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Research Papers: Design and Analysis

Design-Focused Stress Analysis of Cylindrical Pressure Vessels Intersected by Small-Diameter Nozzles

[+] Author and Article Information
Faisal M. Mukhtar

Department of Civil and
Environmental Engineering,
King Fahd University of
Petroleum and Minerals,
Dhahran 31261, Saudi Arabia
e-mail: faisalmu@kfupm.edu.sa

Husain J. Al-Gahtani

Department of Civil and
Environmental Engineering,
King Fahd University of
Petroleum and Minerals,
Dhahran 31261, Saudi Arabia
e-mail: hqahtani@kfupm.edu.sa

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 4, 2015; final manuscript received May 6, 2016; published online September 28, 2016. Assoc. Editor: Kunio Hasegawa.

J. Pressure Vessel Technol 139(2), 021205 (Sep 28, 2016) (11 pages) Paper No: PVT-15-1264; doi: 10.1115/1.4033598 History: Received December 04, 2015; Revised May 06, 2016

In a related work previously carried out by the authors, finite element analysis of cylindrical vessel–cylindrical nozzle juncture based on the use of thin shell theory, due to the fact that the intersecting nozzle sizes are moderate to large, have been presented. Such analysis becomes invalid in cases when the nozzles are small in sizes which may result in nozzles whose configuration violates the validity of shell assumption. As a result, use of solid elements (based on theory of elasticity) in modeling the cylindrical vessels with small-diameter nozzles is presented in the present paper. Discussions of the numerical experiments and the results achieved are, first, given. The results are then compared with the prediction by other models reported in the literature. In order to arrive at the overall design charts that cover all the possible ranges of nozzle-to-vessel diameter ratio, the charts for the vessels with moderate-to-large-diameter nozzles are augmented with those of cylindrical vessels intersected by small-diameter nozzles developed in this work.

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Topics: Design , Nozzles , Vessels
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References

Figures

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Fig. 1

Cylindrical vessel–cylindrical nozzle connection

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Fig. 2

Quarter model for the cylindrical vessel–cylindrical nozzle problem. (a) Geometry and (b) discretization.

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Fig. 3

Vessel–nozzle juncture details

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Fig. 4

Variation of the four types of stresses in the main vessel for a typical vessel–nozzle juncture with Rv/Tv=50, Tn/Tv=0.5, and Rn/Rv=0.05

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Fig. 5

Variation of the four types of stresses in the nozzle for a typical vessel–nozzle juncture with Rv/Tv=50, Tn/Tv=0.5, and Rn/Rv=0.05

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Fig. 6

Comparison with other established SCF models for Rv/Tv=50. (a) Tn/Tv=0.25, (b) Tn/Tv=0.5, (c) Tn/Tv=0.75, (d) Tn/Tv=1.0, (e) Tn/Tv=1.25, and (f) Tn/Tv=1.5.

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Fig. 7

Comparison with other established SCF models for Rv/Tv=100. (a) Tn/Tv=0.25, (b) Tn/Tv=0.5, (c) Tn/Tv=0.75, (d) Tn/Tv=1.0, (e) Tn/Tv=1.25, and (f) Tn/Tv=1.5.

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Fig. 8

Comparison with other established SCF models for Rv/Tv=150. (a) Tn/Tv=0.25, (b) Tn/Tv=0.5, (c) Tn/Tv=0.75, (d) Tn/Tv=1.0, (e) Tn/Tv=1.25, and (f) Tn/Tv=1.5.

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Fig. 9

Design charts for vessel–nozzle juncture with Rv/Tv=50. (a) SCF for the cylindrical vessel and (b) SCF for the cylindrical nozzle.

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Fig. 10

Design charts for vessel–nozzle juncture with Rv/Tv=75. (a) SCF for the cylindrical vessel and (b) SCF for the cylindrical nozzle.

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Fig. 11

Design charts for vessel–nozzle juncture with Rv/Tv=100. (a) SCF for the cylindrical vessel and (b) SCF for the cylindrical nozzle.

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Fig. 12

Design charts for vessel–nozzle juncture with Rv/Tv=125. (a) SCF for the cylindrical vessel and (b) SCF for the cylindrical nozzle.

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Fig. 13

Design charts for vessel–nozzle juncture with Rv/Tv=150. (a) SCF for the cylindrical vessel and (b) SCF for the cylindrical nozzle.

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