Seeking the old standard for gasket specifications
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I’m seeking help from everyone: We have some old equipment, and back then the gasket specifications for manhole covers followed the HGJ 69-74 (1991) standard. Now we need to know the dimensions of these gaskets, but this standard is no longer available online; only HG 20592-20635 can be found. I’m not sure if the dimensions are the same. If anyone has the HGJ 69-74 (1991) standard, please send it to me. Thank you! ! !
If the standard is too old, it’s better to look for old books; electronic versions are unlikely to exist. If it’s a pipe flange gasket, the dimensions should not differ much from those of the current version
Replaced by HG 20592-20635-97
You can measure the specific values and compare them with the current standards for pipe flanges, gaskets, and fasteners. There are basically no electronic versions for the \"too old\" criterion. Also, is the equipment’s service life that long?
“For \"old books\", what kind of books should one look for?