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Research Papers: Design and Analysis

Verifying Structural Integrity of Repaired Cylindrical Pressure Vessels by Partitioning Method

[+] Author and Article Information
Husain J. Al-Gahtani

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

Mahmoud Naffa'a

Saudi Aramco,
Dhahran 31311, Saudi Arabia
e-mail: mahmoud.naffaa@yahoo.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 14, 2014; final manuscript received July 25, 2016; published online September 29, 2016. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 139(2), 021208 (Sep 29, 2016) (10 pages) Paper No: PVT-14-1203; doi: 10.1115/1.4034349 History: Received December 14, 2014; Revised July 25, 2016

Pressure vessels that undergo repairs are normally pressure tested to verify their structural integrity before returning into service. Conventionally, the entire vessel is pressure tested, according to the relevant construction code. In this paper, partitioning the pressure vessel is suggested as an equivalent alternative test arrangement, where pressure testing is limited to the zone where a repair has been performed. Use of such an arrangement would alleviate potential concerns associated with the conventional testing method. Procedures are provided to specify the position of the partition relative to the repair location, in order to maintain the state-of-stress to that achieved in a conventional pressure test. Validity of this approach has been demonstrated for a repaired full-circumferential welded joint in the wall of a cylindrical pressure vessel.

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References

ASME, 2013, “ ASME Boiler and Pressure Vessel Code, Section VIII,” American Society of Mechanical Engineers, New York.
ASME, 2015, “ Repair of Pressure Equipment and Piping,” American Society of Mechanical Engineers, New York, Standard No. ASME PCC-2–2015.
API, 2014, “ Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration,” 10th ed., American Petroleum Institute, Washington, DC, Standard No. API 510.
Al-Gahtani, H. , Khathlan, A. , Sunar, M. , and Naffa'a, M. , 2014, “ Local Pressure Testing of Spherical Vessels,” Int. J. Pressure Vessels Piping, 114–115, pp. 61–68. [CrossRef]
Cheta, A. M. , and Brodzinski, R. , 2007, “ Comparative Study for Stresses in Nozzle and Flange Welds Generated During Conventional Pressure Testing and Local Pressure Testing Using Bolted Devices,” ASME J. Pressure Vessel Technol., 129(4), pp. 775–780. [CrossRef]
Timoshenko, S. P. , and Woinowsky-Krieger, S. , 1970, Theory of Plates and Shells, McGraw-Hill, New York.
Wolfram, 2014, Mathematica, Version 10.0 Wolfram Research, Champaign, IL.
COMSOL, 2010, “ COMSOL Multiphysics,” Ver. 4.0a, COMSOL, Inc., Stockholm, Sweden.

Figures

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Fig. 1

A cylindrical vessel with partition plates

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Fig. 2

Schematic for discontinuity analysis at the plate-to-shell juncture

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Fig. 3

Decay of axial stress versus distance away from the partition for γ = 50

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Fig. 4

Decay of axial stress versus distance away from the partition for γ = 200

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Fig. 5

Decay of hoop stress versus distance away from the partition for γ = 50

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Fig. 6

Decay of hoop stress versus distance away from the partition for γ = 200

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Fig. 7

Common decay distance (Lmin)  of hoop and axial stresses away from the plate-cylinder junction

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Fig. 8

Effect of the geometric parameters on Lmin/a

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Fig. 13

Finite-element quarter model and boundary conditions

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