scope:

Gasket performance data and technical formulations which would permit the design of gasket systems for high temperature service were studied to better understand flange behavior, gasket deformation, and leakage behavior under simulated elevated temperature service conditions. This WRC Bulletin discusses the results obtained for the four areas covered in the study: the extrapolated long-term elevated temperature performance of compressed asbestos-reinforced sheet materials the effect of the creep/relaxation of flexible graphite sheet materials at elevated temperatures on the tightness of a joint in which the gasket deflection remains practically constant the effect of the gas medium and pressure on the tightness performance at elevated temperature of graphite-filled spiral-wound gaskets with and without internal rings the correlations between the weight loss of elastomeric sheet gasket materials during aging at elevated temperatures and the changes in their mechanical properties and tightness performance - leading to the proposal of a new aging parameter, based on weight loss correlation and successfully grouping the data obtained for different test times and temperatures Publication of this document - WRC Bulletin No. 391 was sponsored by the Pressure Vessel Research Council