Standardisation of Pipe Joints

The following American Standards are used for the standardisation of pipe joints


1. ANSI BI.1 Unified Inch Screw Threads (UN and UNR Thread Form)

2. ANSI BI.20.1 Pipe Threads, General Purpose (Inch)

3. ANSI B16.5 Pipe Flanges and Flanged Fittings

4. ANSI B16.9 Factory made Wrought Steel Butt Welding Fittings

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

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

7. ANSI B16.21 Non-Metallic Flat Gaskets for Pipe Flanges

8. API 601 Metallic Gaskets for RF Pipe Flanges and Flanged Connections

9 .API 6A Specification for Wellhead and Christmas Tree Equipment

10. ANSI B16.47 Large Diameter Steel Flanges (NPS26 through NPS60)

11. API 605 Large Diameter Carbon Steel Flanges

12. ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings

13. BS 1560 Steel Pipe Flanges and Flanged Fittings

14. BS 3381 Metallic Spiral Wound Gaskets for Use with Flanges to BS 1560

15. BS 1832 Oil Resistant Compressed Asbestos Fibre Jointing

16. BS F125 Rubber Bonded Compressed Asbestos Fibre Jointing

17. BS 3293 Carbon Steel Pipe Flanges (over 24” NB) for the Petroleum Industry

18. BS 3799 Steel Pipe Fittings, Screwed and Socket-Welded for the Petroleum Industry

19. BS 1580 Specification for Unified Screw Threads