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Title: Purging-Safely And Economically
Author: David W. Bean
Source: American Gas Association 1970
Year Published: 1970
Abstract: Air trapped and traveling in a natural gas pipeline must be prevented regardless ofthe cost or effort. A positively safe, quick. and convenient method of controlling the purging of air from natural gas pipelines is the subject of this paper. Actually A.G.A. suggests the more precise word clearing to describe displacing air from a pipeline by rapidly introducing gas. This assumes a high pressure source of gas (1100 psi or more) whose volume is several times larger than the pipeline to be cleared. My subject, then, is a very small segment of the much larger problem of purging as defined by A.G.A. Consider for example: Purging a 10-mile section of 24-inch pipeline using pressures of 250 or 300 psi can use as much as 2800 Mcf of gas.

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