Clarity in writing and drawings should never be sacrificed by using abbreviations. This could lead to a misunderstanding in the meaning. You should always avoid abbreviations in technical writing and on drawings that are going to be distributed to foreign countries.
This list by no means is complete and variations may be found. More abbreviations can be found within the site.
If you do abbreviate, you should follow a few rules:
- Use upper case letters with no periods
- Do not use spaces
- Use the same abbreviation for singular or plural
- See a list of Instrument Abbreviations.
Abbreviations
Number
- 3WV - 3 Way Valve
- 4WV - 4 Way Valve
A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
A
- A/C - Air Conditioning
- A/G - Aboveground
- A/H - After Hours
- A/W, W/A - Air/Water
- A - Ampere
- A - Anchor
- A - Area
- AB - Anchor Bolt
- AB - Asbestos Board
- AB - As-built
- ABD - Abandoned
- ABD LOC - Abandoned Location
- ABD-GW - Abandoned Gas Well
- ABD-OW - Abandoned Oil Well
- ABDOGW - Abandoned Oil and Gas Well
- ABS - Absolute
- ABV - Above
- AC - Acid
- AC - Actinium
- AC - Air Conditioner
- AC - Alternating Current
- ACB - Air Circut Breaker
- ACLD - Air Cooled
- ACLR - Air Cooler
- ACP - Asbestos Cement Pipe
- ACPL - Acoustical Plaster
- ACR - Acrylic
- ACST - Acoustic
- ACT - Automatic Custody Transfer
- AD - Access Door
- AD - Area Drain
- ADD - Addendum
- ADD - Addition
- ADDL - Additional
- ADJ - Adjust
- ADJ - Adjustable
- ADJ - Adjacent
- ADPT - Adapter
- AEC - Architecture, Engineering, and Construction
- AF - Above Floor Level
- AF - Above Finished Level
- AFF - Above Finished Floor
- AFL - Above Finished Level
- AFP - Average Flowing Pressure
- AG - Above Ground
- AG - Silver
- AGG - Aggregate
- AGGR - Aggregate
- AGL - Above Ground Level
- AHD - Australian Height Datum
- AHU - Air Handler Unit
- AI - Instrument Air
- AIC - Amperes Interrupting Circuit
- AIR - Average Injection Rate
- AIR COND - Air Conditioning
- AK - Alaska
- AL - Alabama
- AL - Alarm Low
- AL - Aluminum
- AL - Ames Laboratory
- ALIGN - Alignment
- ALM - Alarm
- ALTN - Alternate
- ALY - Alloy
- AM - Americium
- AMM - Ammeter
- AMT - Amount
- AMP - Ampere
- AMU - Atomic Mass Unit
- ANAL - Analysis
- ANALY - Analyze
- ANGV - Angle Valve
- ANOD - Anodized
- ANT - Antenna
- AP - Access Panel
- AP - Analyzer Test Point
- APPV - Approve
- APPVL - Approval
- APT - Apartment
- APX - Approximate
- AR - Acid Resisting
- AR - Argon
- AR - Arkansas
- ARR - Arrange
- ARR - Arrangement
- AS - Acoustic Sealant
- AS - Arsenic
- AS - Australian Standard
- ASB - Asbestos
- ASC - Above Suspended Ceiling
- ASCII - American Standard Code for Information Interchange
- ASPH - Asphalt
- ASSEM - Assemble
- ASSOC - Association
- ASSOC - Associate
- ASSY - Assembly
- AT - Acoustical Tile
- AT - Asphalt Tile
- AT - Astatine
- ATF - Along Top Flange
- ATM - Atmosphere
- ATTEN - Attenuation
- AU - Gold
- AU - Utility Air
- AUTH - Authorized
- AUTO - Automatic
- AVG - Average
- AW - Acid Waste
- AW - Acid Water
- AWG - American Wire Gauge
- AWT - Automatic Well Test
- AX - Axis
- AZ - Arizona
- AZ - Azimuth
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
B
