An analysis of changes in flange surface roughness after being used to tighten a corrugated metal gasket

Abstract

A corrugated metal gasket is not reusable once the plastic deformation has occured. Meanwhile, flange might be reusable if it has not corroded. This research aimed to find out the surface roughness and contour shape of the flange after being used to tighten the gasket. This study employed a method of measuring the surface roughness before and after the first, second, third, and fourth tightening. The flange used had a surface roughness of Ra 3.5μm, Ra 2.5 μm and Ra 1.5 μm. The measurement of surface roughness was based on the standard of JISB0601-2001. The findings show that no significant change occured on the flange surface roughness. However, the corrugated contour shape did occur in the surface roughness after use.