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Large diameter penstock branch design

Large diameter penstock branch design

Large diameter penstock branch design

(OP)
Hello

I'm looking into the design of large diameter branch (59")off a 120" penstock with an internal pressure of 50psi. I'm having trouble finding a suitable guide for calculating the stresses at the branch/penstock interface.

We are planning to use do some FEA but I would like something to back it up. I've looked into using the WRC 107/297 bulletins but I don't think they are very accurate for such large d/D ratios (.49).

Any suggestions?


 

RE: Large diameter penstock branch design

Some of the best, modern manual calculations/design of penstocks is due to the pioneering work/research for the "Boulder Canyon Project", aka The Hoover Dam; particularly the document:

Boulder Canyon Project Final Reports; Part V - Technical Investigations.  Bulletin 5 - Penstock Analysis and Stiffener Design.  US Department of the Interior.  1940.

Other references, which are largely based on the above work, include:

Design of Wye Branches for Steel Pipe. Journ. AWWA 47:6:581 (June 1995)

AISI Steel Plate Engineering Data Volume 4

AWWA M11

ASCE MOP No. 79 - Steel Penstocks

Bureau of Reclamation Engineering Monograph 3 - Welded Steel Penstocks, available @
http://www.usbr.gov/pmts/hydraulics_lab/pubs/EM/EM03.pdf

Structural Mechanics of Buried Pipe - ISBN 0849323959; Chapter 18 - Special Sections

 

RE: Large diameter penstock branch design

(OP)
Canadieng  

Thanks so much for your comments and list of documents, much appreciated. I've managed track many of them down and have some of in house.

I also found the following thread that had some suggestions (many of the same):

http://cr4.globalspec.com/thread/39974/Pressure-Pipe-Opening-Reinforcement

Of particular interest is the "Structural Mechanics of Buried Pipes" by Watkins and Anderson, that has a section on the design of wyes.

Looks like I have some reading to do.

Regards

tb
 

RE: Large diameter penstock branch design

;) That was me in a former life. (user XMech that is)

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