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Title: Acoustic Emission Testing Of Buried Gas Pipelines
Author: Edward A. Lehman
Source: American Gas Association 1974
Year Published: 1974
Abstract: Between the mid-nineieen-leens and mid-nineieen-fifties, approximately 500 miles of steel pipe, four inches in diameter and larger, were installed by oxyacetylenc joint welding techniques in what is now the Philadelphia Electric Companys gas distribution system. Though the quality of many of these welds would be questioned by todays standards, the incidence of failure has been small, averaging about one a year for the past seven or eight years. These failures emphasized the need to develop an inspection technique to moniior these pipelines, locate critical conditions, and make corrections before a failure occurred. The testing system should not require excavating and exposing each weld for inspection.

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