Here is the compiled list of Piping Abbreviations. This is not an exhaustive list and is updated regularly.
- ASME: American Society of Mechanical Engineers
- ASTM: American Society for Testing and Materials
- AWS: American Welding Society
- AWWA: American Water Works Association
- BBE: Beveled Both Ends
- BBP: Bottom of Base Plate
- BLE: Beveled Large End
- BOM: Bill of Material
- BOP: Bottom Of Pipe
- BSE: Beveled Small End
- BW: Butt Weld
- CI: Cast Iron (Material)
- CONC: Concentric (Reducer)
- CS: Carbon Steel (Material)
- DRL: Double Random Length (Pipe Length)
- ECC: Eccentric (Reducer)
- FC: Fail Close (Valve)
- FF: Flat Face (Flange)
- FO: Fail Open (Valve)
- FOB: Flat On Bottom (Eccentric Reducer)
- FOT: Flat On Top (Eccentric Reducer)
- FPT: Female Pipe Thread
- FRP: Fiber Reinforced Pipe
- LR: Long Radius (Elbow)
- MTO: Material Take Off
- NC: Normally Closed (Valve)
- NO: Normally Open (Valve)
- PE: Plain End
- POExTOE: Plain One End Threaded Other End (Pipe Nipple)
- RF: Raised Face (Flange)
- RTJ: Ring Type Joint (Flange)
- Sch: Schedule (Thickness of Pipe)
- SMLS: Seamless
- SO: Slip On (Flange)
- SPWD: Spiral Wound (Gasket)
- SR: Short Radius (Elbow)
- SRL: Single Random Length (Pipe Length)
- SS: Stainless Steel (Material)
- STD: Standard Weight (Thickness of Pipe)
- WN: Weld Neck (Flange)
- WRC: Welding Research Council