2013 Fiscal Year Final Research Report
Characteristics of non-asbestos gaskets at elevated temperatures and the estimation of the life of flange connections
| Project/Area Number |
23560173
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Numazu National College of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
TSUJI Hirokazu 東京電機大学, 工学部, 教授 (10163841)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 機械要素 / ガスケット / フランジ締結体 / 高温 / 変形特性 / ボルト軸力 / 密封特性 / 寿命 |
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| Research Abstract |
After the prohibition of the use of asbestos materials, PTFE-based gaskets are often employed in bolted flanged connections. The behavior of bolt force changes under thermal loading was experimentally examined. It is found that the bolt forces reduce at the first thermal loading due to the gasket flow. Once the gasket is settled, the bolt force changes depend on the difference of the thermal coefficients of flanges, bolts and gaskets.
An analytical model of a bolted flanged connection, in which the flanges, the bolts and the gasket are represented by spring constants, is proposed. The residual bolt forces can be estimated based on the analytical model of the bolted flanged connection and the deformation characteristic of the gasket. The results can be applied to ensure the integrity of flanged connections.
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