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Pressure vessel sight glass

2025-03-17View Original

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Has HG/T21620-1986 been repealed?
Reply #22025-03-17
Yes, HG/T21620-1986 has been revoked. .
Reply #32025-03-18
NBT47017-2011 Viewports for pressure vessels – the dimensions are the same
Reply #42025-03-18
I checked on the Work Standard Network and it hasn’t been repealed. It meets the current standards.

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