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Title: Pressure Drop And Rate Of Flow Line Break Detection
Author: Richard W. T. Skinner
Source: American Gas Association 1979
Year Published: 1979
Abstract: The housing boom which followed World War II started a period of suburban sprawl across the countr). This resulted in the rapid growth of interstate pipeline systems, and the encroachment by subdivisions on the rights-ofway of high pressure cross country pipelines which had been constructed in rural areas. With this increase in population density adjacent to the pipelines, ihe need for a method of automatic detection and isolation of pipeline breaks was recognized. The oldest and still most widely used systems of automatic line break detection are the Rate of Flow System and the Rate-of- Pressure-Drop System, Both systems were developed around a pneumatic diaphragm type differential pressure pilot valve, which opens at some preset pressure differential, to pressurize an instrument gas line to a selector valve controlling power gas to one more valve operators.

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