- B&B - Bell & Bell
- B&F - Bell & Flange
- B&S - Bell & Spigot
- B&S - Brown & Sharp
- B/D - Barrels per Day
- B/L - Bill of Lading
- B/M - Bill of Materials
- B to B - Back to Back
- B - Basin; Bathroom
- B - Boiler
- B - Boron
- B - Burner
- BA - Barium
- BAF - Baffle
- BAL - Balance
- BAL - Ballast
- BAT - Best Available Technology
- BB - Ball Bearing
- BB - Bolted Bonnet
- BB - Bulletin Board
- BBE - Bevel Both Ends
- BBL - Barrel
- BC - Beginning of Curve
- BC - Bolt Circle
- BC - Bolted Cap
- BC - Broom Closet
- BC - Burner Controller
- BD - Board
- BD - Blow Down
- BDN - Bend Down
- BDY - Boundary
- BE - Beryllium
- BE - Bevel End
- BEL - Below
- BQ - Bendable Quality
- BETW - Between
- BEV - Bevel
- BEV - Bevelled
- BF - Blind Flange
- BF - Bold Face
- BFLY - Butterfly
- BFLYV - Butterfly Valve
- BFW - Bevel for Welding
- BH - Bohrium
- BHD - Bulkhead
- BHP - Break Horsepower
- BI - Bismuth
- BK - Berkelium
- BKR - Breaker
- BL - Blower
- BLE - Bevel Large End
- BLR - Boiler
- BLS - Black Liquid Solids
- BM - Beam
- BM - Bench Mark
- BMP - Best Management Practice
- BO - Blow Off
- BOE - Bevel One End
- BOF - Bottom of Foundation
- BOM - Bill of Materials
- BOP - Bottom of Pipe
- BOP - Blowout Preventer
- BOS - Bottom of Steel
- BOT - Bottom
- BP - Base Plate
- BP - Blueprint
- BP - Boiling Point
- BP - Bull Plug
- BP - Bypass
- BP - Bull Plug
- BPD - Barrels per Day
- BPH - Barrels per Hour
- BPL - Bearing Plate
- BPM - Barrels per Minute
- BPS - Barrels per Second
- BR - Brine
- BR - Bromine
- BRG - Bearing
- BRK - Brick
- BRZ - Bronze
- BS - Both Sides
- BS - Backset
- BS - Bluestone
- BSE - Bevel Small End
- BSHG - Bushing
- BSP - British Standard Pipe
- BSPL - Base Plate
- BTFL - Butterfly
- BTFLV - Butterfly Valve
- BTM - Bottom
- BTU - British Thermal Unit
- BTU/HR - BTU per Hour
- BTU/MIN - BTU per Minute
- BTU/SEC - BTU per Second
- BT - Bathtub
- BT - Bolt
- BT - Burner Transmitter
- BTW - Between
- BTWLD - Buttweld
- BUP - Bend Up
- BUTN - Butane
- BUZ - Buzzer
- BV - Ball Valve
- BW - Barrels of Water
- BW - Both Ways
- BW - Burner Probe
- BW - Buttweld
- BWE - Buttweld Ends
- BWPD - Barrels of Water per Day
- BWPH - Barrels of Water per Hour
- BYP - By Pass
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
C
- C/C - Center to Center
- C/E - Center to End
- C/F - Center to Face
- C/L - Center Line
- °C - Degrees Celsius
- C - Calcimine
- C - Carbon
- C - Celsius
- C - Channel
- C - Courses
- C - Curb
- CA - Calcium
- CA - California
- CA - Caustic
- CA - Compressed Air
- CA - Corrosion Allowance
- CAB - Cabinet
- CAD - Computer Aided Design
- CAD - Computer Assisted Drafting
- CAIS - Caisson
- CAP - Capacity
- CAR - Carpet
- CAT - Catalog
- CAV - Cavity
- CC - Corrosion Coupon
- CC - Cubic Centimeter
- CCTV - Closed Circuit Television
- CCW - ‎Counterclockwise
- CD - Cadmium
- CD - Condensate
- CDS - Cold Drawn Steel
- CE - Cerium
- CEL - Cellar
- CEM - Cement
- CENT - Centralizer
- CER - Ceramic
- CF - Californium
- CF - Casing Flange
- CF - Cubic Feet
- CFH - Cubic Feet per Hour
- CFM - Cubic Feet per Minute
- CFS - Cubic Feet per Second
- CFW - Continuous Fillet Weld
- CH OPER - Chain Operator
- CHAM - Chamfer
