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Does joint surface roughness affect flange tightness

2019-07-05 16:57:37

We all know that flange connection is the possibility of leakage, there are many reasons, but the direct reason or avoidable factor is the roughness of the connection surface, if you can well control the surface roughness of the connection parts, I believe it is possible to reduce the possibility of flange leakage. Here to share the impact of the lower surface roughness on flange sealing.

It is certain that the flange surface roughness has a great impact on the sealing effect, especially when using non-soft gasket, the sealing surface roughness is one of the main causes of leakage. For example, cutting flange face is spiral line, when using the metal gasket, if the roughness value is large, the gasket can not block up the spiral groove formed by the knife line, under the pressure, the medium will leak out along the groove. Soft sealing gasket on the flange surface of much lower level of cleanliness requirements. This is because it is easy to deformation, can block processing knife lines, thus preventing leakage. For soft gaskets, stainless steel flange and too smooth but unfavorable, because at this time the interface leakage resistance decreases. Therefore, for those connection surface roughness is too large, we can use gasket in flange connection, but also requires the gasket surface as smooth as possible.