High-hazard medium manhole flange type
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Must the manhole flange type for highly hazardous media be a necked butt-welded flange?
Yes, for manhole flanges used with highly hazardous media, wafer-type flanges are usually required to ensure higher sealing performance and safety. .
The sealing surface should preferably be an MFM sealing surface, not an RF sealing surface
Welded flanges with necks must be used. Equipped with winding gaskets and high-strength fasteners; no specification for the type of sealing surface
There are indeed many different types of flanges, ah, haha
4.2.4 For containers holding extremely and highly toxic hazardous media, moderately toxic hazardous media with high permeability, and liquefied petroleum gas, necked butt-weld flanges shall be used for their connection flanges.