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RE: Pipe support design

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FWIW my 2 cents. If the pipe is not steel you need to be careful with the
vibrations and spans. I have used 8' spans generally without problems in all
pipe materials. The bends are a problem if you do not have steel and or the
legs are short. If plastic or fiberglass should look at anchors as in
classic civil thrust blocks at the bends. I guide or use u bolts for loads
lateral to the pipe. Longitudinal loads can be debated as friction is
available and the pipe is tied some place to some piece of equipment or
fixture. If you have a hot pipe a stress analysis may be considered for
thermal and real anchor points and guides defined by a math model for the
pipe. An old rule of thumb is for 4" dia and 400 degrees, bigger and hotter
run the analysis. 8' spacing on 4" steel piping should not be a problem. My
back ground is as a refinery fixer upper guy.
Bob Hanson, S.E.

-----Original Message-----
From: Suresh Acharya [mailto:engineer(--nospam--at)amexol.net]
Sent: Wednesday, April 25, 2001 2:12 PM
To: seaint(--nospam--at)seaint.org
Subject: Pipe support design


I have a 4" dia pipe supported at 8" o.c. Maximum pressure in the pipe
could be as high as 200 psi; and the pipe has several 90-degree bends.
Does the water hammer phenomenon have any effects other other than simply
increasing the pressure in the pipe and hence the force at the supports;
are there any vibrations associated with water hammer that would increase
forces in the support? I appreciate any reference to this kind of problem.
Thanks.
Suresh Acharya,P.E.




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