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American Petroleum Institute (API)


The American Petroleum Institute (API) publishes specifications (Spec.), bulletins (Bull.), recommended practices (RP), standards (Std.), and other publications (Publ.) as an aid to procurement of standardized equipment and materials. These publications are primarily intended for use by the petroleum industry. However, they can be and are used by others in that they are referenced in a code or invoked in the purchase order/specification governing the design and construction of piping systems. For example API Specification 5L and the API Standard 605 are referenced in ASME B31.1, Power Piping Code. The following documents, which relate to piping, are published by the API.

Specifications (Spec.)

  • Spec. 2B-96 --> Specification for the Fabrication of Structural Steel Pipe

  • Spec. 6D-94 --> Specification for Pipeline Valves (Gate, Plugs, Ball, and Check Valves)

  • Spec. 5L-95 --> Specification for Line Pipe

  • Spec. 5LC-91 --> Specification for CRA Line Pipe

  • Spec. 6FA-94 --> Specification for Fire Test for Valves

  • Spec. 6FC-94 --> Specification for Fire Test for Valves with Automatic Backseats

  • Spec. 15HR-95 --> Specification for High Pressure Fiberglass Line Pipe

  • Spec. 15LE-95 --> Specification for Polyethylene Line Pipe (PE)

  • Spec. 15LR-90 --> Specification for Low Pressure Fiberglass Line Pipe

  • Spec. 5B-88 --> Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads; Thirteenth Edition, Supplement 1, July 1990

  • Spec. 6FA-94 --> Specification for Fire Test for Valves

  • Spec. 6B-92 --> API specification for Fire Test for End connections

  • Spec. 6FC-94 --> Specification for Fire Test for Valves with Automatic Backseats

  • Spec. 6FD-95 --> Specification for Fire Test for Check Valves

  • Spec. 14A-94 --> Specification for Subsurface Safety Valve Equipment

  • Spec. 14D-94 --> Specification for Wellhead Surface Safety Valves and Underwater Safety Valves for Offshore Service

Bulletins (Bull.)

  • Bull. 5C3-94 --> Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties

  • Bull. 6AF-95 --> Bulletin on Capabilities of API Flanges Under Combinations of Load

  • Bull. 6F2-94 --> Bulletin on Fire Resistance Improvements for API Flanges

Recommended Practices (RP)

  • RP 5A3 --> Recommended Practice on Threaded Compounds for Casing, Tubing, and Line Pipe

  • RP 5A5-97 --> Recommended Practice for Field Inspection of New Casing, Tubing, and Plain-End Drill Pipe

  • RP 5B1-96 --> Recommended Practice for Gauging and Inspection of Casing, Tubing, and Line Pipe Threads

  • RP 5L1-96 --> Recommended Practice for Railroad Transportation of Line Pipe

  • RP 5L2-87 --> Recommended Practice for Internal Coating of Line Pipe for Noncorrosive Gas Transmission Service

  • RP 5L3-96 --> Recommended Practice for Conducting Drop-Weight Tear Tests on Line Pipe

  • RP 51-5-75 --> Recommended Practice for Marine Transportation of Line Pipe; First Edition

  • RP 5L6-79 --> Recommended Practice for Transportation of Line Pipe on Inland Water ways; First Edition

  • RP 5L7-88 --> Recommended Practices for Unprimed Internal Fusion Bonded Epoxy Coating of Line Pipe

  • RP 5L8-96 --> Recommended Practice for Field Inspection of New Line Pipe

  • RP 6G-82 --> Recommended Practice for Through Flowline (TFL) Pump Down Systems

  • Bull 6AF-95 --> Technical Report on Capabilities of API Flanges under Combinations of Load

  • Bull 6AF1-91 --> Bulletin on Temperature Derating of API Flanges Under Combinations of Loading

  • Bull 6RS-90 --> Standardization of Valves and Wellhead Equipment

  • RP 1OE-94 --> Recommended Practice for Application of Cement Lining to Steel Tubular Goods, Handling, Installation, and Joining; Third Edition ISO 10409

  • RP 11V7-90 --> Recommended Practice for Repair, Testing, and Setting Gas Lift Valves; First Edition

  • RP 15TL4-93 --> Recommended Practice for Care and Use Fiberglass Tubulars

  • RP 17B-88 --> Recommended Practice for Flexible Pipe

  • RP 520 PTI-93 --> Recommended Practice for Sizing, Selection, and Installation of Pressure Relieving Devices in Refineries, Part I—Sizing and Selection

  • RP 520 PT II 94 --> Recommended Practice Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries, Part II—Installation

  • RP 574-90 --> Inspection of Piping, Tubing, Valves, and Fittings; First Edition (Replaces Guide for Inspection of Refinery Equipment Chapter XI)

  • RP 1102-93 --> Recommended Practice for Liquid Petroleum Pipelines Crossing Railroads and Highways

  • RP 1107-91 --> Recommended Pipe Line Maintenance Welding Practices

  • RP 1109-93 --> Recommended Practice for Marking Liquid Petroleum Line Facilities

  • RP 1110-97 --> Recommended Practice for Pressure Testing of Liquid Petroleum Pipelines

Standards (Std.)

  • Std. 526-95 --> Flanged Steel Pressure-Relief Valves Seat

  • Std. 527-91 --> Seat Tightness of Pressure Relief Valves

  • Std. 594-91 --> Wafer and Wafer-Lug Check Valves

  • Std. 598-90 --> Valve Inspection and Testing

  • Std. 599-94 --> Metal Plug Valves—Flanged and Welding End

  • Std. 600-91 --> Steel Gate Valves—Flanged and Butt Welding Ends

  • Std. 602-93 --> Compact Steel Gate Valves—Flanged, Threaded, Welding, and Extended Body Ends

  • Std. 603-91 --> Class 150, Cast, Corrosion-Resistant, Flanged-End Gate Valves

  • Std. 607-93 --> Fire Test for Soft-Seated Quarter Turn Valves

  • Std. 608-95 --> Metal Ball Valves—Flanged, Threaded and Welding Ends

  • Std. 609-91 --> Lug and Wafer Type Butterfly Valves

  • Std. 1104-94 --> Welding of Pipelines and Related Facilities; Seventeenth Edition

Publications (Publ.)

  • Publ. 1113-93 --> Developing a Pipeline Supervisory Control Center

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