By I. G. Craig, N. W. Nash, G. A. Oldfield (auth.), C. P. Ellinas (eds.)
Dr C P Ellinas complex Mechanics & Engineering Ltd significant advances were accomplished in recent times in subsea pipeline layout and deploy. Inspection, upkeep and service have additionally bought a lot awareness. the advance of marginal fields has introduced with it precise difficulties, that have necessitated novel equipment and options. in the mean time curiosity within the improvement of deepwater fields keeps with the improvement of latest know-how. This convention has positioned emphasis in addressing advancements in pipeline expertise lower than 4 major headings: pipeline/seabed interplay; versatile pipelines; pipeline layout, fabrication and install; deepwater purposes. Advances in North Sea expertise over the past few years were involved generally with marginal fields, small diameter pipelines and new fabrics, that are good lined within the first 3 issues. fiscal improvement of marginal fields calls for processing of oil and gasoline to ensue now not on the wellhead yet at latest amenities, often far away. Hydrocarbons are hence frequently transported at excessive strain and temperature in small diameter pipelines, which must be secure via trenching. although, such operational perform has dropped at the fore an issue that previously was once of little situation particularly, upheaval buckling.
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Additional resources 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
The desiqn hot water flushing temperature at the wellhead end of the flowline was 45°C (±9°C) • 25 UPHEAVAL BUCKLING MITIGATION BY HOT WATER FLUSHING A detailed explanation of how these temperatures were derived is given in Reference 3. Electric Heaters and Power Generation To achieve the calculated flowline discharge temperature the required flowline inlet and platform fl ushi ng pump di scharge temperatures were assessed. flushing flow rate obviously has a large impact on these temperatures. The A design flow rate of 200 gpm with an absolute maximum of 250 gpm was selected to allow a margin of at least 50 gpm to be discharged into the sea in the normal way.
V. sills consortium Resource Management Ltd. 19 Denmore Ind. , Aberdeen ABSTRACT The paper gives a brief history of pipeline burial in the North Sea to establish the parameters for deburial and indicates why this activity is increasing. A review of past and present deburial techniques and equipment is given together with their most important features. The paper concludes with a look at future developments. 33 Volume 24: C. P. ), Advances in Subsea Pipeline Engineering and Technology, 33-50. © 1990 Society for Underwater Technology.
The decommissioning and removal of redundant pipelines such as that undertaken for Wintershall in the Dutch K15 sector show that it is no easy matter to extract even a small pipeline once settled into the seabed. The embrittlement of the pipeline material and the effects of corrosion, erosion and fatigue may not allow the deeper pipelines to be simply pulled out of the seabed without continual buckling and breaking. Prior deburial may be required to reduce loading. 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.
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.)