- CHAN - Channel
- CHS - Circular Hollow Section
- CI - Cast Iron
- CI - Chemical Injection
- CI - Coutour Interval
- CIP - Cast Iron Pipe
- CIR - Circle
- CIR - Circuit
- CHK - Check
- CHKV - Check Valve
- CL - Center Line
- CL - Chlorine
- CLR - Clear
- CLR - Clearance
- CLSD - Closed
- CM - Centimeter
- CM - Curium
- CMTR - Certified Material Test Report
- CNTY - County
- CO2 - Carbon Dioxide
- CO - Cobalt
- CO - Clean Out
- CO - Colorado
- CO - Crude Oil
- COAX - Coaxial
- COL - Column
- COLR - Collar
- CONC - Concentric
- CONN - Connection
- COR - Corner
- CP - Control Point
- CPL - Coupling
- CPVC - Chlorinated Polyvinyl Chloride
- CR - Chromium
- CRES - Corrosion Resistant Steel
- CS - Caesium
- CS - Carbon Steel
- CSC - Car Seal Closed
- CSG - Casing
- CSI - Contractor Supplied and Installed
- CSK - Countersink
- CSO - Car Seal Open
- CT - Connecticut
- CT - Controller
- CTR - Center
- CTRS - Centers
- CTRL - Control
- CTSK - Countersunk
- CTW - ‎Coated and Wrapped
- CTWT - Counterweight
- CU - Copper
- CU FT - Cubic Foot
- CU IN - Cubic Inch
- CU YD - Cubic Yard
- CV - Check Valve
- CW - Clockwise
- CW - Cold Water
- CW - Continuous Weld
- CWP - Cold Working Pressure
- CWP - Circulating Water Pump
- CWR - Condensate Waste Return
- CWS - Condensate Waste Supply
- CWT - Hundred Weight
- CY - Cubic Yard
- CY - Cycle
- CYL - Cylinder
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
D
- D&A - Dry and Abandoned
- D&C - Drill and Complete
- D/D - Day to Day
- DA - Directional Anchor
- DB - Dubnium
- DC - Washington DC
- DD - Design Drawing
- DD - Double Disk
- DE - Delaware
- DEG - Degree
- DI - Ductile Iron
- DIA - Diameter
- DIM - Dimension
- DISCH - Discharge
- DIV - Division
- DN - Diameter Nominal (Metric)
- DN - Down
- DP - Down Pipe
- DP - Drill Pipe
- DPDT - Double Pole Double Throw
- DPM - Drill Pipe Measurement
- DPST - Double Pole Single Throw
- DR - Density Recorder
- DR - Dryer
- DRL - Double Random Length
- DRL - Drill
- DRLD - Drilled
- DRLG - Drilling
- DS - Darmstadtium
- DS - Downspout
- DS - Disconnect Switch
- DS - Door Switch
- DSL - Diesel
- DT - Density Transmitter
- DT - Drain Tile
- DTL - Detail
- DW - Dishwasher
- DWA - Drilling with Air
- DWG - Drawing
- DWGS - Drawings
- DWP - Drywall
- DWP - Painted
- DWV - Drainage, Waste, Vent
- DY - Dysprosium
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
E
- E/E - End to End
- E - East
- E - Enamel
- E - Exhaust
- E - Exchanger
- EA - Each
- EA - Equal Angle (steel)
- EB - Expansion Bolt
- EC - End of Curve
- EC - Exposed Construction
- ECC - Eccentric
- ECP - Exposed Construction Painted
- EEH - Extra Extra Heavy
- EES - Double Extra Strong
- EF - Each Face
- EFW - Electric Fusion Weld
- EH - Extra Heavy
- EL - Elbow
- EL - Elevation
- ELB - Elbow
- ELEC - Electrical
- ELECT - Electrical
- ELEV - Elevation
- EM - Emergency
- EMER - Emergency
- ENAM - Enamel
- ENCL - Enclosure
- ENG - Engineer
- ENGR - Engineer
- EOL - Elbow Olet
- EOM - End of Month
- EOP - End of Pipe
- EOQ - End of Quarter
- EOY - End of Year
- EQ - Equal
- EQUIP - Equipment
- ER - Erbium
- ERW - Electric Resistance Weld
- ES - Einsteinium
- ES - Extra Strong
