L.R. Aalund Managing Editor-Technology Polypropylene is attracting increasing attention as a highly desirable component in oil and gas pipeline coating systems. Though long-term in ground or underwater experience is limited with such systems, actual completed projects have been in the field since 1986. The earliest anti-corrosion coatings for buried pipelines were bitumen-type coatings: asphalt mastic and enamel, and coal tar enamel. The asphalt coatings absorb water to a greater degree than the coal tar enamel coating, but both are subject to cracking, leading to contact of water with the pipe, and coating disbandment. Lat...

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