Welded steel wye branches are a key component of most water projects where flows must be divided. They are also a specialty item that requires many engineering considerations. Historically, the design of wye branches has been studied by many agencies over the years and design guidance can be obtained from several sources; 1. American Water Works Association (AWWA). (2004). Steel Water Pipe: A Guide for Design and Installation (M11), Fourth Edition and the referenced document that supports Manual M11; Design of Wye Branches for Steel Pipe, by H. S. Swanson, et al (References 1. & 2.) 2. Stress Analysis of Wye Branches, by F. 0. Ruud, Engineering Monograph No. 32, Bureau of Reclamation, Denver, CO., 1964. (Reference 3.)
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