On the Effect of Temperature on Tightening Characteristics of Gaskets

Abstract

To study the effect of temperature on the tightening characteristics of gaskets, leak rate tests were performed using a servo-hydraulic test equipment (short term temperature exposure). According to the tests the tightening behaviour of gaskets made of fibre based sheet material improved with temperature due to additional deformation of the gaskets during the test. In tests with camprofile gaskets with graphite layers there was no significant additional deformation of the gasket thus the leak rates showed no difference between room temperature and elevated temperature. Regarding long term exposure to temperature it is expected that with a lot of gasket materials the leak rates increase after a certain aging period. It is too expensive to study these effects with complex servo-hydraulic test rigs. Therefore a more simple test rig was developed that can be loaded in hydraulic test rigs (to determine leak rate vs. gasket stress curves) and that can be exposed to temperature in an oven or by a special heating device.

Leak rate investigation of expanded polytetrafluoroethylene flat gasket

“…To measure the leakage rate, test equipment "TEMES fl.ai1" fig. 2 was used with software controlling the effective gasket surface stress, supplying test gas under pressure and reading the mass of gas passed through the gasket [10,11,12]. Helium was used as the test gas in the test.…”

Study on the gasket parameters and the calculation of MMC flange joint according to XP CEN\TS 1591-3

“…Stress-strain curves and its linearization at 20 C. influencing the gasket relaxation are temperature and time. [13][14][15][16] Here, the stress relaxation tests at different temperatures are conducted to study the effect of MMC graphite gasket's stress relaxation on the sealing behavior. The MMC graphite gaskets are loaded to the target stress value (between 40 MPa and 50 MPa).…”