Lateral snaking of hot pressurized pipelines mitigation for Troll oil pipeline

Book · Sun Dec 01 04:00:00 EST 1996

OSTI ID:400924

Bruschi, R; Spinazze, M; Vitali, L ^[1]; Verley, R ^[2]

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1. Snamprogetti S.p.A., Fano (Italy)
2. Statoil, Trondheim (Norway)

The Troll Oil Pipeline operates at high temperature and pressure. Bar buckling is a potential hazard for the structural integrity due to the potential development of excessive bending, in particular in the proximity of the offshore tie-in point and in the first section of the route across the Norwegian Trench. The axial compressive force caused by operating loads, may be released in one location and give rise to large lateral deflections in a single buckle. Bending strains may reach unacceptable levels if the axial friction for sections adjacent to the buckled length is low, such that significant feed-in to the buckle occurs. At present, design guidelines and international codes do not cover these aspects satisfactorily. In this paper the susceptibility of the Troll Oil Pipeline to bar buckling is analyzed and discussed. A new mitigation method based on the concept of controlled feed-in, is presented. The worthiness of the proposed mitigation for the Troll Oil Pipeline to comply with the required structural integrity, is demonstrated through a series of analyses using analytical tools as well as finite element methods. The main findings, and particularly the calibration of analytical tools against finite element methods, are described and commented.

• OSTI ID: 400924
• Report Number(s): CONF-9606279--; ISBN 0-7918-1494-7
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
COMPUTER-AIDED DESIGN
DEFORMATION
NORTH SEA
NORWAY
NUMERICAL DATA
PETROLEUM
PIPELINES
PRESSURIZATION
STABILITY
STRESS ANALYSIS
THERMAL STRESSES
TRANSPORT