- ESD - Emergency Shutdown
- EST - Estimate
- EU - Europium
- EW - Each Way
- EW - Electric Weld
- EWB - Electric Water Boiler
- EWC - Electric Water Cooler
- EXCH - Exchanger
- EXIST - Existing
- EXP - Expansion
- EXP - Exposed
- EXPN - Expansion
- EXS - Extra Strong
- EXT - Exterior
- EXT - Extinguish
- EXTR - Extrude
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
F
- F/F - Female to Female
- F/FAB - Field Fabricated
- F&D - Faced and Drilled
- F to F - Face to Face
- F - Filter
- F - Fluorine
- FAB - Fabrication
- FB - Footing Beam
- FBF - Full Barrel Flange
- FBPE - Fusion Bonded Polyethylene
- FC - Fail Closed
- FCV - Flow Control Valve
- FCU - Fan Coil Unit
- FE - Flanged End
- FE - Iron
- FF - Flat Face
- FFL - Finished Floor Level
- FGL - Fiberglass
- FGR - Fiberglass Reinforced
- FH - Flat Head
- FHF - Full Hard Faced
- FIP - Female Iron Pipe
- FIPT - Female Iron Pipe Thread
- FL - Floor Level
- FL - Florida
- FLG - Flange
- FM - Fermium
- FMU - Field Makeup
- FN - Flange Nut
- FND - Foundation
- FO - Fail Open
- FOB - Flat on Bottom
- FOC - Fibre Optic Cable
- FOE - Flange One End
- FOT - Flat on Top
- FPD - Feet per Day
- FPH - Feet per Hour
- FPM - Feet per Minute
- FPS - Feet per Second
- FR - Francium
- FRP - Fiberglass Reinforced Pipe
- FS - Far Side
- FT - Foot
- FTG - Fitting
- FTG - Footing
- FTTG - Fitting
- FW - Field Weld
- FW - Fillet Weld
- FW - Flexible Wedge
- FW - Fresh Water
- FWF - From Web Face (steel)
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
G
- G - Gas
- G - Gram
- G - Guide
- GA - Gallium
- GA - Georgia
- GALV - Galvanized
- GCI - Galvanized Corrugated Iron
- GD - Gadolinium
- GE - Germanium
- GF - Groove Face
- GG - Gigagram
- GIS - Graphic Information System
- GMAW - Gas Metal Arc Welding
- GND - Ground
- GPD - Gallons per Day
- GPH - Gallons per Hour
- GPM - Gallons per Minute
- GPS - Gallons per Second
- GPS - ‎Global Positioning System
- GR - Grade
- GRD - Ground
- GSKT - Gasket
- GT - Gas Turbine
- GTAW - Gas Tungsten Arc Welding
- GV - Gate Valve
- GVL - Gravel
- GW - Gigawatt
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
H
- H2O - Water
- H - Hydrogen
- HAZ - Heat Affected Zone
- HB - Hose Bib
- HBF - Heavy Barrel Flange
- HC - Hand Controller
- HC - Hydrocarbon
- HDL - Handle
- HDR - Header
- HE - Helium
- HF - Hahnium
- HF - Hard Faced
- HF - Hydraulic Fluid
- HG - Mercury
- HGR - Hanger
- HGT - Height
- HI - Hawaii
- HO - Holmium
- HO - Hot Oil
- H.O.A. - Hand-Off-Auto
- H.O.J. - Hand-Off-Jog
- HOR - Horizontal
- HORIZ - Horizontal
- HP - High Pressure
- HP - Horsepower
- HP - Hot Pipe
- HPFS - High Point of the Finished Surface
- HR - Hour
- HS - Hassium
- HT - Height
- HTR - Heater
- HVAC - Heating, Ventilation and Air Conditioning
- HVY - Heavy
- HW - Handwheel
- HW - Hot Water
- HYDRO - Hydro Test
- HX - Heat Exchanger
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
I
- I - Iodine
- IA - Instrument Air
- IA - Iowa
- IBBM - Iron Body Bronze Mounted
- ID - Idaho
- ID - Inside Diameter
- IE - Invert Elevation
- IFA - Issued for Approval
- IFC - Issued for Construction
- IFCR - Issued for Client Review
- IFD - Issued for Design
- IFF - Issued for Fabrication
