Applicable ANSI/API Standards

American Standards are used for the standardisation of pipe joints:

ASME B1.1 - Unified Inch Screw Threads (UN and UNR Thread Forms)

ANSI B1.20.1 - Pipe Threads, General Purpose (Inch)

ASME/ANSI B16.5 - Pipe Flanges and Flanged Fittings

ANSI B16.9 - Factory made Wrought Steel Butt Welded Fittings

ANSI B16.11 - Forged Steel Fittings, Socket Welding and Threaded

ANSI B16.20 - Ring-Joint Gaskets and Grooves for Steel Pipe Flanges

ASME B16.21 - Non-Metallic Flat Gaskets for Pipe Flanges

API 601 - Metallic Gaskets for RF Pipe Flanges and Flanged Connections

API 6A - Specification for Wellhead and Christmas tree Equipment

British Standards are also used for the standardisation of pipe joints.

BS 1560: (Sec 3) - Steel Pipe Flanges and Flanged Fittings.

BS 3381 - Metallic Spiral Wound Gaskets for use with Flanges to BS 1560.

BS 1832 - Oil Resistant Compressed Asbestos Fibre Jointing.

BS 3293 - Carbon steel pipe flanges (over 24” NPS) for the petroleum industry.

BS 1580 - Specification for Unified Screw Threads.