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English Translations » 【管道阀门技术圈】 » Why are the outer diameters of sh3405 and hg20553 still diff

Why are the outer diameters of sh3405 and hg20553 still different?

2017-10-12View Original

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Today, while checking these two standards, I noticed that there are differences in the outer diameter. Why is that? Please ask the experts for guidance
Reply #22017-10-17
hg20553 has three series: Ia, Ib, and II; only Ia and sh/t3405 are corresponding
Reply #32019-07-26
Not all of the specifications for DN65 and DN125 are different, although they belong to non-standard pipe diameters
Reply #42020-12-08
To this day, I still don’t understand why one nominal bore can correspond to two different outer diameters

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Translated at 2026-07-21 04:21:13

Original: https://bbs.hcbbs.com/thread-1851189-1-1.html

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