The adequate tightness of flanged joints contributes to maintaining safe working conditions in numerous equipment and industrial installations. The new sealing technologies and materials can require more careful selection, handling and installation than previous asbestos equivalents. Many research studies have been conducted to understand and improve the assembly bolt load of piping joints in order to minimize the likelihood of leakage. The selection of the bolt load must consider many factors, such as: minimum gasket stress to achieve a seal; the maximum stress that will damage the joint components and the amount of gasket stress lost to creep-relaxation under room temperature and service condition. It is well known that the bolt load decrease to some degree after the initial assembly due to creep-relaxation characteristics of the gasket. ASME PCC-1 recommends restoring the gasket load, after a minimum 4 hours, due to short-term creep-relation. This paper intends to investigate factors which may influence the creep-relaxation characteristic of the compressed non-asbestos gasket. In order to reproduce real field condition, ASME B16.5 class 300lbs flanges were used in this experimental investigation.
- Pressure Vessels and Piping Division
An Experimental Investigation of the Factors That Contribute to the Creep-Relaxation of Compressed Non-Asbestos Gaskets
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Veiga, JCC, Cipolatti, CFA, de Sousa, AMF, & Reeves, DW. "An Experimental Investigation of the Factors That Contribute to the Creep-Relaxation of Compressed Non-Asbestos Gaskets." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 2: Computer Applications/Technology and Bolted Joints. San Antonio, Texas, USA. July 22–26, 2007. pp. 269-281. ASME. https://doi.org/10.1115/PVP2007-26645
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