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Pro-Active Fitness for Service of 19 Meter Diameter NGL Surge Sphere

[+] Author Affiliations
Michael P. Walsh

Saudi Arabian Oil Company

Paper No. PVP2002-1306, pp. 15-22; 8 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • Fitness for Service Evaluations and Non-Linear Analysis
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4653-9
  • Copyright © 2002 by ASME


To minimize costly down time, pro-active in lieu of reactive FFS assessments offer distinct advantages since the acceptable/unacceptable defect geometries and limitations are determined prior to the actual inspection. General Corrosion, LTAs and pitting were detected in the lower accessible sections of this 2″ average thickness sphere designed to ASME Section VIII, Division 2. API-510 and API-579 Levels 1, 2 and 3 were utilized to evaluate the documented defects in a comparison study. The defect geometries were then extrapolated to unacceptable levels to be used as a go/no-go reference tool for the remainder of the sphere and future inspections. Excel spread sheet numerical calculations and FEA non-linear analyses are employed. A significant increase in service life and defect tolerance over API-510 is realized.

Copyright © 2002 by ASME



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