There are problems with the metal wound gasket
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This post was last edited by Desert Fish on 2015-8-26 08:03. Problems occurred with the metal wound gasket during pressure testing; it was made of material B0222 and designed to handle a pressure of 100 kilograms. It started to disintegrate at a pressure of 60 kilograms. What usually causes this? I would be extremely grateful if the teachers could help analyze this Additional question: The gasket is DN50 PN100, made of material B0222, and complies with the standard HG20610-2009. According to this standard, the thickness of the wrapped part of the gasket should be 3.2, but we provide one with a thickness of 4.5. Logically, this thicker thickness should be better; it should hold up under a pressure of 30 kilograms, but when the pressure reaches 60 kilograms, there’s a loud noise and the gasket starts to leak.
It doesn’t seem to be much related to pressure; it might be a quality issue.
The bolt pre-tightening force may be too high, or the force applied during bolt tightening may be uneven; additionally, there could be issues with the quality of the gasket products.
There may be issues with the quality of the wrapping pad
The gasket structure wasn’t specified; there are many types of gaskets. There will be problems with manufacturing quality, installation quality, and dimensional fit
The gasket is DN50 PN100, made of material B0222, and complies with the standard HG20610-2009. According to this standard, the thickness of the wrapped part of the gasket should be 3.2, but we provide one with a thickness of 4.5. In theory, this thicker thickness should be better; it should hold up under a pressure of 30 kilograms, but when the pressure reaches 60 kilograms, there’s a loud noise and the gasket starts to leak.
0222 has no outer ring. The metal wound gasket itself can handle a pressure of 100 bar without any problem. I don’t know what the caliber is? Large-diameter winding gaskets tend to fall apart easily, and there may also be issues with product quality and installation.
B0222, DN50 PN100, standard HG20610-2009
Since the diameter isn’t large, it’s better to consider factors such as product quality, installation quality, and dimensional tolerances, as mentioned by everyone above.
This reason might be weak; the flange sealing surface is uneven, I guess... Just asking! The standard thickness is 3.2 mm; why is it being increased to 4.5 mm? It’s not necessarily true that a thicker layer leads to better sealing performance; the standard thickness is the result of comprehensive considerations. Could changes in the preload resulting from an increased thickness also affect the performance? For example, the preload is not appropriate, the gasket is too thick and not compressed, and there is no outer ring to begin with; as a result, the pressure increases...
It seems that the recommendations for various types of gaskets were removed in the 2009 version; in the 97 version, it was explicitly required to use type D gaskets.