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Research Papers: Design and Analysis

Stress Analysis of Packed Stuffing-Boxes

[+] Author and Article Information
Mehdi Kazeminia

Department of Mechanical Engineering,
Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
e-mail: kazeminia.mehdi@gmail.com

Abdel-Hakim Bouzid

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 27, 2014; final manuscript received December 16, 2014; published online February 24, 2015. Assoc. Editor: Wolf Reinhardt.

J. Pressure Vessel Technol 137(5), 051205 (Feb 24, 2015) (9 pages) Paper No: PVT-14-1100; doi: 10.1115/1.4029524 History: Received June 27, 2014

Packed stuffing-boxes are mechanical sealing systems that are extensively used in pressurized equipment such as valves and pumps. Yet there is no standard design procedure in use to verify their mechanical integrity and leak tightness. It is only recently that standard test procedures to qualify packing materials have been suggested for adoption in both North America and Europe. Nonetheless the assessment of the structural integrity of the housing requires a well-documented design procedure to insure safe use of packed stuffing-boxes. While the packing contact stress with the side walls is predictable using existing models there is no analytical methodology to verify the stresses and strains in the stuffing-box housing. This paper presents an analytical model that analyzes the stresses and strains of the stuffing-box components including the packing rings. The developed model is validated both numerically using FEM (finite element method) and experimentally on an instrumented packed stuffing-box rig that is specially designed to measure the structural integrity and leakage tightness of different packing materials.

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Figures

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Fig. 1

Simplified packed stuffing-box with the main components

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Fig. 2

Free body diagram of the stuffing-box housing

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Fig. 3

FE model of the experimental packed stuffing-box

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Fig. 4

Packed stuffing-box test rig

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Fig. 5

Comparisons of the housing hoop strains between analytical and numerical results for three gland load cases

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Fig. 6

Stuffing-box housing subjected to contact pressure. Dimensions are in millimeters.

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Fig. 7

Comparison of hoop strains at the housing cylinder outside surface with the three methods (analytical, numerical, and FEM)

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Fig. 8

Longitudinal stress distributions at the housing outer surface

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Fig. 9

Hoop stress distribution at the housing outer surface

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Fig. 10

Hoop strain at the housing inner surface

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Fig. 11

Radial stress distribution at the housing inner surface

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Fig. 12

Longitudinal stress distribution at the housing inner surface

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Fig. 13

Hoop stress distribution at the housing inner surface

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