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Coping with High and Low Pressures of Transient Flow

by Homer Murphey, Gifford-Hill-American Inc, Dallas, TX, USA,
Lee Freese, Gifford-Hill-American Inc, Dallas, TX, USA,



Document Type: Proceeding Paper

Part of: Water for Resource Development

Abstract:

Conditions exist in most long distance water pipelines, such that abnormal but inevitable occurrences will cause transient flow. Often the most crucial conditions for consideration by an engineer designing a long distance pipeline, is the high positive pressures and the below atmosphere pressures developed by the rapid velocity changes during transient state flow. The most frequently encountered conditions that incur these extreme high and low pressures and practical and common methods employed to control or cope with these conditions are discussed. Structural design considerations and limiting factors for pipe reaction to pressure forces are examined. In any pressure pipeline system, consideration must be given to reacting unbalanced thrust forces. Methods of reacting these forces are discussed as well as the development of pipeline configurations that will reduce the magnitude of the forces.

Subject Headings: Transient flow | Pressure pipes | Water pipelines | Water hammer | Transient response | Structural design | Pipeline hydraulics

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