- IFMP - Issued for Material Purchase
- IFP - Issued for Permit
- IFR - Issued for Review
- IG - Instrument Gas
- IL - Illinois
- IL - Invert Level
- IN - Inch
- IN - Indiana
- IN - Indium
- IO - Inspection Opening
- IP - Intersection Point
- IP - Iron Pipe
- IPS - Iron Pipe Size
- IR - Iridium
- IS&Y - Inside Screw & Yoke
- ISO - International Organization for Standardization
- ISRS - Inside Screw RS
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
J
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
K
- K - Potassium
- KG - Kilogram
- KM - Kilometer
- KR - Krypton
- KS - Kansas
- KW - Kilowatt
- KWH - Kilo Watt Hour
- KY - Kentucky
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
L
- L - Angle
- L - Left
- L - Length
- L - Lighting Panel
- L - Long
- L - Line
- L - Steel Angle
- LA - Landscape
- LA - Lanthanum
- LA - Louisiana
- LACT - Lease Automatic Custody Transfer
- LAD - Ladder
- LAM - Laminate
- LAM - Laminated
- LAN - Local Area Network
- LB - Pound
- LBL - Label
- LC - Locked Closed
- LCD - Liquid Crystal Diode
- LH - Left Hand
- LI - Lithium
- LIB - Library
- LJ - Lap Joint
- LJF - Lap Joint Flange
- LL - Liquid Level
- LL - Live Load
- LNG - ‎Liquid Natural Gas
- LO - Locked Open
- LOC - Locate
- LOL - Lateral Olet
- LPG - Liquid Petroleum Gas
- LR - Lawrencium
- LR - Living Room
- LR - Long Radius
- LS - Limestone
- LS - Loud Speaker
- LU - Lutetium
- LW - Light Weight
- LWC - Light Weight Concrete
- LWNF - Long Weld Neck Flange
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
M
- M - Meter
- MA - Massachusetts
- MANUF - Manufacturer
- MATL - Material
- MAWP - Maximum Allowable Working Pressure
- MAX - Maximum
- MC - Medium Consistency
- MC - Moisture Content
- MCFD - Thousand Cubic Feet per Day
- MCFH - Thousand Cubic Feet per Hour
- MCFM - Thousand Cubic Feet per Minute
- MCFS - Thousand Cubic Feet per Second
- MD - Maryland
- MD - Mendelevium
- MDC - Maximum Detectable Concentration
- MDL - Middle
- ME - Maine
- MF - Male Face
- MFR - Manufacturer
- MG - Magnesium
- MG - Megagram
- MH - Manhole
- MHZ - Megahertz
- MI - Michigan
- MIG - Metal Inert Gas
- MIN - Minimum
- MIP - Male Iron Pipe
- MISC - Miscellaneous
- MJ - Mechanical Joint
- MM - Millimeter
- MMCF - Million Cubic Feet
- MMCFD - Million Cubic Feet per Day
- MMCFH - Million Cubic Feet per Hour
- MMCFM - Million Cubic Feet per Minute
- MMCFS - Million Cubic Feet per Second
- MN - Manganese
- MN - Minnesota
- MO - Missouri
- MO - Molybdenum
- MP - Melting Point
- MPH - Miles per Hour
- MPI - Magnetic Particle Inspection
- MPT - Male Pipe Thread
- MS - Mild Steel
- MS - Mississippi
- MSS - Manufacturers Standardization Society
- MT - Meitnerium
- MT - Montana
- MTO - Material Take Off
- MW - Manway
- MW - Megawatt
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
N
- N - Nitrogen
- N - North
- NA - Sodium
- NACE - National Association of Corrosion Engineers
- NB - Niobium
- NB - Nominal Bore
- NC - North Carolina
- NC - Normally Closed
- ND - Neodymium
- NDE - Non Destructive Examination
- ND - North Dakota
- NE - Nebraska
- NE - Neon
- NE - Northeast
- NEMA - National Electrical Manufactures Association
- NET - Network
