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Research Papers: Design and Analysis

A Study on the Behavior of Single- and Twin-Gasketed Flange Joint Under External Bending Load

[+] Author and Article Information
N. Rino Nelson

Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: nrinonelson@gmail.com

N. Siva Prasad

GITAM University,
Hyderabad 502329, India
e-mail: sivacae@yahoo.co.in

A. S. Sekhar

Professor
Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: as_sekhar@iitm.ac.in

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 9, 2016; final manuscript received May 8, 2017; published online August 1, 2017. Assoc. Editor: Reza Adibiasl.

J. Pressure Vessel Technol 139(5), 051204 (Aug 01, 2017) (8 pages) Paper No: PVT-16-1130; doi: 10.1115/1.4037070 History: Received August 09, 2016; Revised May 08, 2017

Gasketed flange joints are widely used in pressure vessels and piping systems. They are subjected to bending load due to differential thermal expansion, wind load, self-weight, etc., in addition to assembly and internal fluid load. Most of the flange designs are based on equivalent pressure method to include the effect of external bending loads. The behavior of gasketed flange joint is complex due to the nonlinear hysteretic behavior of gasket material and contact interfaces between joint members. It becomes more complex when the joint is subjected to bending load at elevated temperatures. In the present work, performance of a flange joint has been studied under internal pressure and external bending load at elevated temperatures. A 3D finite element model is developed, considering the nonlinearities in the joint due to gasket material and contact between its members along with their temperature-dependent material properties. The performance of joint under different bolt preloads, internal fluid pressures, and temperatures is studied. Flange joint with two gaskets (twin-gasketed flange joint, TGJ) placed concentric is also analyzed. The results from finite element analysis (FEA) are validated using four-point bending test on gasketed flange joint. The sealing and strength criteria are considered to determine the maximum allowable bending moment at different internal fluid temperatures, for both single- and twin-gasketed flange joints with spiral wound gasket. Twin gasket is able to withstand higher bending moment without leakage compared to single gasket. Results show that the allowable load on flange joint depends on operating temperature and gasket configuration.

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References

Figures

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Fig. 1

Loads acting on flange joint

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Fig. 2

Geometric configuration of flange joint

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Fig. 3

Stress displacement relation for gasket material [1]

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Fig. 4

Boundary condition for gasketed flange joint

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Fig. 5

Temperature distribution in gasketed joint at 473 K

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Fig. 6

Stress distribution in TGJ for 4.5 kN·m bending moment at 310 K

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Fig. 7

Variation of gasket stress against bending moment for different fluid temperature in SGJ and TGJ for F = 20 kN

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Fig. 8

Variation of flange stress against bending moment in SGJ for F = 20 kN

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Fig. 9

Variation of flange stress against bending moment in TGJ for F = 20 kN

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Fig. 10

Experimental test rig for four-point bending test of gasketed flange joint

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Fig. 11

Validation of flange strains in TGJ for F = 20 kN at room temperature

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Fig. 12

Comparison of experimental longitudinal flange strain from SGJ and TGJ for F = 20 kN at room temperature

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Fig. 13

Allowable bending load in SGJ and TGJ for different fluid temperature at 20 kN and 5 MPa

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