Question: Pressure vessel sight glass

2020-06-13View Original

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Both NB/T47017-2011 and HG/T21619-1986 refer to pressure vessel sight glasses. NB/T47017 incorporates the contents of HGJ501–502, while HG/T21619 is essentially HGJ501–502 with a different name; however, NB/T47017 does not state that it replaces HG/T21619. Can both standards be used?

Reply #22020-06-13

One is a relatively new standard from the Ministry of Energy, while the other is an older standard from the Ministry of Chemical Industry that has not been repealed; the reference documents for the new standard 47017 state that GB150 is applicable to 47017.

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Question: Pressure vessel sight glass

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