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Comparative Study for Stresses in Nozzle and Flange Welds Generated During Conventional Pressure Testing and Local Pressure Testing Using Bolted Devices

[+] Author Affiliations
Ayman M. Cheta

BP Texas City Site, Texas City, TX

Richard Brodzinski

BP Refining Technology Group, Naperville, IL

Paper No. PVP2005-71042, pp. 141-147; 7 pages
doi:10.1115/PVP2005-71042
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications, and Components
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4192-8 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

Weld repairs and alterations of pressure vessels and piping built to ASME codes may require pressure testing to prove the integrity of the weld and/or design. In recent years, several designs were developed to employ bolted devices when performing local pressure testing of flange-to-nozzle, flange-to-pipe and nozzle-to-shell attachment welds. Due to the cost and equipment down time associated with performing a full conventional pressure test and the desire to reduce repair costs, several petrochemical companies adopted the use of such devices. The purpose of this paper is to compare the stress values and stress distribution associated with both techniques. The advantages and disadvantages of both approaches are discussed and the conclusions are supported by a practical example.

Copyright © 2005 by ASME

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