• India                     BIS : Bureau of Indian standards.
  • S.A                   ASME : American Society of Mechanical Engineers
  • United Kingdom   BSI : British Standards Institute
  • Germany               DIN :      Deutsches Institute for Normung.
  • Japan                    JIS : Japanese Industrial Standards
  • Europe                  CEN : Europe Community for Standardisation
  • Canada                CSA : Canadian Standards Association
  • France                 AFNOR : Association Francoise

Commonly used American Standards in Piping

  • The American Petroleum Institute (API).
  • The American Iron and Steel Institute (AISI).
  • The American National Standards Institute (ANSI).
  • The American Society for Testing and Materials (ASTM).
  • The American Welding Society (AWS).
  • The American Water Works Association (AWWA).
  • The Manufactures Standardisation Society & Industry-Standards practices (MSS-SP)
  • The American Society of Mechanical Engineers (ASME).

ASME Piping codes

ASME B 31.1 Power piping

ASME B 31.3 Process Piping for Petroleum refineries, Chemical,

Pharmaceutical, Textile, Paper, Semiconductor & Cryogenic plant

ASME B 31. 4 Piping generally used for transporting & distributing liquid

Hydrocarbons & other liquids

ASME B 31.5 Refrigeration piping

ASME B 31.8 Piping generally used for transporting & distributing Gases.

ASME B 31.9 Building services

ASME B 31.11 Slurry transportation piping system


ASME Fitting standards

ASME B 16.5 Pipe Flanges and Flanged Fittings NPS ½ Trough NPS 24

ASME B 16.9 Factory-Made Wrought Steel Buttwelding Fittings

ASME B 16.10 Face-to-Face and End-to-End Dimensions of Valves

ASME B 16.11 Forged Fittings, Socket- Welding and Threaded

ANSI B 16.14 Ferrous Pipe Plugs, Bushing and Locknuts with Pipe Threads

ASME B 16.20 Metallic Gaskets for Pipe Flanges- Ring-Joint, Spiral-Wound, and


ASME B 16.21 Nonmetallic Flat Gaskets for Pipe Flanges

ASME B 16.25 Buttwelding Ends

ASME B 16.28 Wrought Steel Buttwelding Short Radius Elbows

ASME B 16.34 Valves – Flanged, Threaded, and Weldin g End

ASME B 16.36 Orifice Flanges

ASME B 16.47a Large Diameter Steel Flanges NPS 26 Through NPS 60

ANSI B 18.2.1 Square and Hex Bolts and Screws (Inch Series)

ANSI B 18.2.2 Square and Hex nuts (Inch Series)

ASME B 36.10M Welded and Seamless Wrought Steel Pipe

ASME B 36.19M Stainless Steel Pipe