Abbreviated Pipeline Terms and Acronyms
Abbreviated Pipeline Terms and Acronyms
| Abbreviation | Description |
| AARH | Arithmetic Average Roughness Height |
| AG | Above Ground |
| AL | Aluminum |
| ATM | Atmosphere |
| AVG | Average |
| B&S | Bell & Spigot |
| BB | Bolted Bonnet |
| BBE | Bevel Both Ends |
| BC | Bolt Circle |
| BD | Blow Down |
| BE | Beveled End |
| BF | Blind Flange |
| BHN | Brinell Hardness Number |
| BL | Battery Limit |
| BLD | Blind |
| BLE | Bevel Large End |
| BOE | Bevel One End |
| BOM | Bill of Material |
| BOP | Bottom of Pipe |
| BR | Bronze |
| BSE | Bevel Small End |
| BTM | Bottom |
| BW | Butt Weld |
| BYP | Bypass |
| C | Centigrade; Celsius |
| C-C | Center to Center |
| CA | Corrosion Allowance |
| CALC | Calculated |
| CC | Chemical Cleanout |
| CI | Cast Iron |
| CL | Centerline |
| CLR | Centerline Radius |
| CM | Centimeter |
| CO | Cleanout |
| CONC | Concentric |
| CONN | Connection |
| CPLG | Coupling |
| CPM | Computational Pipeline Monitoring |
| CPVC | Chlorinated Polyvinyl Chloride |
| CR | Chromium |
| CS | Carbon Steel |
| CSC | Car Seal Closed |
| CSO | Car Seal Open |
| CTR | Center |
| CU | Copper |
| CVN | Charpy V-notch |
| CW | Continuous Welded |
| CWO | Chain Wheel Operator |
| CWP | Cold Working Pressure |
| DEG | Degree |
| DES | Design |
| DF | Design Factor |
| D/P | Differential Pressure |
| DI | Ductile Iron |
| DIA | Diameter |
| DIM | Dimension |
| DIN | Deutsches Institut für Normung |
| DN | Diameter Nominal (Metric) |
| DP | Design Pressure |
| DRN | Drain |
| DSAW | Double Submerged Arc Welding |
| DT | Design Temperature |
| DWG | Drawing |
| DWT | Drop Weight Tear |
| DWTDWG | Drop Weight Tear Drawing |
| EA | Each |
| EB | Extended Bonnet |
| EC | Eddy Current Testing (Examination) |
| ECC | Eccentric |
| ECDS | External Corrosion Direct Assessment |
| EFRD | Emergency Flow Restricting Device |
| EFW | Electric Fusion Welded |
| EL | Elevation |
| ELL | Elbow |
| ELLIP | Elliptical |
| EMI | Electro-Magnetic Inspection |
| EOL | Elbolet |
| EPDM | Ethylene-Propylene-Diene Terpolymer/EP Rubber |
| EQ | Equal |
| ERW | Electric Resistance Welded |
| ESD | Emergency Shutdown |
| EW | Electric Welded Process |
| F | Fahrenheit |
| F-F | Face-to-Face |
| FBE | Flange Both Ends |
| FCAW | Flux Cored Arc Welding |
| FEP | Perfluoro (Ethylene-Propylene) Copolymer |
| FF | Flat Face |
| FFW | Field Fit Weld |
| FIG | Figure |
| FIN | Finish |
| FLE | Flange Large End |
| FLEX | Flexible |
| FLG | Flange |
| FMU | Fitting Make Up |
| FNPT | Female National (Taper) Pipe Threads |
| FOB | Flat on Bottom |
| FOE | Flange One End |
| FOF | Face of Flange |
| FOT | Flat on Top |
| FP | Full Port |
| FRP | Fiberglass Reinforced Plastic |
| FS | Forged Steel |
| FSE | Flange Small End |
| FT | Foot; Feet |
| FTG | Fitting |
| FV | Full Vacuum |
| FW | Field Weld |
| G | Gram |
| GA | Gauge |
| GALV | Galvanized |
| GBE | Groove Both Ends |
| GE | Groove End |
| GJ | Ground Joint |
| GLE | Groove Large End |
| GMAW | Gas Metal Arc Welding |
| GO | Gear Operator |
| GOE | Groove One End |
| GR | Grade |
| GRND | Ground(ed) |
| GRP | Glass Reinforced Plastic |
| GSE | Groove Small End |
