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Title: Dot Class Location Changes And Their Effect On Pipeline Operations And Economics
Author: K. W. Yoder
Source: American Gas Association 1978
Year Published: 1978
Abstract: A class location change, as defined in the Minimum Federal Safety Standards for Gas Lines creates problems for a natural gas transmission company. Capacities of pipelines must be reduced or effective action taken to insure that overpressure at a given location will not occur, Pressure gradient control can be an effective means of complying with the rules and regulations imposed by a class location change. The economics of hydrostatic testing, replacement, reduction in capacity or pressure gradient control must be compared with each, before decisions can be made for action should class location changes occur. These points are discussed in this paper as well as descriptions and examples of pressure gradient control.

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