The design standard for equipment manholes is HG/T21521. How should the gasket type for such manholes be selected?
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Hello, dear colleagues. We have a storage tank with a constant-pressure conical roof, and the design standard for its manholes is HG/T21521. Now, during maintenance, it is necessary to replace the manhole gaskets, but we’re not sure which ones to choose. We hope experts can offer some guidance!
It depends on what gasket you were using before; generally, it’s a Type D wound gasket in accordance with the HG/T20610 standard.
It is best to be the same as the original gasket. The material and type of gasket are related to the properties of the medium inside the equipment, and the selection principles are the same as those for pipe flange gaskets
It’s best to check the standards; generally, the standards include information regarding gaskets
Make the selection in accordance with the standards, based on requirements such as the pressure class of the flange and the type of medium.