What's the difference between ANSI B16.5 flange & ASME B16.5 flange?

What's the difference between ANSI B16.5 flange & ASME B16.5 flange? The answer is there is no difference.  First of all,  ANSI B16.5 standard was published  in 1973.  In 1996 the standard changed to ASME B16.5.   For 10 years prior to the change, the standard included both and was listed as ANSI/ASME B16.5.  The current and correct standard is ASME B16.5.  ANSI B16.5 is common industry lingo and is still referred to extensively by architects, engineers, manufacturers and suppliers.  And although the ANSI B16.5 standard does not technically exist, it its understood as another way to say ASME B16.5.  

The ASME B16.5 Standard defines the following details:

1.Dimensions

2.Tolerances

3.Materials

4.Markings

5.Pressure/Temperature Ratings

6.Pressure Testing

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