- NFPA - National Fire Protection Association
- NG - Natural Gas
- NH - New Hampshire
- NI - Nickel
- NIC - Not in Contact
- NJ - New Jersey
- NM - New Mexico
- NO - Nobelium
- NO - Normally Open
- NO - Number
- NOM - Nominal
- NP - Neptunium
- NPS - Nominal Pipe Size
- NPSC - American Standard Straight Coupling Pipe Thread
- NPSL - American Standard Straight Locknut Pipe Thread
- NPSM - American Standard Straight Mechanical Pipe Thread
- NPTR - American Standard Taper Railing Pipe Thread
- NPT - National Standard Pipe Thread Taper
- NSOP - Not Shown On Plan
- NRS - Non Rising Stem
- NTS - Not to Scale
- NV - Nevada
- NW - Northwest
- NY - New York
- NZS - New Zealand Standard
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
O
- O/W, W/O - Oil/Water
- O - Oxygen
- OD - Outside Diameter
- OH - Ohio
- OK - Oklahoma
- OOS - Out of Service
- OR - Oregon
- OPT - Optional
- OS - Osmium
- OS&Y - Outside Screw & Yoke
- OSHA - Occupational Safety and Health Administration
- OWG - Oil, Well, GAS Pressure
- OXY - Oxygen
- OZ - Ounce
A -
B -
C -
D -
E -
F -
G -
H -
I -
J -
K -
L -
M -
N -
O -
P -
Q -
R -
S -
T -
U -
V -
W -
X -
Y -
Z
P
- P&ID - Piping and Identification Diagram
- P - Phosphorus
- P - Pump
- PA - Pennsylvania
- PA - Protactinium
- PB - Lead
- PB - Pull Box
- PBE - Plain Both Ends
- PCD - Pitch Circle Diameter
- PD - Palladium
- PE - Plain End
- PEB - Plain End Beveled
- PED - Pedestal
- PED - Pressure Equipment Directive
- PERM - Permanent
- PERP - Perpendicular
- PETRO - Petroleum
- PFC - Parallel Flange Channel
- PFD - Process Flow Diagram
- PH - Phase
- PI - Point of Intersection
- PI - Pressure Indicator
- POE - Plain One End
- PL - Pipeline
- PL - Plate
- PL - Property Line
- PLATF - Platform
- PM - Promethium
- PMI - Positive Material Identification
- PNL - Panel
- PNT - Paint
- PO - Polonium
- PO - Purchase Order
- POSN - Position
- PP - Piping
- PP - Power Pole
- PPE - Personal Protection Equipment
- PR - Pipe Rack
- PR - Praseodymium
- PRCS - Permit-required Confined Space
- PROD - Product
- PROJ - Project
- PRPNE - Propane
- PRV - Pressure Reducing Valve
- PS - Pipe Support
- PS - Pump Station
- PSI - Pounds per Square Inch
- PSIA - Pounds per Square Inch Absolute
- PSIG - Pounds per Square Inch Gauge
- PT - Platinum
- PT - Point of Tangent
- PTN - Partition
- PU - Plutonium
- PVC - Polyinyl Chloride
- PVMNT - Pavement
- PW - Pipeway
- PWHT - Post Weld Heat Treatment
- PWR - Power
- PWY - Pipeway
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- QA - Quality Assurance
- QC - Quality Control
- QCS - Quality Control System
- QDRNT - Quadrant
- QTY - Quantity
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R
- R - Range
- RA - Radium
- RAD - Radius
- RB - Rubidium
- RCC - Reinforced Concrete Cement
- RE - Rhenium
- REC - Receiver
- RED - Reducer
- REF - Reference
- REF - Refinery
- REINF - Reinforcement
- RES - Resilient
- REQ - Request
- REQD - Required
- REV - Revision
- REQ'D - Required
- REV - Revision
- RF - Raised Face
- RF - Roof
- RF - Rutherfordium
- RFC - Released for Construction
- RG - Roentgenium
- RH - Relative Humidity
- RH - Rhodium
- RH - Right Hand
- RHS - Rectangular Hollow Section
