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. [...]... pig Using a worn or 233 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig 5 Batch between pigs inefficient pig is one of the more common and costly mistakes made in pipeline maintenance Liquids and deposits can be left in the pipeline, although frequent pigging is performed It is also possible to lose costly chemicals when batching, due to excess... This obviously saves tremendous amounts of time and money, and especially so where the pipeline is of considerable length SUMMARY The art of pigging an operational pipeline is not an exact science, especially in respect of pipelines which do not conform to normal parameters It is hoped that this paper will give pipeline operators food for thought, and to let them know that help can be on hand in situations... www.verypdf.com to remove this waterm Specialist pigging techniques ferrous debris is particularly high, then a more aggressive approach is required so that the debris can be removed more efficiently and therefore more quickly We are aware of one pipeline which was so heavily contaminated with ferrous debris that the pipeline operator carried out a total of 43 separate pigging runs using a standard magnetic... www.verypdf.com to remove this waterm Pipeline Pigging Technology less than the inside diameter of the pipeline Protruding radially from the circumferential edge of each disc are a number of steel pins which are screwed into threaded housings anchored into the disc The length of the pins is such that the diameter across any two opposite pins is greater than the inside diameter of the pipeline by up to lin, depending... treatment and pigging programme: (1) conduct a thorough analysis of the pipeline' s operating conditions, identifying all possible flow, deposition or corrosion problems; 234 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pigging and chemical treatment (2) identify the best chemical for the situation, the most effective dosage and method of application; (3) start with a clean pipeline. .. intervention system which would enable additional pipelines to be tied into a main trunk line without decommissioning the complete pipeline In a typical North Sea scenario, we may have a 200+km pipeline which has been dried at the time of commissioning down to the dewpoint of -20°C, and operated in a controlled manner since then The time required to recommission the pipeline back to the acceptable standards... help distribute the chemicals evenly throughout the pipeline, and to minimize the volume of chemicals needed by removing bulk deposits and entrapped fluids If chemical treatment and pigging are combined in a well-developed preventive-maintenance programme, it is possible to keep corrosion damage to a minimum, maximize the operating efficiency of the pipeline, and reduce chemical treatment costs The following... injection between batching, and frequent pigging; (6) select pig designs that are well suited for the application, and keep the wear parts in good, usable condition REFERENCES 1 G.R.Marshall, 1988 Cleaning of the Valhall offshore oil pipeline, Offshore Technology Conference paper no.5743 2 E.E.Sperling, M.Craighead, D.Dunbar, and G Adams, 1989 Vertiline - a new pipeline inspection service Presented at... forward by the pig itself; it will be left behind in the line For actual removal of this loosened wax or scale from the pipeline we use the pressure by-pass pig Brush pig This pig was developed for a client operating aviation spirit pipelines where cleanliness is extremely important The pipelines were being cleaned using standard articulated pigs carrying steel wire brushes which were relatively successful... stationary A further use for the shunting pig is in pipelines which are particularly hostile to pigs, thereby requiring a much stronger construction of pig The extended length and increased number of cups and discs substantially improves its performance in difficult conditions 241 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology "Easy loading" pig This pig