Unusual Occurrence Causes Leak in High-Pressure Underground Gas Pipeline

A gas leak was detected on a 56-in (1.4-m) crosscountry gas pipeline from a small orifice on the bottom of an indentation. The pipeline had an epoxy primer and a hot polyethylene coating, and was only four years old. Metallurgical tests on the hole and theoretical calculations indicated that the pipeline had been penetrated by a bullet before being coated. This may be the first such case recorded, and would have been difficult to prove if an explosion had taken place.

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