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CORROSION MANAGEMENT OF THE TROLLTVET GAS PIPELINES
| 题名： | CORROSION MANAGEMENT OF THE TROLLTVET GAS PIPELINES |
| 作者： | I. T. Knox, Snr. Materials and Corrosion Engineer, Troll Phase I, A/S Norske Shell J. Guijt, Head of Offshore Pipelines, Troll Phase I, A/S Norske Shell |
| 关键词： | pipeline；management；lines；roll；corr；sion；processing；inhibition；alternative；development |
| 摘要： | A/S Norske Shell is development operator for the Troll gasfield (Phase I), Europe's largest offshore gasfield, located some 60 km from the Norwegian west coast. In 1990, the Troll Unit partners opted for onshore gas processing as the preferred development alternative, with processing on the platform being limited to removal of free water only. Gas will be produced from 1st October 1996 onwards and will be transported to an onshore processing plant via two 36" carbon steel 'wet gas' pipelines. The design life of the pipelines is 50 years and the minimum operational life has been set at 30 years, in line with the current gas sales contract. The wet gas pipelines are designed such that a limited amount of internal corrosion is acceptable. Hence, an active corrosion management system is required. The paper discusses the various interlocking elements of the corrosion management system, including the corrosion control method selected for the pipelines - injection of monoethylene glycol to reduce corrosivity such that the available corrosion allowance is sufficient for the planned life. A comprehensive corrosion monitoring system, based on the use of several complementary techniques, is an integral part of the corrosion management system. The key components of the corrosion monitoring system, namely, 'on-line' wall thickness measurement and the use of ultrasonic-based intelligent pigs, are highlighted. Finally, details arc given regarding two fail-back options, gas cooling and inhibition/pH modification, which can be implemented in the event that measured corrosion rates arc higher than anticipated. |
| 报告类型： | 科技报告 |
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