You may be looking at it too narrowly (ie looking at the symptom of
high pressure). In order to get high pressures, you have either (or
both) thermal expansion which your relief valve will address or
pressure surges. If you are getting hammered by a 400 psi spike, a
relief valve won't help. Back in my consulting days, we called it a
transitional pressure wave when we evaluated the Air Force One hangar
after they had a hydrant act like a missile (a low elevation model).
Roland
PS: Pete - give me a shout so we can talk about NFPA 25
On May 14, 2008, at 11:54 AM, Larrimer, Peter A wrote:
I have a facility in North Carolina who is having pressure
fluctuations
in the water supply such that their CPVC systems are bursting due to
overpressures. They have recorded pressures that easily exceed the
175lb limits of the systems.
What would the recommendations of the forum be to keep the pressures
down to a reasonable level? (Pressure regulating valve?)
Will any hydraulics analysis be necessary when any device is installed
in the system?
Anyone in North Carolina want to contact me concerning this work?
Thanks in advance.
Pete Larrimer
VA
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