For transport tanks with a pressure of 1.8 MPa, the use of metal wound gaskets at the pressure testing manholes leads to leaks
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For transport tanks with a pressure of 1.8 MPa, the use of metal wound gaskets at the pressure testing manholes can cause leaks; however, the use of PTFE-metal wound gaskets (filled with PTFE tape) prevents leaks. The installation method is the same. The factory still prefers to use metal wound gaskets; how can the leakage problem be solved? Why is this the case? Please, experts, explain it to me
1. The sealing surface is uneven or defective. 2. The metal wound gasket is of poor quality; the graphite portion protrudes too much above the metal part: insufficient.
As a supplementary note, when installing it, should butter be applied to the gasket to prevent leaks?
As a supplementary note, when installing it, should butter be applied to the gasket to prevent leaks?
No oily substances should be applied
Metal wound gaskets should be the most flexible type of gasket; it’s incomprehensible if such gaskets still allow leaks to occur. The key to using this gasket lies in the method of tightening the bolts. To ensure even gaps around the flange, tighten it diagonally in stages; do not tighten it too much all at once or to completion in one go. It’s common sense. Yet this is also a skill that maintenance workers can be proud of. Especially for large-diameter flanges, it is likely due to human factors; for reference only.
Gaskets, flanges, and fasteners must be matched!
It’s likely that the gasket is not suitable; attention also needs to be paid to the way of tightening