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. [...]... of the Alyeska pipeline can be made CONCLUSIONS 1 All Alyeska pipeline corrosion is external and occurs in buried pipe 2 Corrosion has been most prevalent in areas that tend to be wet 185 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology Fig.l Trans-Alaska pipeline pump station facility Fig.2 Corrosion inspection of the Trans-Alaska pipeline 186 Please... RJ.Purinton, 1989 Gelly pigging Venezuela's Nurgas pipeline DS Team Magazine, February, pp.26-28 177 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm This page intentionally left blank Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Corrosion inspection of the Trans-Alaska pipeline CORROSION INSPECTION OF THE TRANS-ALASKA PIPELINE THE ALYESKA Pipeline Service... Split-Merge on www.verypdf.com to remove this waterm Gellypig technology for pipeline conversion (e) the pipeline has been operating since 1st January, 1990, with no significant problems REFERENCES 1 Dowell Schlumberger Inc, 1987 Pipeline Services Manual, December 2 R.J.Purinton and S.Mitchell, 1987 Practical applications for gelled fluid pigging, Pipe Line Industry, March, pp.55-56 3 Crane Engineering Division,... problems in disposal However, due to the changing composition of the gel as it passes through the pipeline, precautions must be taken to properly dispose of the used gels and materials The pipeline was successfully hydrotested after the gellypig service Drying of the pipeline was accomplished by Missouri Pipeline using methanol, mechanical (cup) pigs, and many foam swab pigs Overall, the execution of... experience Two successive runs of the NKK ultrasonic corrosion pig in Alyeska's pipeline offer an opportunity to compare results against known pipe conditions In 1989, Alyeska exposed 6,300 linear ft of buried pipeline, and in 1990 11,800ft was excavated to inspect the condition of the pipeline and make repairs where necessary At each pipeline excavation, Alyeska had specific procedures which are prescribed... the degreaser to perform adequately The pipeline began natural gas service on 1 st January, 1990, (the scheduled start-up date) There have been no problems to report to date There have been relatively few filter changes, with these typically occurring when the 175 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology pipeline is at or near maximum flowrate,... this waterma Corrosion inspection of the Trans-Alaska pipeline Fig.3 Loading the NKK ultrasonic corrosion pig Fig.4 The IPEL magnetic-flux pig 187 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterma Pipeline Pigging Technology 3 Data collected to date indicates corrosion has been most severe in specific areas of the 800-mile pipeline 4 Based on the field excavations to date, ultrasonic... remove this waterm Ethylene pipeline cleaning ETHYLENE PIPELINE CLEANING, INTEGRITY AND METAL-LOSS ASSESSMENT THE ALBERTA Gas Ethylene Company (AGEQ, in co-ordination with Novacorp International Consulting Inc (Novacorp), successfully performed an intensive internal cleaning and inspection programme on their ten-year old 180-km (110-mile) ethylene pipeline Throughput in the pipeline had been reduced... product is shipped 180km by pipeline to other users and cavern storage facilities near Edmonton The NPS12 (12-in diameter) steel pipeline was put into operation in 1979, and typically operates at near 9000kPa (1200psi) and 5°C (40°O- In 1989, after 10 years of operation, AGEC decided to perform an 189 Please purchase PDF Split-Merge on www.verypdf.com to remove this waterm Pipeline Pigging Technology internal... decommissioning or recommissioning its 12-in pipeline; no company had successfully internally-inspected an entire ethyiene pipeline; the polymer problem was not clearly understood Decisions were based on pressure-drop information and polymer samples retrieved in filters Consequently, AGEC relied heavily on the experience of other ethyiene pipeline companies and pigging contractor expertise to develop the