抄録
The use of asbestos gaskets in pipe-flanges has already been prohibited in Japan. Nowadays, non-asbestos gaskets, of which materials are PTFE, expanded graphite, etc. , are used in industries. Gasket users expect the non-asbestos gaskets to have better performance than that of asbestos gasket. So far, non-asbestos gaskets have not gained high reliability as gasket users do not have long term data in terms of the life of gaskets.
In this paper, the thermal endurance life of non-asbestos gaskets and asbestos gaskets were tested. The gaskets were held at several constant temperatures, such as 200°C, 214°C, 260°C, 280°C and 300°C, and the weight loss, the change of axial bolt force and sealability are measured using a test rig. The thermal endurance life is estimated using the Arrhenius equation and discussions are made on the non-asbestos-gasket life.
