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Study on the Standard of Tightening Procedure of Pipe Flange Connections and Evaluation of its Sealing Performance by Computational Mechanics

管法兰连接拧紧程序标准研究及其密封性能计算力学评价

基本信息

批准号：
14550125
负责人：
FUKUOKA Toshimichi
金额：
$ 2.56万
依托单位：
Kobe University (2004)神戸商船大学 (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

1.Optimal Tightening Procedure of Pipe Flange ConnectionsIntroducing "Elastic Interaction Coefficient Method" into 3-D FEA, two numerical methods have been proposed, which can estimate the scatter of bolt preloads when tightening the clamping bolts with an arbitrary sequence and provide an optimal tightening sequence that gives uniform bolt preloads in the final state.2.Mechanical Behaviors of Pipe Flange Connections using Soft GasketsBy incorporating the stress strain relationship of asbestos joint sheet gasket that were obtained experimentally into FE analysis, an optimal tightening sequence, mechanical behaviors under external loads and its sealing performance have been analyzed systematically.3.Elucidation of Mechanical Properties of the Disassembly Process of Pipe Flange ConnectionsVariations of bolt clamping forces and contact pressure distributions on the gasket interface have been systematically analyzed using FE approach developed above.4.Proposal of a Robust Tightening Proced … More ure of Pipe Flange ConnectionsTo suppress the scatter in final bolt clamping forces, an effective tightening sequence is to clamp the four bolts simultaneously, which are apart ninety degrees each other, and then tighten the other bolts simply in the clockwise pattern.5.Effects of Short Bolt Clamping Force on the Sealing Performance of Pipe Flange ConnectionsIt has been found that the missing of two bolts causes 1.6 times initial clamping force in the remaining bolts in the case of 20 inch flanges.6.Relationship between the scatter in bolt preloads and gasket contact stresses from the view point of sealing performanceThe scatter due to torque control method is found to be fairly smaller than that due to the elastic interaction of bolt deformations caused by the successive tightening operation.7.Evaluation Procedure of Leakage Performance based on Computational MechanicsIt has been shown that the leakage rate can be estimated by means of the maximum contact stress occurred along the outer diameter of gasket.A part of the achievements of this study has been published from High Pressure Institute of Japan (HPI) as "A Guideline for Pipe Flange Tightening. Z103TR-2004". Less

1.管法兰连接的最佳拧紧工艺将“弹性相关系数法”引入三维有限元分析中，提出了两种数值计算方法，该方法可以估算出紧固螺栓按任意顺序紧固时螺栓预紧力的分散程度，并提供一个最优紧固顺序，使紧固螺栓在最终状态下预紧力均匀。2.采用软垫片的管法兰连接的力学行为将实验得到石棉垫片应变关系转化为有限元分析，提出了最佳拧紧顺序，采用有限元分析方法，系统地分析了螺栓夹紧力的变化规律和垫片接触面上的接触压力分布4.稳健拧紧过程的建议 ...更多信息管法兰连接的紧固为了抑制最终螺栓夹紧力的分散，有效的紧固顺序是同时夹紧四个螺栓，这四个螺栓彼此分开九十度，5.短螺栓夹紧力对管法兰连接密封性能的影响研究发现，少用两个螺栓时，其夹紧力为初始夹紧力的1.6倍6.从密封性能的观点看螺栓预紧力的分散与垫片接触应力之间的关系发现由于扭矩控制方法引起的分散比由于连续拧紧操作引起的螺栓变形的弹性相互作用引起的分散小得多。7.基于计算力学的泄漏性能评估方法结果表明，泄漏率可以通过沿密封垫外径沿着方向的最大接触应力来估算，部分研究成果已由日本高压研究所（HPI）出版为“管道法兰紧固指南”。Z103TR-2004”。少