Advances in Subsea Pipeline Engineering and Technology: - download pdf or read online

By I. G. Craig, N. W. Nash, G. A. Oldfield (auth.), C. P. Ellinas (eds.)

ISBN-10: 940090617X

ISBN-13: 9789400906174

ISBN-10: 9401067643

ISBN-13: 9789401067645

Dr C P Ellinas complicated Mechanics & Engineering Ltd significant advances were completed in recent times in subsea pipeline layout and set up. Inspection, upkeep and service have additionally acquired a lot realization. the advance of marginal fields has introduced with it distinct difficulties, that have necessitated novel tools and suggestions. at the moment curiosity within the improvement of deepwater fields keeps with the advance of latest know-how. This convention has positioned emphasis in addressing advancements in pipeline expertise below 4 major headings: pipeline/seabed interplay; versatile pipelines; pipeline layout, fabrication and deploy; deepwater purposes. Advances in North Sea expertise over the past few years were involved ordinarily with marginal fields, small diameter pipelines and new fabrics, that are good lined within the first 3 themes. fiscal improvement of marginal fields calls for processing of oil and gasoline to happen no longer on the wellhead yet at present amenities, often far away. Hydrocarbons are hence usually transported at excessive strain and temperature in small diameter pipelines, which have to be secure via trenching. even if, such operational perform has delivered to the fore an issue that previously used to be of little hindrance particularly, upheaval buckling.

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Additional info for Advances in Subsea Pipeline Engineering and Technology: Papers presented at Aspect ’90, a conference organized by the Society for Underwater Technology and held in Aberdeen, Scotland, May 30–31, 1990

Example text

In conclusion, the problem of relating these results to the realities of the construction process are considered in a section concerned with seabed survey interpretation. THE UPHEAVAL PHENOMENON A pipeline laid upon an uneven foundation, will bear down most heavily upon the high spo~ or crests of the foundation proflle, less so in concave areas. This is due to a combination of negative buoyancy, and the natural tendency of the pipeline to return to its original straight form as constructed. THE EFfECT OF IMPERFECTION SHAPE ON UPHEAVAL BUCKLING BEHAVIOUR 53 The introduction of elevated temperature T and internal pressure p will induce an axial compressive driving force given, in fully constrained regions, by Peff = aEAT where + p(1-2v)Di 2 / 4 To ...

Disturbed and if spoil has been returned to the trench by a backfill blade the spoil strength may be much nearer its undisturbed shear strength and probably lumpy. Because of the much higher angles of repose of these soils (up to 90 degrees) when compared to sandy soils (say 10 degrees) only about one fifth the volume of soil needs removing to achieve the same trench depth. 5 metre clearance beneath a pipeline requires a sUbstantial increase in trench width, in cohesive soils it will mean excavating downward in high shear strength "virgin soil" - a completely different problem.

At other times subsea conditions reversed this trend and left pipelines exposed on the surfaoe and the battle was on to backfill scours, support freespans and rebury exposed sections. At a time when the objectives were always to lay, bury and test pipelines to bring fields on stream as fast as possible and to keep pipelines buried, there was little incentive to develop methods of reversing the process or to dig up live pipelines. When oil and gas production moved northwards into the much deeper Northern North Sea different seabed materials were encountered, silts, silty clays and boulder clays.

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Advances in Subsea Pipeline Engineering and Technology: Papers presented at Aspect ’90, a conference organized by the Society for Underwater Technology and held in Aberdeen, Scotland, May 30–31, 1990 by I. G. Craig, N. W. Nash, G. A. Oldfield (auth.), C. P. Ellinas (eds.)


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