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RE: Pipe Supports (Tee type)

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Regarding deflection of pipe supports, if the pipe stanchion is intended to laterally support the piping but it does not have adequate rigidity, it is questionable whether the pipe stanchion supports the piping or the piping supports the pipe stanchion (laterally).  Thus, as Tom Hunt points out, the lateral loads could be inadvertently transferred to elements not designed for the applied forces. 
 
Regarding forces at pipe bends, if the piping has welded or bolted flange joints (restrained joints), the forces due to steady state flow should not be too large.  However, the transient flow forces due to start-up or valve closure can be significant - there was recent discussion of such forces on this list.  Typically piping is fixed at a single point along a run with that support designed as the anchor point.  Do not fix two points along a straight run, or strain due to pressure and/or thermal effects can induce large forces.  (If you don't fix at least one point and there are unbalanced flow forces, there will be pipe movement that could be damaging.)
 

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com

 


From: Dellies, Teresa M. [mailto:Teresa.Dellies(--nospam--at)c-b.com]
Sent: Thursday, March 30, 2006 9:29 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Pipe Supports (Tee type)

Don't forget to take into account the tremendous thrust induced into the pipes where bends occur (whenever the flow is interrupted or at the startup of the system.  These forces will govern your design in most cases.) I am assuming your pipes will be carrying fluids. Also, do not FIX your pipeline to the pipe supports unless you have designed for these forces. I have seen many pipe support structural failures due to the pipeline being fixed to the support where the thrust forces were (apparently) not taken into account.
teresa dellies, p.e. | transportation programs | carter & burgess, inc. | office:  817.735.2835 | fax:  817.735.6148 | email:  teresa.dellies(--nospam--at)c-b.com 
 


From: Tom.Hunt(--nospam--at)fluor.com [mailto:Tom.Hunt(--nospam--at)fluor.com]
Sent: Wednesday, March 29, 2006 4:40 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Pipe Supports (Tee type)


Bhavin,

Other than possibly some P-Delta effects on your pipe support the limiting drift is generally a requirement of the piping system.  If this is primarily a straight run pipe it may not be a big issue, however, if the pipe turns down and connects to a piece of equipment (i.e. pump, compressor, etc.) then you may be introducing excessive loads into the pipe flange connection.  You should seek drift limits from whoever is designing the piping system.

Thomas Hunt, S.E.
Fluor



"Bhavin Shah" <bhavin.design(--nospam--at)gmail.com>
03/29/2006 09:03 AM
Please respond to seaint
To
"seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
cc
Subject
Pipe Supports (Tee type)





Dear all,

This is regarding design of Pipe Stanchions (Steel structure)
supporting heavy pipes at certain elevations.

                For supporting the individual pipes, generally Tee type (cantilever
column) of Pipe Stanchions are used. As the stanchions are flexible in
both the directions, lateral deflection at the top of the stanchion
may be quite high as compared to the pipe displacement. Hence, are
there any limits or general guidelines (say above 7.0m) that above the
particular height Frame type of stanchion should be used.

Thanks,

Bhavin Shah

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