Pipelines 2020
How to Reduce Bending Moments on Large Butterfly Valves Belowground
Publication: Pipelines 2020
ABSTRACT
When projects require direct buried installation of large butterfly valves, special installation, factors must be considered to maintain valve integrity, and prevent damage to the pipeline. In response to a request from AWWA’s steel pipe and stainless-steel pipe committee chairs, a task force on large valve installation meeting was first held at ACE17 in Philadelphia to discuss the issue of valve deflection; since then the committee has had multiple meetings and, most recently at ACE19, the task force discussed additional mitigating solutions to limit loading of valves by thereby controlling deflections. One of the solutions proposed by the AWWA task force committee was the addition of grooved, flexible yet restrained couplings on either side of the valve. This paper will address the benefits of the addition of grooved, flexible yet restrained couplings, located on either side of the large butterfly valves belowground. Piping stress analysis, using CAESAR II software that utilizes an FEA analysis using beam elements with 6 degrees of freedom at each node, was performed on 24”, 48”, 72”, and 96” steel pipe sections subject to a rigid restraint on the left, a guided restraint on the right near each side of the valve, 100 psig water pressure, and a 2” vertical displacement. The moments on the fixed end (valve end) were calculated with and without pairs of flexible couplings. When couplings were used, the moment on the valve was reduced by about two-thirds when compared to the case where pipe was installed without couplings.
Get full access to this article
View all available purchase options and get full access to this chapter.
REFERENCES
American Water Works Association (AWWA). (2017). Steel Pipe – A Guide for Design and Installation (M11), Fifth Edition, page 52, Eq. 4-4. Available at https://www.awwa.org/Portals/0/files/publications/documents/M11LookInside.pdf?ver=2019-08-19-145338-290.
American Water Works Association (AWWA). (2017). Steel Water Pipe, 6 In. (150 mm) and Larger (ANSI/AWWA C200-17), page 9, Table 1. Available at https://doi.org/10.12999/AWWA.C200.17.
Ballun, John. (2019). “Task Force on Large Valve Installation.” In Minutes of American Water Works Association meeting 9 June 2019. Denver, CO.
Hudson, D., Trinker, G., AlMasri, O., and Christian, D. (2012) White paper. Modeling Victaulic Couplings in Piping System Stress Analysis Programs. WP-18, Victaulic. Available at https://www.victaulic.com/assets/uploads/literature/White%20Paper/WP-18.pdf.
Information & Authors
Information
Published In
Pipelines 2020
Pages: 158 - 171
Editors: J. Felipe Pulido, OBG, Part of Ramboll and Mark Poppe, Brown and Caldwell
ISBN (Online): 978-0-7844-8319-0
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Aug 6, 2020
Published in print: Aug 6, 2020
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.