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Research Papers: Design and Analysis

Elastic Interaction in Bolted Flange Joints: An Analytical Model to Predict and Optimize Bolt Load

[+] Author and Article Information
Linbo Zhu

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: linbozhu@mail.xjtu.edu.cn

Abdel-Hakim Bouzid

Professor
Fellow ASME
Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
e-mail: hakim.bouzid@etsmtl.ca

Jun Hong

Key Laboratory of Education Ministry for
Modern Design & Rotor-Bearing System,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: jhong@mail.xjtu.edu.cn

Zaoxiao Zhang

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zhangzx@mail.xjtu.edu.cn

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 15, 2017; final manuscript received May 21, 2018; published online June 18, 2018. Assoc. Editor: Sayed Nassar.

J. Pressure Vessel Technol 140(4), 041202 (Jun 18, 2018) (10 pages) Paper No: PVT-17-1111; doi: 10.1115/1.4040421 History: Received June 15, 2017; Revised May 21, 2018

Bolted flange joints are widely used in the nuclear power plants and other industrial complexes. During their assembly, it is extremely difficult to achieve the target bolt preload and tightening uniformity due to elastic interaction and criss-cross talks. In addition to the severe service loadings, the initial bolt load scatter increases the risk of leakage failure. The objective of this paper is to present an analytical model to predict the bolt tension change due to elastic interaction during the sequence of initial tightening. The proposed analytical model is based on the theory of circular beams on linear elastic foundation. The elastic compliances of the flanges, the bolts, and the gasket due to bending, twisting, and axial compression are involved in the elastic interaction and bolt load changes during tightening. The developed model can be used to optimize the initial bolt tightening to obtain a uniform final preload under minimum tightening passes. The approach is validated using finite element analysis (FEA) and experimental tests conducted on a NPS 4 class 900 weld neck bolted flange joint.

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References

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Figures

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Fig. 1

Analytical ring model

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Fig. 2

Displacement and rotation of flange along angular position

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Fig. 3

Finite element model of NPS 4 flange connection

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Fig. 4

Stress–strain curve of polytetrafluoroethylene (PTFE) gasket

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Fig. 5

Experimental bolted joint setup

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Fig. 6

Bolt tension variations during three passes with PTFE gasket under criss-cross pattern: (a) bolts 1, 3, 5, and 7 and (b) bolts 2, 4, 6, and 8

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Fig. 7

Comparison of bolt tension after the each tightening pass with PTFE gasket under criss-cross pattern

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Fig. 8

Bolt tension variations during three passes with PTFE gasket under sequential pattern: (a) bolts 1, 2, 3, and 4 and (b) bolts 5, 6, 7, and 8

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Fig. 9

Comparison of bolt tension after the each tightening pass with PTFE gasket under sequential pattern

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Fig. 10

Bolt tension variations during single pass with PTFE gasket under criss-cross pattern: (a) bolts 1, 3, 5, and 7 and (b) bolts 2, 4, 6, and 8

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Fig. 11

Comparison of bolt tension after the single tightening pass with PTFE gasket under criss-cross pattern

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Fig. 12

Bolt tension variations during single pass with PTFE gasket under sequential pattern: (a) bolts 1, 2, 3, and 4 and (b) bolts 5, 6, 7, and 8

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Fig. 13

Comparison of bolt tension after the single tightening pass with PTFE gasket under sequential pattern

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Fig. 14

Overshoot for each bolt at single tightening pass under criss-cross pattern

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Fig. 15

Overshoot for each bolt at single tightening pass under sequential pattern

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