Download e-book for kindle: Advances in Subsea Pipeline Engineering and Technology: by I. G. Craig, N. W. Nash, G. A. Oldfield (auth.), C. P.

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 accomplished lately in subsea pipeline layout and install. Inspection, upkeep and service have additionally got a lot recognition. the advance of marginal fields has introduced with it particular difficulties, that have necessitated novel equipment and options. for the time being curiosity within the improvement of deepwater fields keeps with the advance of latest expertise. This convention has positioned emphasis in addressing advancements in pipeline know-how lower than 4 major headings: pipeline/seabed interplay; versatile pipelines; pipeline layout, fabrication and deploy; deepwater purposes. Advances in North Sea know-how over the past few years were involved typically with marginal fields, small diameter pipelines and new fabrics, that are good lined within the first 3 themes. monetary improvement of marginal fields calls for processing of oil and gasoline to ensue now not on the wellhead yet at present amenities, frequently far away. Hydrocarbons are hence usually transported at excessive strain and temperature in small diameter pipelines, which must be secure via trenching. notwithstanding, such operational perform has delivered to the fore an issue that previously was once of little drawback particularly, upheaval buckling.

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Extra 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

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50 ADVANCES IN SUBSEA PIPELINE ENGINEERING AND TECHNOLOGY Perhaps the most important development is an excavation system designed to operate in a IIflyingll mode under remote control from the surface. M. Richards Lloyd's Register, London ABSTRACT The upheaval buckling behaviour of heated and pressurised submarine pipelines is reviewed, with particular attention to the role of foundation imperfections. Exact solutions for continuous foundations are discussed, and the results utilised to produce empirical relationships for analysis and design purposes.

It soon became apparent that the temperature of the produced water was insufficient to satisfy the design parameters and heat exchangers and generators would be required to boost the flushing water temperature. Since the temperature drop between the heater and the flowline inlet was approximately 5°C, the heater design specification was to heat the produced water at the rate of 200 gpm from an inlet temperature of 50°C (assumed for design purposes) to an outlet temperature of 75°C. Figure 6 also shows the inferred temperature profiles along the flowline based on recorded inlet and outlet temperatures for the hot water flushing operation and projected temperatures for the operating condition.

With the flowline up to temperature the survey vessel carried out a detailed side scan and ROV visual survey of the post hot water flush flowline to establish the extent of the lateral buckling. Following receipt of the recorded changes to the flowline alignment, the trenching vessel deployed the plough onto the seabed astride the pipe and commenced trenching. UPHEAVAL BUCKLING MITIGAnON BY HOT WATER FLUSHING 29 During concept evaluation it had been predicted that there could be some movement of the pipe ahead of the plough as it systematically removed the frictional restraint on the pipe in the process of forming the trench.

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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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