| GSKT | Gasket |
| GTAW | Gas Tungsten Arc Welding |
| H | Horizontal |
| HAZ | Heat Affected Zone |
| HB | Hardness Brinell Scale |
| HD | Head |
| HDPE | High Density Polyethylene |
| HB | Hardness Brinell Scale |
| HDR | Header |
| HEX | Hexagonal |
| HF | Hard Faced |
| HFW | High Frequency Welding |
| HK | Hardness Knoop Scale |
| HIC | Hydrogen Induced Cracking |
| HP | High Pressure |
| HPT | High Point |
| HR15N | Hardness Rockwell 15N Scale |
| HRB | Hardness Rockwell B Scale |
| HRC | Hardness Rockwell C Scale |
| HT | Heat Treatment |
| HV | Hardness Vickers Scale |
| HVL | Highly Volatile Liquid |
| HW | Handwheel |
| IBBM | Iron Body Bronze Mounted |
| ICDIA | Internal Corrosion Direct Assessment |
| ID | Inside Diameter |
| ILI | In-Line Inspection |
| IN | Inch |
| INS | Insulation |
| ISBL | Inside Battery Limits |
| ISO | Isometric Drawing |
| ISRS | Inside Screw Rising Stem |
| ITCS | Impact Tested Carbon Steel |
| JE | Joint Efficiency |
| KCS | Killed Carbon Steel |
| KG | Kilogram |
| KPA | Kilopascals (Pressure = psig x 6.895) |
| LB | Large Bore |
| LDPE | Low Density Polyethylene |
| LFW | Low Frequency Welding |
| LJ | Lap Joint |
| LP | Low Pressure |
| LPG | Liquefied Petroleum Gas |
| LPT | Low Po int |
| LR | Long Radius |
| LTE | Long Tangent Elbow |
| LW | Laser Welded Process |
| LWN | Long Welding Neck |
| M | Meter |
| MxF | Male by Female |
| MAOP | Maximum Allowable Operating Pressure |
| MAWP | Maximum Allowable Working Pressure |
| MAX | Maximum |
| MDMT | Minimum Design Metal Temperature |
| MFG | Manufacturer |
| MI | Malleable Iron |
| MIC | Microbiologically Induced Corrosion |
| MIN | Minimum |
| MISC | Miscellaneous |
| MJ | Mechanical Joint |
| MNPT | Male National (Taper) Pipe Threads |
| MO | Molybdenum |
| MOP | Maximum Operating Pressure |
| MPQ | Manufacturing Procedure Qualification |
| MPQT | Manufacturing Procedure Qualification Testing |
| MPS | Manufacturing Procedure Specification |
| MT | Magnetic Particle Testing (Exam) |
| MTL | Material |
| MTO | Material Take Off |
| MTR | Material Test Report |
| N | Normalized |
| N/A | Not Applicable |
| NBR | Nitrile-Butadiene/Nitrile or Buna N Rubber |
| NDE | Nondestructive Examination |
| NI | Nickel |
| NIPP | Nipple |
| NOZ | Nozzle |
| NPS | Nominal Pipe Size |
| NPT | National (Taper) Pipe Thread |
| NRS | Non-Rising Stern |
| NTS | Not to Scale |
| OD | Outside Diameter |
| ORIF | Orifice |
| OS&Y | Outside Screw & Yoke |
| OSBL | Outside Battery Limits |
| OVHD | Overhead |
| P&ID | Piping and Instrumentation Diagram |
| P-T | Pressure Temperature |
| PARA | Paragraph |
| PAW | Plasma Arc Welding |
| PBE | Plain Both Ends |
| PE | Polyethylene; Plain End |
| PFA | Perfluoro (Alkoxyalkane) Copolymer |
| PFD | Process Flow Diagram |
| PIG | Pipeline Inspection Gauge |
| PIV | Post Indicator Valve |
| PL | Plate |
| PPL | Pipeline |
| PLE | Plain Large End |
| PLR | Pig Launcher and Receiver |
| PLS | Pipeline Specification |
| PMI | Positive Material Identification |
| PMS | Piping Material Specification |
| PO | Pushed On |
| POE | Plain One End |
| POS | Point of Support |
| PP | Polypropylene |
| PPB | Parts per Billion |
