ANSI B16 or ASME B16 or both?

Many professional suppliers and manufacturers often talk about ANSI flanges, ANSI fittings, etc. Do a Google search for ANSI B16.5, ANSI B16.9, ANSI B16.10, etc.
In principle, you will not find those standards, because they no longer exist.

For example, many years ago there was an ANSI B16.5 standard. In 1988 the standard became ANSI/ASME B16.5 and in 1996 the standard became ASME B16.5. However, there are still many suppliers and manufacturers that refer to ANSI or ANSI/ASME.

The example B16.5 mentioned above deals with flanges, but there are other standards that have changed in ASME that are still misquoted in documents. Below are some examples from the history of certain 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.