1.1 This method determines the long term (aged) relaxation, leakage, weight loss and adhesion performance of gasket materials for pressurised bolted flanged connections. A mechanical integrity check of the material is also done. The method It applies mainly to circular gasket products typically used in process or power plant pressure vessels and piping. In this method, one annular gasket sample is loaded in an ARLA fixture. The loaded fixture is then put into an oven at the specified temperature. The measured properties in the test method are load relaxation, gasket thickness loss, weight loss, leak rate and gasket adhesion to flange surfaces. All properties are measured at room temperature and, except for gasket adhesion, the measurements do not require dismantling the fixture. Progressive gasket deterioration data can be obtained by interrupting the exposure, allowing the fixture to cool-down to room temperature, taking the measurements, and heating the fixture again to continue the aging process. Thermal exposure is usually performed in an air oven, although aging in other atmospheres (e.g. N2, Steam) is also possible in special sealed chambers. Temperature is limited to 750F (400C). 1.2 This standard may involve hazardous materials, operation and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.3 The values stated in SI units are to be regarded as the standard.
KeywordsARLA, gasket aging, leakage ring gaskets
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development