The FPE may have adopted the idea from Montgomery County, MD. SInce
they identify the water supply and modified it such that it can not
support the job, did they spec a tank and pump as part of the job?
Roland
On Sep 29, 2008, at 6:51 AM, Arthur Tiroly wrote:
Dear Forum, I will try this again.
On several projects we are finding engineered water supply
availability
coming from the major chain store's [art] FP engineers. Recently the
engineer used a city water flow test from a Cleveland 16" supply and
assumes
that the closest elevated water tank is empty and reduces static and
residual by 30 ft = 13 psi. That becomes the new flow test for
hydraulic
calcs. He calls this the due diligence water supply for hydraulic
calcs
Even good water supplies become inadequate for some of the bigger
box stores
with flow demands of 1500-2000 gpm. This is NOT Walmart, Lowes or Home
Depot. Where are these requirements to down grade a water supply
coming
from? Should this be the norm? Then we need a 10 psi cushion to the
reduced
residual.
Is this the insurance company requirement?
[art]
Asking the engineers to back up a statement seems hopeless. "We need
1900
gpm at 50 psi at the riser flange including hose streams." But the
hydrants
are outside so the sprinkler demand is 1400 at the riser I say.
"NO, we
need the 1900 at the flange." This is an FPE.
Comments please.
Art Tiroly
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