- RI - Rhode Island
- RIV - River
- RLF - Relief
- RLFV - Relief Valve
- RN - Radon
- RN - Riser Nipple
- RPRT - Report
- RM - Room
- RND - Round
- RO - Restriction Orifice
- RO - Rough Open
- RL - Random Length
- RR - Radiation Recorder
- RR - Railroad
- RS - Rising Stem
- RTJ - Ring Type Joint
- RTM - Routine Test Method
- RU - Ruthenium
- RVT - Rivet
- RWD - Redwood
- RWD - Resilient Wedge Disc
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- S/D - Shutdown
- S/FAB - Shop Fabrication
- S/S - Start/Stop
- S - Sink
- S - South
- S - Sulfur
- SAN - Sanitary
- SAW - Submerged Arc Weld
- SB - Antimony
- SB - Silver Brazed
- SBE - Screwed Both Ends
- SC - Scandium
- SC - South Carolina
- SCFM - Standard Cubic Feet per Minute
- SCHED - Schedule
- SCHEM - Schematic
- SCR - Screw
- SCRB - Scrubber
- SCRD - Screwed
- SCRN - Screen
- SD - Shutdown
- SD - South Dakota
- SDL - Saddle
- SDU - Sanitary Disposal Unit
- SE - Screwed Ends
- SE - Selenium
- SE - Solder End
- SE - Southeast
- SEC - Section
- SF - Socket Flange
- SFD - System Flow Diagram
- SG - Seaborgium
- SGL - Single
- SHR - Shower
- SHS - Square Hollow Section
- SI - Silicon
- SIM - Similar
- SK - Sketch
- SL - Structural Level
- SM - Samarium
- SMAW - Shielded Metal Arc Welding
- SMLS - Seamless
- SOE - Screwed One End
- SOF - Slip-on Flange
- SOL - Socket Olet
- SOP - ‎Standard Operating Procedure
- SOV - Shut Off Valve
- SP - Sample Point
- SP - Set Point
- SP - Sewer Pipe
- SP - Spare
- SP - Spool
- SQ - Square
- SR - Short Radius
- SR - Strontium
- SRL - Single Random Length
- SS or S/S - Stainless Steel
- SSL - Structural Slab Level
- STD - Standard
- STL - Steel
- STOR - Storage
- STR - Strainer
- STRL - Structural
- STRT - Straight
- STRUCT - Structure
- SPLY - Supply
- SUBST - Substitute
- SUBSTA - Substation
- SUCT - Suction
- SUM - Summarize
- SUPSD - Supersede
- SUPT - Superintendent
- SURF - Surface
- SW - Socket Weld
- SW - Solid Wedge Disk
- SW - Southwest
- SW - Switch
- SWE - Socket Weld End
- SWG - Swage
- SWGR - Switchgear
- SWP - Steam Working Pressure
- SYM - Symbol
- SYS - System
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- 3 PH - Three-phase
- TB&S - Top, Bottom and Sides
- T&C - Thread and Couple
- T&G - Tongue and Grove
- T - Tank
- T - Top
- T - Township
- TA - Tantalum
- TAD - Through Air Drying
- TAN - Tangent
- TB - Terbium
- TB - Threaded Bonnet
- TB - Tie Beam
- TBD - To Be Determined
- TBE - Thread Both Ends
- TC - Technetium
- TC - Threaded Cap
- TD - Time Delay
- TDC - Top Dead Center
- TE - Tellurium
- TEMP - Temperature
- TEMP - Temporary
- TFC - Taper Flange Channel
- TH - Thorium
- THD - Thread
- THDF - Threaded Flange
- THK - Thick
- THKNS - Thickness
- TI - Titanium
- TIG - Tungsten Inert Gas
- TIP - Technical Information Paper
- TK - Tank
- TKF - Tank Farm
- TL - Thallium
- TLE - Thread Large End
- TM - Thulium
- TMDL - Total Maximum Daily Load
- TN - Tennessee
- TO - Threads Only
- TOC - Top of Concrete
- TOD - Total Oxygen Demand
- TOE - Thread One End
- TOL - Threaded Olet
- TOL - Tolerance
- TOP - Top of Pipe
- TOR - Tower
- TOS - Top of Soil
- TOS - Top of Steel
- TOS - Top of Support
- TOT - Total
- TOW - Top of Wall
