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

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

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 obtained a lot recognition. the advance of marginal fields has introduced with it exact difficulties, that have necessitated novel tools and suggestions. for the time being curiosity within the improvement of deepwater fields maintains with the advance of recent expertise. This convention has positioned emphasis in addressing advancements in pipeline know-how below 4 major headings: pipeline/seabed interplay; versatile pipelines; pipeline layout, fabrication and install; deepwater purposes. Advances in North Sea know-how over the past few years were involved regularly with marginal fields, small diameter pipelines and new fabrics, that are good coated within the first 3 themes. fiscal improvement of marginal fields calls for processing of oil and fuel to occur now not on the wellhead yet at current amenities, frequently a long way away. Hydrocarbons are hence usually transported at excessive strain and temperature in small diameter pipelines, which must be secure via trenching. even if, such operational perform has delivered to the fore an issue that previously was once of little challenge particularly, upheaval buckling.

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Read or Download 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 PDF

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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

Sample text

However/ 49 PIPELINE DEBURIAL However a more realistic answer is to set parameters that would satisfy the majority of operators requirements and least compromise equipment design. The author would welcome comment from conference delegates regarding their own company's requirements •. For commercial reasons the several companies engaged in developing and building new systems cannot openly discuss their designs. presently underway and funded by the EEC and major oil and gas The stimulus for the programme is that market " forecasts for 1990 pipeline deburial predict a two fold c~mpanies.

PIPELINE DEBURIAL 39 IMPORTANT FACTORS IN DEBURIAL Just as the methodology of burying a pipeline is heavily influenced by the soil characteristics so is that of deburial. Deburial is not a simple reversal of the burial technique as the parameters are different. A pipeline will not float neatly back to seabed level when uncovered. Burial of a 1 metre diameter pipeline in 2 metres of mobile sand by fluidisation simply required the pipeline to sink under its own weight into the ground. No trench was actually made.

Lo ·1 x -> PIPELINE AND FOUNDATION NOTATION Detailed analysis of these imperfections is complicated by the variety of intermediate equilibrium confJgllI'ations which must be considered (Figure 2). ) COMPLETE CONTACT Ib) POST UPHEAVAL However, some general observations to do with upheaval response may be made which relate mainly to the magnitude of imperfection amplitude. For the isolated prop, which may be regarded as a continuous imperfection of very short wavelength (Figure 2a), behaviour is smooth and continuous until upheaval occurs when contact is lost (Figure 3a).

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