In power plants, engineering analysis is used to design piping systems for steam and water hammer events. A simple and effective approach based on hand calculation was proposed by E.C. Goodling1 which has been widely used in the industry to estimate fluid loads for pipe stress analysis and design of piping restraints. His approach provides a conceptual understanding of many factors that control fluid loads, which can be used both to perform approximate checks of more detailed computer solutions, and to identify parameters that can be changed to optimize system designs. In Goodling’s work, the possibility of reflection waves affecting fluid loading is mentioned. However, this effect was not explored and is often neglected when simple hand estimates of fluid loads are made. This paper looks at the effects reflection waves from pressure vessels or large headers may have on steam/ water hammer loads. A few sample problems are solved with the aid of a Method of Characteristic (MOC) computer program and compared to solutions found using the Goodling approach. It is shown that neglecting reflection waves may lead to non-conservative loads (by up to a factor of two). The effects of other critical parameters (e.g., pressure pulse rise rate) are also discussed.

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