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HotPipe JIP: Design Guidelines for HP/HT Pipelines

[+] Author Affiliations
Leif Collberg, Kim J. Mo̸rk

Det Norske Veritas, Ho̸vik, Norway

Erik Levold

Statoil S.A., Trondheim, Norway

Luigino Vitali

Snamprogetti S.p.A., Fano, PU, Italy

Paper No. OMAE2005-67523, pp. 683-690; 8 pages
doi:10.1115/OMAE2005-67523
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 3
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4197-9 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

Recent development plans envisage the transport of hydrocarbons at temperature and pressure conditions far more severe than in past projects. Technical feasibility of certain inter field lines was put in doubt as a consequence of application of design guidelines currently in force. This fact gave rise to a critical review of design criteria. The HotPipe Project is a Joint Industry Research and Development Project, whose overall objective is to prepare a DNV Recommended Practice to be used in structural design of high temperature/high pressure pipelines. The DNV-RP will cover most practical cases where pipelines are subjected to high internal pressure and high temperature (HP/HT). The design criteria are based on the application of reliability methods to calibrate the partial safety factors in compliance with the safety philosophy established by DNV OS F101. The overall objective was pursued by performing the following subprojects: • Pipe Capacity: Experimental tests were carried out and FE models were developed aiming at establishing the failure mechanisms of thick pipes subjected to internal pressure, bending moment and axial compression under monotonic and cyclic loading conditions. • Pipe Response: Analytical tools and FE models were developed for studying the localization of buckling pattern for the envisaged pipeline scenarios i.e. pipelines laid on even sea bed, pipelines laid on uneven seabed and buried pipelines. • Mitigation Measures. Study of relevant mitigation measures and associated criteria for preventing/reducing/controlling additional pipeline bending. • Design Guideline. Preparation of the design guideline. The Joint Industry Project Hotpipe did recently finish the work and issued an internal confidential project guideline. This is in the process of being converted into a public DNV Recommended Practice, ref. DNV-RP-F110, which will be published later this year. It provides procedures and criteria to fulfill this functional requirement, to ensure the integrity of the pipeline in the post buckling condition. This paper will describe the procedures and criteria in the project guideline. It is expected to be identical in the coming RP issued for industry hearing. This paper describes the main structure and the covered design scenarios of the DNV-RP, particularly: • Pipelines exposed on even seabed, where thermal expansion may be accommodated by lateral snaking; • Pipelines on uneven seabed corresponding to even seabed; and • Pipelines on bottom of trenches/covered by natural or artificial backfill.

Copyright © 2005 by ASME
Topics: Design , Pipelines

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