The increasing incidence of corrosion induced failures query the efficiency of corrosion prevention measures and/or their monitoring techniques. Of concern too, is the phenomenon of twelve o'clock corrosion and the subsequent rupture. This indicated that the inhibitor was not protecting the upper surface of the pipe wall which could be possibly averted by batching a slug of inhibitor solution ahead of a pig or between pigs on regular (e.g. monthly) basis.
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