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RE: Pipe Support Forces for Transient Flow[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Pipe Support Forces for Transient Flow
- From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
- Date: Fri, 17 Feb 2006 00:26:43 -0500
I agree with what you have said, except that it seems to result in "no consideration of transient pressures" if a detailed transient pressure analysis is not done. I would rather at least have a "minimum percentage of maximum operating pressure" as an unbalanced force, to ensure that at least some unbalance has been accounted for.
William C. Sherman, PE
From: Mark D. Anderson PE [mailto:mark(--nospam--at)alaskaengineer.com]
Sent: Thursday, February 16, 2006 2:43 PM
Subject: Re: Pipe Support Forces for Transient Flow
I believe the reason for the absence of minimum design forces/guidelines to quantify dynamic transients is that the problem(s) defy generalization.
Rapid opening valves produce the same type of effects as rapid closing valves, and the transient characteristics depend on many factors, generally including rate of opening/closing, pressure differential, speed of sound in the fluid medium, distance between changes in piping direction (even though the problem is not one of fluid momentum), mass of the piping between changes in piping direction, presence of any surge attenuating components, etc.
A non-conservative "generality" is potentially dangerous...
Good field data to measure the pressure transient(s) is a luxury that is hard to beat, if you can live with the experience of getting it...
Mark D. Anderson PE
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