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Title: Location Class Determination And Pipeline Surveillance
Author: John E. Thompson,
Source: American Gas Association 1971
Year Published: 1971
Abstract: Location class determination became important in November 1970 when the Regulations for Transportation of Natural and Other Gas by Pipeline became effective, under jurisdiction of the Department of Transportation. The four categories of pipeline class locations are a measure of the number or density of buildings or areas for human occupancy, lying within 660 feet of a pipeline. Each class is assigned a safety design factor, which establishes the maximum allowable operating pressure in its area and is determined by a study of aerial photos plus field examination. A proposed time schedule of two years is allowed for pipeline operators to comply with the regulations and a program for continuing surveillance is required to maintain compliance as conditions change.

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