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PRCI PR-15-9107
- Development/Testing of Asbestos-Free Gasket Materials
- Report / Survey by Pipeline Research Council International, 01/01/1992
- Publisher: PRCI
$198.00$395.00
L51662e
Southwest Research Institute
Need: The motivation of the Pipeline Research Committee of PRCI in pursuing this study was prompted by established and ensuing legislation, which has restricted the use of asbestos in domestic and most industrial products. It was deemed necessary to conduct an in depth exploration of alternative materials which could serve as a substitute forasbestos.
Benefit: A survey of the gasket and sealant industry identified 27 vendors who were contacted for literature and data. Of these, 11 were subsequently invited to supply detailed literature and samples for screening. These samples were subjected to thermal analysis for weight loss versus temperature followed by high-pressure, hydrostatic testing and fire testing.
Result: Virtually all the asbestos-free gaskets proved acceptable to temperatures up to 400°C in an air-free environment, and most of these exhibited good stability to 700°C. Several have been identified which can be used to temperatures over 900°C in air or gases, since they are essentially of ceramic composition. There are several graphitic gaskets which are serviceable to 900°C in the absence of air or in a nonoxidizing atmosphere. Several of the most promising materials were subsequently steam pressure tested to 315°C and performed quite well requiring a single adjustment in bolt/flange pressure after pres-surization. Many of the gaskets acquired a compression set that results in a slight pressure loss, but responded well to bolt tightening, which did not require more than the one adjustment after pressurization (ambient, water, or steam).
Southwest Research Institute
Need: The motivation of the Pipeline Research Committee of PRCI in pursuing this study was prompted by established and ensuing legislation, which has restricted the use of asbestos in domestic and most industrial products. It was deemed necessary to conduct an in depth exploration of alternative materials which could serve as a substitute forasbestos.
Benefit: A survey of the gasket and sealant industry identified 27 vendors who were contacted for literature and data. Of these, 11 were subsequently invited to supply detailed literature and samples for screening. These samples were subjected to thermal analysis for weight loss versus temperature followed by high-pressure, hydrostatic testing and fire testing.
Result: Virtually all the asbestos-free gaskets proved acceptable to temperatures up to 400°C in an air-free environment, and most of these exhibited good stability to 700°C. Several have been identified which can be used to temperatures over 900°C in air or gases, since they are essentially of ceramic composition. There are several graphitic gaskets which are serviceable to 900°C in the absence of air or in a nonoxidizing atmosphere. Several of the most promising materials were subsequently steam pressure tested to 315°C and performed quite well requiring a single adjustment in bolt/flange pressure after pres-surization. Many of the gaskets acquired a compression set that results in a slight pressure loss, but responded well to bolt tightening, which did not require more than the one adjustment after pressurization (ambient, water, or steam).
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