Combined loading performance analysis of gasketed bolted flange joints with emphasis on bolt scattering

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-09-27 DOI:10.15282/jmes.17.3.2023.3.0757

None Kamran Khan, Israr Ahmed

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引用次数: 0

Abstract

Gasketed bolted flange joints (GBFJ) are commonly used in various industries however, their failure could result in significant losses not only in terms of financial but human life as well. Most of the work present on the performance of the GBFJ involves simplified assumptions by neglecting the effect of bolt scatter. Also, there is a paucity of studies investigating the sealing performance of GBFJ under combined thermal transient and structural loading. In the present study, two different flange sizes of ANSI B16.5 pressure class 900 (4in. and 6in.) are evaluated, using a detailed three-dimensional finite element analysis (FEA). ASME bolt tightening scheme was applied for the preloading of the bolts. Higher bolts and gasket stresses were observed in the case of 6in. flange joint. Also, greater variation in bolt stresses (up to 18 % of the target value) was observed for the 6 in. model which may be due to higher number of bolts resulting in greater scattering phenomena. Both models were found to be safe under the structural loading. However, large relaxation in stresses was observed at high bulk temperature. The gasket stress in 4in. flange model was observed to be less than the minimum seating stress (69 MPa) at temperatures greater than 300 °C implying possible leakage. However, stresses in the 6in. model stayed within the safe limit throughout the thermal and structural loading due to higher bolt target stresses, resulting in its proper seating even at higher temperatures.

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以螺栓散射为重点的垫圈螺栓法兰连接组合加载性能分析

垫圈螺栓法兰接头(GBFJ)广泛应用于各种工业中，但其失效不仅会造成经济损失，而且会造成人员伤亡。大多数关于GBFJ性能的研究都涉及简化假设，忽略了螺栓散射的影响。此外，关于GBFJ在热瞬态和结构复合载荷下的密封性能的研究也很少。在本研究中，ANSI B16.5压力等级900 (4in)的两种不同法兰通径。使用详细的三维有限元分析(FEA)评估和6英寸。螺栓的预紧采用ASME螺栓紧固方案。在6in的情况下，观察到更高的螺栓和垫圈应力。法兰接头。此外，对于6英寸套管，螺栓应力变化更大(可达目标值的18%)。这可能是由于较高的螺栓数量导致更大的散射现象。两种模型在结构荷载作用下都是安全的。然而，在较高的体温下，应力有较大的松弛。衬垫应力在4英寸。在温度高于300°C时，法兰模型小于最小阀座应力(69 MPa)，这意味着可能存在泄漏。然而，在6英寸的应力。由于较高的螺栓目标应力，模型在整个热载荷和结构载荷过程中保持在安全范围内，即使在较高温度下也能保持适当的阀座。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.