Technical Brief

A Pipe Bend Subject to a Uniformly Distributed Radial Force

[+] Author and Article Information
Joseph M. Mazzeo

696 W. 10th Street, P.O. Box 192,
Pittsburg, CA 94565
e-mail: joe.mazzeo@NRG.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 26, 2012; final manuscript received November 30, 2014; published online March 6, 2015. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 137(3), 034501 (Jun 01, 2015) (6 pages) Paper No: PVT-12-1108; doi: 10.1115/1.4029286 History: Received July 26, 2012; Revised November 30, 2014; Online March 06, 2015

The effects of a distributed radial load on an elbow or bend within a piping system, caused by changes in momentum due to fluid flow, can be represented by one or more point loads. Simplified methods result in inaccurate results in some cases. Modeling the bend with multiple nodes and forces increases accuracy. The method presented here will provide accurate results, comparable to breaking up the bend into many nodes and forces. A number of example analyses are presented for comparison with simplified modeling methods and the potential importance of considering momentum change forces in some power piping geometries are discussed.

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Grahic Jump Location
Fig. 1

Curved beam cantilever

Grahic Jump Location
Fig. 2

Calculation of Y displacement

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Fig. 3

Calculation of axial force

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Fig. 4

Calculation of shear force

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Fig. 6

Plot of comparison model



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