- TPD - Tapped
- TPI - Threads per Inch
- TR - Trace
- TRCG - Tracing
- TRQ - Torque
- TSE - Thread Small End
- TSS -Total Suspended Solid
- TURBO GEN - Turbine Generator
- TW - Thermowell
- TW, TWTR - Treated Water
- TX - Texas
- TYP - Typical
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- U/G - Underground
- U - Uranium
- UA - Unequal Angle (steel)
- UA - Utility Air
- UB - Union Bonnet
- UB - Universal Beam (steel)
- UC - Universal Column (steel)
- UNF - Unfinished
- UG - Underground
- UNO - Unless Noted Otherwise
- UON - Unless Otherwise Noted
- UR - Urinal
- UT - Utah
- UUB - Ununbium
- UUH - Ununhexium
- UUO - Ununoctium
- UUP - Ununpentium
- UUQ - Ununquadium
- UUS - Ununseptium
- UUT - Ununtrium
- UV - Ultra Violet
- UW - Utility Water
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- V/DWG - Vendor Drawing
- V - Valve
- V - Vanadium
- V - Vent
- V - Voltage
- V - Valve
- VA - Virginia
- VAC - Vacuum
- VB - Vacuum Breaker
- VB - Valve Box
- VB - Vortex Breaker
- VD - Vapor Density
- VD - Vibration Dampener
- VENT - Ventilate
- VENT - Ventilation
- VER - Vertical
- VERT - Vertical
- VFD - Variable Frequency Drive
- VIB - Vibrate
- VIB - Vibtating
- VIB - Vibrator
- VF - Vendor Furnished
- VM - Voltmeter
- VN - Vendor
- VP - Vapor Pressure
- VP - Vent Pipe
- VR - Vapor Recovery
- VR - Vibration Recorder
- VR - Voltage Regulator
- VRLY - Voltage Relay
- VS - Vent Stack
- VS - Voltmeter Switch
- VSL, VESS - Vessel
- VSS - Volatile Suspended Solids
- VT - Vermont
- VTA - Vent to Atmosphere
- VTF - Vent to Flare
- VTX - Vertex
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- W/ - With
- W/A, A/W - Water/Air
- W/O, O/W - Water/Oil
- W/O - Without
- W - Tungsten
- W - Watt
- W - West
- WA - Washington
- WAN - Wide Area Network
- WB - Welded Beam (steel)
- WC - Water Column
- WC - Water Closet (toilet)
- WC - Weight Controller
- WC - Welded Column (steel)
- WCS - Wrought Carbon Steel
- WC(P) - Water Closet With 'P' Trap
- WC(S) - Water Closet With 'S' Trap
- WD - Working Drawing
- WD - Width
- WF - Wide Flange
- WG - Water Gas
- WHSE - Warehouse
- WI - Wisconsin
- WI - Wrought Iron
- WIN - Window
- WKW - Walkway
- WL - Water Line
- WL - Wide Load
- WM - Wire Mesh
- WM - Water Meter
- WM - Washing Machine
- WN or WNK - Weld Neck
- WNF - Weld Neck Flange
- WNK or WN - Weld Neck
- WOE - Weld One End
- WOG - Water Oil or Gas
- WOL - Weld Olet
- WP - Warm Pipe
- WP - Waste Pipe
- WP - Water Proof
- WP - Water Pump
- WPA - Water Proof Adhesive
- WPR - Waterproofing
- WPR - Working Pressure
- WPS - Welding Procedure Specification
- WPQ - Welder Performance Qualification
- WRA - Water Resistance Adhesive
- WSD - Working Stress Design
- WSP - Working Steam Pressure
- WT - Wall Thickness
- WT - Weight
- WTHPRF - Weatherproof
- WTR - Water
- WTRPRF - Waterproof
- WV - West Virginia
- WW - Waste Water
- WW - Well Water
- WWP - Working Water Pressure
- WWTR - Waste Water
- WY - Wyoming
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- XE - Xenon
- XH - Extra Heavy
- XS - Extra Strong
- XXH - Extra Extra Heavy
- XXS - Double Extra Strong
- XXS - Extra Extra Strong
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