09
2022
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09
Briefly explain the sealing principle of flat welding flanges
Author：
The sealing principle of the flat welding flange: the two sealing surfaces of the bolt press the flange gasket against each other and form a seal, but this also leads to the destruction of the seal.
In order to maintain the seal, the flat welding flange has to maintain a huge bolt force. For this reason, the bolt must be made larger.
And larger bolts match larger nuts, which means that larger diameter bolts are needed to create conditions for tightening the nuts.
However, the larger the diameter of the flat welding flange bolt, the applicable flange will become bent, and the only way is to increase the wall thickness of the flange part.
The entire installation will require enormous size and weight, which is a particular problem in the offshore environment, where weight is always the main concern one has to take.
And, fundamentally, a flat weld flange is an ineffective seal, requiring 50% of the bolt load to squeeze the gasket, and only 50% to hold the pressure.
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