
SEP
Separator
SERV
Service
SFP
Service Fuel Pump
SGTR
Steam Generator Tube Rupture
SI
Safety Injection
SPEC
Specification
STDY
Steady
STNBY
Standby
STOR
Storage
SUPPR
Suppressed
SUPRESS
Suppression
SW
Service Water / Switch
SWST
Secondary Water Storage Tank
T/C
Thermocouples
TAMB
Temperature Ambient
TAVG
Average Temperature
TB
Turbine Building / Terminal Box/Block
TC
Cold Leg Temperature
TCV
Temperature Control Valve
TD
Turbine Drain
TG
Turbine Generator
THER
Thermal
THRT
Throttle
THST
Thrust
TREP
Reference Temperature
TRNA
Train A (B, C, etc.)
TRNSNT
Transient
TRP
Trip
TTD
Terminal Temp. Difference
TURBS
Turbines
UNCONT
Uncontrolled
VAC
Vacuum
VALS
Values
VAP
Vapor
VAR
Variance
VCT
Volume Control Tank
VIB
Vibration
VNT
Vent
VOL
Volume
WR
Wide Range
XFR
Transfer
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