The primary purposes of any pipeline maintainance programme are to maintain flow capacity and prolong the life of piping system. The two most common procedures for internal maintainance are chemical treatment and mechanical cleaning using pigs. Although the procedures differ in nature and effect, they are often used together to offer an efficient and lower-cost approach to controlling significant pipeline problems. An unterstanding of how each method works will give a clearer picture of how to combine the two for a more-effective, comprehensive pipeline maintainance programme. Chemicals are most effective and efficient when used primarily to treat problems at the pipe surface, such as the formation of wax deposits, bacteria colonies, and corrosion. Pigs are best used to prepare the pipe surface for the application of chemicals, to 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 maintainance programme, it is possible to keep corrosion damage to a minimum, maximize the operating effiency of pipelines, and reduce chemical treatment costs. Recommandations shold be kept in mind when developing a chemical treatment and pigging programme: Conduct a thorough analysis of the pipeline's operating conditions, identifying all possible flow, deposition, or corrosion problems. Identify the best chemical for the problem, and the most effective dosage and method of application. Start with a clean pipeline. Remove unwanted liquids, scales, and wax deposits with the appropriate type of pig. Whenever possible, apply chemicals in periodic batch treatments using pigs. Establish a well-defined maintainance programme using low-concentration chemical injection between batching, and frequent pigging. Select pig design that are well suited for the application, and keep the wear parts in good, usable condition.
Pigging and chemical treatment of pipelines
Einsatz von Rohrbürsten und chemische Behandlung von Rohrleitungen
Corrosion Prevention and Control ; 45 , 2 ; 35-45
1998
11 Seiten, 4 Bilder
Article (Journal)
English
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