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Research Papers: Other (Seals, Manufacturing)

An Experimental-Numerical Procedure for Stuffing Box Packing Characterization and Leak Tests

[+] Author and Article Information
Mohammed Diany

 Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadamdiany@yahoo.com

Abdel-Hakim Bouzid

 Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadahakim.bouzid@etsmtl.ca

J. Tribol 133(1), 012201 (Dec 02, 2010) (8 pages) doi:10.1115/1.4002929 History: Received April 28, 2010; Revised October 26, 2010; Published December 02, 2010; Online December 02, 2010

The sealing of valve stems is ensured by the traditional systems of packed stuffing boxes. The performance of this type of sealing system, which is also used in rotating equipment, is dependent on the radial contact pressures generated by the packing axial compression. The mechanical behavior of a packing seal is characterized by the transmission ratio of the radial stress over the axial stress known as the lateral pressure coefficient, which is one of the required parameters used to select packing seals. However, the modeling of the packed stuffing box requires the knowledge of other packing seal mechanical characteristics such as compression modulus and Poisson’s ratio. In this paper, the mechanical characteristics of packing seals are obtained using a hybrid experimental-numerical procedure. The experimental study is carried out on an instrumented stuffing box packing test bench. The tests results of the experiments are coupled to the ones obtained by a finite element simulation of the test rig to determine the packing seal mechanical characteristics. Two packing types are used: one based on Teflon and the other one based on flexible graphite. In addition, leak rates are measured for different axial compressive stresses and gas pressures in order to estimate the tightness performance of such seals.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 14

Leakage test with four PTFE packing rings

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Figure 15

Hoop strain variation

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Figure 16

Axial displacement versus axial compressive stress

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Figure 17

The packing ring number’s effect on the leak rate

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Figure 13

Leakage test with four FG packing rings

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Figure 12

Material characteristics for PTFE packing

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Figure 11

Material characteristics for FG packing

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Figure 10

Lateral pressure coefficient for FG and PTFE

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Figure 9

Relationship between hoop strain and σr for PTFE packing

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Figure 8

FE hoop strain at housing OD for PTFE packing

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Figure 7

Experimental hoop strain at housing OD

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Figure 6

Hoop strain at housing OD for FG packing

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Figure 5

Compression test

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Figure 4

Housing FE model

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Figure 3

Schematic of the test bench

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Figure 2

The stuffing box packing test bench

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Figure 1

FG and PTFE packing rings

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