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Title: Leaks And Blowouts Caused By Pitting Can Be Controlled In Gas Pipelines
Author: J. D. Tarver, R. G. Asperger, J. E. Davis
Source: American Gas Association 1987
Year Published: 1987
Abstract: The type of corrosion that leads to most leaks and blowouts of gas gathering pipelines is internal corrosion. More specifically, the corrosion is a pitting attack on the bottom of the pipeline near the 6:00 position. The most severe areas of pitting are in sags or dips, particularly on the downsteam riser, where trapped hquids repeatedly mechanically wash the pipe. In the early stages of the pipeline corrosion, its pits are isolated from one another. They generally are growing in the continuously, water-wet zones of the pipeline. These conditions are common in lines with stratified flow and less common in lines with annular flow. A pipeline that shows leaks from pitting is already severely harmed by corrosion and will be very difficult to protect from further pitting damage. PUs have thinned the metal so badly that even low, general corrosion rates of 1-2 mpy (0.0254-0.0508 mm/y) are too high to stop leaks.

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