Find gasket standards using flange standards
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I’ve always been confused about how to find the gasket standards based on flange standards; I tried to do it by following what others said, but it’s still a bit unclear to me. I would like to ask how to find out the specific details. For example, for the flange standard HG/T 21521-2005 and a manhole flange with dimensions DN500-PN25-RF, what is the standard for the gaskets that should be used? If possible, a more detailed process would be helpful, so that similar problems do not arise in the future. Thank you.
If it’s a manhole standard, then just use the manhole standard – HG/T21514-2005
Find the gasket standard corresponding to the manhole specifications you mentioned, and then select the gasket of the appropriate specification from that standard. If the butt-welded pipe flange of DN80PN40 specified in HG20595-2009 is to be sealed using a PTFE-lined gasket, then HG20607-2009 can be referred to according to the aforementioned specifications