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Technical Specification for Subsea Pipelines Alternative Criteria Based in Fracture Mechanics

[+] Author Affiliations
Petrônio Zumpano Júnior, Guilherme Victor Peixoto Donato, Eduardo Hippert Júnior, Tiago Bohn Kaspary

PETROBRAS, São Paulo, SP, Brazil

Paper No. PVP2008-61198, pp. 1283-1289; 7 pages
doi:10.1115/PVP2008-61198
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME

abstract

Offshore pipeline laying significant high costs are strongly related to the duration of vessel operations. Even though DNV-OS-F-101 requires an Engineering Critical Assessment (ECA) only when expected total longitudinal strain is above 0.4%, contractors usually prefer to launch lines by using alternative defect acceptance criteria for mechanized girth welds based on fracture mechanics approach in order to save time. BS-7910 standard is worldwide acknowledged for fracture and fatigue analysis, but it requires operators to specify additional criteria in the overall ECA methodology for submarine pipelines. In 2006 DNV-RP-F108 was issued establishing new testing methods based in SE (T) and pipe segment specimens as a way of achieving a more realistic estimation of pipeline toughness. Nowadays, a lot of research has been carried out on testing methodology that will likely lead to a SE (T) testing standard. However, many aspects of pipeline launching and operation must be defined for ECA analysis: operators should establish all the cyclic loads to be considered both for installation and operation period assessment; the approach of in-service fatigue may be determinant for the final allowable crack size; sour service conditions may imply that Paris law constants are not valid for in-service VIV and hydrogen charged SE (B) specimens will give fracture toughness results representative of the material in sour conditions. This paper addresses the premises, based in Petrobras previous experience, for establishing a technical specification in order to carry out an ECA with alternative criteria for subsea pipeline or riser girth welds, based in fracture mechanics approach.

Copyright © 2008 by ASME

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