ANSI B16 or ASME B16 or both?

Many (pro?)fessionals, suppliers and manufacturers often talk about ANSI flanges, ANSI fittings etc. Just do a search on any Standards providers website for ANSI B16.5, ANSI B16.9, ANSI B16.10 etc.
You will not find that standards, because they do not exist.

Many years ago there was, as an example, a ANSI B16.5 standard. In 1988 it became ANSI/ASME B16.5 and in 1996 it became ASME B16.5. However, there are still many suppliers and manufacturers that refer to ANSI or ANSI/ASME and that's nots correct. There are also other standards which have changed to ASME and are still being miss-quoted in documents. Below you will find some examples, of the history, of particular ASME standards.


ASME B16.5
Pipe flanges and flanged Fittings NPS 1/2 through NPS 24 Metric/Inch
ASME B16.9
Factory-Made Wrought Buttwelding Fittings
ASME B16.10
Face-to-Face and End-to-End Dimensions of Valves
ASME B16.11
Forged Fittings, Socket Welding and Threaded
ASME B16.20
Metallic Gaskets for Pipe Flanges, Ring-Joint, Spiral-Wound, and Jacketed
ASME B16.25
Buttwelding Ends
ASME B16.34
Valves - Flanged, Threaded and Welding End
ASME B16.36
Orifice Flanges
ASME B16.47
Large Diameter Steel flanges NPS 26 through NPS 60 Metric/Inch standard
ASME B16.48
Line Blanks

If you've read any of the articles above you will understand that ANSI and ASME work together, but that many standards have been adopted by ASME and are appointed since a long time, as ASME standard.


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