Flange EN1092-1 Type 21 Bore Diameter
Engineering Asked on December 23, 2020
How is the bore diameter of a flange Type 21 – acc. EN 1092-1 determinated?
In the standard:
NOTE 5 The bore diameters of flanges type 21 are not specified in this standard, the effective bore diameters are usually
given in the relevant component standard(s).
What are the relevant component standard(s)?
One Answer
Type 21 flanges are "integral flanges" and in my experience these are completely manufacturer dependent. This grouping would include long weld neck (LWN), heavy barrel (HB), equal barrel (EB), or any other custom offering. I've experienced where two NPS 2" long weld neck flanges on the same pressure vessel built around 1994 had different thicknesses because they were procured from two different suppliers. I think this is less common now as manufacturers have consolidated.
I believe this is why the EN1092-1 refers to component standards, which I read to mean manufacturer's standard.
Answered by mechengjoe on December 23, 2020
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