Still about the flange issue
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In Section 9 of GB150-98, flanges are classified into 9.5 narrow-face flanges, 9.6 external-pressure flanges, and 9.7 wide-face flanges. What is the relationship between these types of flanges? Are they listed side by side? The 9.6 external pressure flange specifies that such flanges can be calculated as internal pressure flanges, but the bolt area only needs to be considered in its tightened state. Here, I would like to use an external pressure wide-face flange. How should I do that? I’m a bit dizzy
It’s the same principle. A wide-flange flange is simply one with bolt holes in the gasket. The external pressure also takes into account only the pre-tensioned state.
Reply to 2# Wen Bing: If bolt holes are drilled in the gasket, then wouldn’t there also be bolt holes on the sealing surface? I really didn’t pay attention to that
Reply to 3# — Lantian — Actually, if you take a look at the standard drawings for atmospheric manholes, you’ll see that this one uses a wide-flange type.