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Limit Load Analysis of API 620 Tank Roof-Shell Junction

[+] Author Affiliations
Mahendra D. Rana, Victor E. Bergsten

Praxair, Inc., Tonawanda, NY

Yogeshwar Hari

University of North Carolina at Charlotte, Charlotte, NC

Paper No. PVP2002-1243, pp. 283-291; 9 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • Pressure Vessel and Piping Codes and Standards
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4650-4
  • Copyright © 2002 by ASME


The compression ring at a tank’s roof-shell junction has been designed using the API 620 [1] rules. The geometrical configuration of the ring is non-conventional compared to the typical shapes recommended in API 620. In order to verify the structural integrity of the roof-shell junction, a plastic FEA was conducted to establish the maximum allowable working pressure (MAWP) using a limit load analysis procedure. The FEA results indicated that the tank’s roof-shell junction’s MAWP is 18.7 psi which exceeds the calculated MAWP of 15 psi using the API 620 rules. This paper presents the comparisons of the MAWPs calculated using the API 620 rules and the plastic FEA.

Copyright © 2002 by ASME



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