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Can the DN designation be used to indicate dimensions in the ASME B16.5 flange standard?

2023-05-11View Original

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Can the DN designation be used to indicate dimensions in the ASME B16.5 flange standard? Or can it only be expressed using NPS? In China, does HG/T 20615 allow the use of both DN and NPS for representation?
Reply #22023-05-11
The ASME B16.5 flange standard allows dimensions to be expressed only in NPS, not in DN. In China, in accordance with the HG/T 20615 standard, dimensions can be expressed either in DN or NPS. .
Reply #32023-05-11
ANSI B16.5 specifies requirements and provides examples for the identification of flanges, using NPS 1\", 2, 3, ……; the standard can be downloaded for further reading. In China, standards such as GB9115, HG/T20592, and SH3406 generally use DN15, 20, 25, 40.....
Reply #42023-05-12
Agree with the view from the 2nd floor; ASME B16.5 uses only NPS to denote it, not DN.

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Translated at 2026-07-26 12:22:37

Original: https://bbs.hcbbs.com/thread-3607042-1-1.html

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