Tài liệu PIPELINE PIGGING TECHNOLOGY- P5 doc

Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. [...]... The pipelines run parallel to each other approximately 100m apart in water depths of up to 155m Approximately halfway to St.Fergus there is the 115 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig.l Total Oil Marine pic's North Sea pipelines 116 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm 10 years of intelligent pigging. .. 40-in diameter, 810-km pipeline from Sleipner to Zeebrugge will be the longest and largest subsea pipeline ever built The pipeline was originally designed with a platform at the mid-point for tie-in of a future compressor platform and to enable the line to be pigged in two sections Recent advances 129 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig.l... intelligent-pig inspection Fig.3 (below) Geometry pig specification 119 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology A summary of the different methods of checking internal geometry of pipelines is given in Fig.3 INTELLIGENT PIGGING Soon after start-up in 1979-80, the market of inspection pigs was investigated and tests made with the reputable pigs of the... 48% of wall thickness INVESTIGATIONS Detailed study of the pipeline history archives resulted in a common fabrication aspect for all the 11 features The pipeline was originally fabricated in 12-m lengths and then joined or double-jointed to make 24-m lengths 125 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology prior to shipping offshore to the laybarge... remove as much debris as possible This is especially true for removing wax from oil pipelines Total Oil Marine would also like to stress that good record-keeping with respect to pipeline history is vital in aiding the pipeline engineer to investigate fully the importance of any defects or features located during an intelligent pigging programme ACKNOWLEDGEMENTS We wish to thank the owners of the Frigg Transportation... www.verypdf.com to remove this waterm Pipeline Pigging Technology Corrosion coupons and probes are located at either end of an offshore pipeline, and will not provide information in the areas of greatest interest, i.e downstream of a bend or at a low point in the gas line where liquid can accumulate We therefore believed, since start-up, that we needed to monitor the pipelines' internal condition as accurately... schedule in intelligent pigging technology have made it possible to inspect the total 810-km gas pipeline as one pigging section This makes it possible to eliminate the intermediate platform and make substantial savings, based on the conclusion that conventional pigs will be capable of running this length during the precommissioning and commissioning operations Conventional pigging is not envisaged... vehicles was not sufficiently accurate to determine trends unless the trends were so marked that questions concerning the pipeline integrity would have to be asked This was not the case for the Frigg pipelines We are looking for small features which could lead to identifying trends in the pipelines' condition The Linalog defect grading system is given in Fig.4, but we consider it to be too wide a spread... pig and the Pipetronix ultrasonic pig 120 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm 10 years of intelligent pigging Fig.4 Defect grading system 121 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterma Pipeline Pigging Technology Again, pull-through trials were performed and evaluated to decide which was to be chosen for the Frigg lines Both the pigs... external pipe wall is rare 122 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm 10 years of intelligent pigging Fig.5 Advantages and disadvantages of magnetic pigs 123 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterma Pipeline Pigging Technology Fig.6 (top) Advantages and disadvantages of ultrasonic pigs Fig.7 (bottom) Typical double joint prior to shipment