| Résumé : |
This article begins by summarizing the historical development of anticorrosion coatings for buried and subsea pipelines, from coal tar and asphalt enamels to fusion-bonded epoxies and polyolefins and, most recently, field joint coatings. It discusses the major factors likely to influence the continuing development of pipeline coatings by manufacturers and the selection of these coatings by end-users, particularly in the oil and gas industries. These factors include pipeline construction costs, health and safety considerations, and higher pipeline operating temperatures. In the future, external protective coatings are likely to be considered more in terms of their impact upon whole life pipeline costs than as individual cost items. Health and safety restrictions can be expected to result in the continuing decline in the use of coal tar and asphalt enamels and increasing specification of fusion-bonded epoxy (FBE) and three-layer FBE-polyolefin coatings. Furthermore, field joint coating work is likely to rely more on closed-circuit blast-cleaning systems, and enclosed automatic coating application equipment. If the upward trend in pipeline operating temperatures is to continue, then a major advance in the technology of pipeline coating materials will be required rather than further development of current technology. |
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