3.3.23 ('13) System working pressure. The maximum anticipated static
(nonnflowing) or flowing pressure applied to the sprinkler system components
exclusive of surge pressures and exclusive of pressure from the fire department
connection. Isn't the occasional test run of an electric pump a "surge
pressure"?
Ron F
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of John
Denhardt
Sent: Tuesday, February 18, 2014 1:58 PM
To: [email protected]
Subject: RE: Static Pressure/Working Pressure
My first reaction is the churn pressure is the normal working pressure. If you
follow NFPA 20, the jockey pump is to be set at the churn pressure of the fire
pump. So normally, the jockey pump can maintain the churn pressure on the
system.
Now to install a PRV for 3 psig????????????
In most of the areas we work, we also have to adjust to the pressure ratings to
the high hydraulic gradient for the water supply.
John
John August Denhardt, P.E., FSFPE
Strickland Fire Protection Incorporated
5113 Berwyn Road
College Park, Maryland 20740
Office Telephone Number: 301-474-1136
Mobile Telephone Number: 301-343-1457
FIRE SPRINKLERS SAVE LIVES - Can you live without them?
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of
[email protected]
Sent: Tuesday, February 18, 2014 2:50 PM
To: [email protected]
Subject: Static Pressure/Working Pressure
3.8.1.9.2 Static Pressure. The pressure that exists at a given point under
normal distribution system conditions measured ...
We have a project with an electric pump and when combined with the current
water supply the churn pressure is 178 psi. A nationally known engineering firm
wants us to install PRV's on the lowest level of the building because of the 3
psi. Our position is that the pressure only exists at churn and that is similar
to an overnight pressure surge in a municipal water system. The over pressure
will be compensated for by the pressure relief valves once the pump stops. Are
we being overly loose with our interpretation of "normal" or is the engineering
firm correct?
Ron F
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