| PPM | Parts per Million |
| PQR | Procedure Qualification Record |
| PRESS | Pressure |
| PS | Pipe Support |
| PSE | Plain Small End |
| PSI | Pounds per Square Inch |
| PSIA | Pounds per Square Inch Absolute |
| PSIG | Pounds per Square Inch Gauge |
| PSL | Product Specification Level |
| PT | Liquid Penetrant Testing (Exam) |
| PTFE | Polytetrafluoroethylene |
| PVC | Polyvinyl Chloride |
| PVDC | Polyvinylidene Chloride |
| PVDF | Polyvinylidene Fluoride |
| PWHT | Postweld Heat Treatment |
| QCP | Quality Control Procedure |
| RA | Roughness Average (Replaced AARH) |
| RAD | Radius |
| RAT | Rating |
| RCV | Remote Control Valve |
| RED | Reducer; Reducing |
| REF | Reference |
| REINF | Reinforced |
| REPAD | Reinforcing Pad |
| REQD | Required |
| REV | Revision |
| RF | Raised Face |
| RJ | Ring Joint |
| ROE | Radius of Exposure |
| RP | Reduced Port |
| RPO | Restrained Push On |
| RS | Rising Stem |
| RT | Radiographic Testing (Exam) |
| RTFE | Reinforced TFE |
| RTP | Reinforced Thermosetting Plastic |
| RTR | Reinforced Thermoset Resin |
| SAW | Submerged Arc Welding |
| SAWH | Submerged Arc Helical Welding |
| SAWL | Submerged Arc Longitudinal Welding |
| SB | Small Bore |
| SCADA | Supervisory Control and Data Acquisition System |
| SCC | Stress Corrosion Cracking |
| SCCDIA | Stress Corrosion Cracking Direct |
| SCH | Schedule |
| SD | Shutdown |
| SDR | Standard Dimensional Ratio |
| SG | Specific Gravity |
| SI | Silicon |
| SMAW | Shielded Metal Arc Welding |
| SMLS | Seamless |
| SMYS | Specified Minimum Yield Strength |
| SO | Slip On |
| SOL | Sockolet |
| SP-WD | Spiral Wound |
| SPA | Spacer |
| SPEC | Specification |
| SQ | Square |
| SR | Short Radius |
| SS | Stainless Steel |
| SSC | Sulfide Stress Cracking |
| ST | Seat |
| STD | Standard |
| STL | Steel |
| STM | Steam |
| SVC | Service |
| SW | Socket Weld (preferred) |
| SWG | Swage |
| T&C | Threaded and Coupled |
| T&G | Tongue and Groove |
| T-T | Tangent-to-Tangent |
| T/SW | Threaded by Socketweld |
| TAN | Tangent |
| TBE | Thread Both Ends |
| TDH | Total Differential Head |
| TEMP | Temperature |
| TFE | Tetrafluoroethylene |
| TFL | Through Flowline |
| THK | Thick |
| THRD | Thread; Threaded |
| TI | Titanium |
| TL | Tangent Line |
| TLE | Thread Large End |
| TOC | Top of Concrete |
| TOE | Thread One End |
| TOG | Top of Grout |
| TOL | Thredolet |
| TOP | Top of Pipe |
| TOS | Top of Steel; Top of Support |
| TP | Test Pressure |
| TSE | Thread Small End |
| TW | Thermowell |
| TYP | Typical |
| UB | Union Bonnet |
| UG | Underground |
| UNC | Unified National Coarse Thread |
| UNF | Unified National Fine Thread |
| UNS | Unified Numbering System |
| UT | Ultrasonic Testing (Exam) |
| V | Vertical |
| VAC | Vacuum |
| V/D | Vents and Drains |
| VT | Visual Testing (Exam) |
| W/ | With |
| W/O | Without |
| WB | Welded Bonnet |
| WE | Weld End |
| WN | Weld Neck |
| WOG | Water, Oil, & Gas |
| WOL | Weldolet |
| WP | Working Point |
| WPQ | Weld Procedure Qualification |
| WPS | Weld Procedure Specification |
| WT | Wall Thickness |
| WWP | Working Water Pressure |
| XS | Extra Strong |
| XXS | Double Extra Strong |
| Y/T | Yield to Tensile Ratio |