As a follow up to this, I ran the calcs both with an adjusted pressure
and by creating the fictitious underground.
The made up underground with the fire pump as the source created a lower
overall demand.
So, I'm more comfortable using the adjusted water pressure for the
calcs. When a final set of utility plans is made available the calcs
will be adjusted accordingly. At this point I like the idea of going
with the more stringent of the two ideas.
I appreciate all the help, and thanks Todd for pointing out the obvious
fact that I missed about the static pressure.
/Thank you,
Bob Knight, CET III//
/*/Fire by Knight, LLC/*/
//208-318-3057/
FIREBYKNIGHT
On 5/6/2024 3:18 PM, Fpdcdesign wrote:
There is no friction loss at 0 gpm. The static at the riser will be
your churn pressure plus the elevation gain.
In my opinion, you should include the mains as you describe them as
part of the calculation.
Todd Williams
Fire Protection Design/Consulting
Stonington, CT
860-608-4559
On May 6, 2024 at 4:57 PM, <Bob Knight <mailto:b...@firebyknight.com>>
wrote:
I have a project where the complete underground plan has not been
provided, yet.
What I do have is a fire pump house with a recent fire pump test.
The fire pump house is about 2,100 feet from the project site. It is
elevated about 54 feet higher as well.
I do have the underground loop around the building, so I was going to
use the connection point at the loop for the underground from the
pump house as the source point.
The pump test shows 152 psi @ 0 gpm and 101 psi @ 1500 gpm.
The elevation gain in pressure is 23.38 psi.
The friction loss through the 2,100 feet of pipe and 16 or so
fittings and valves, totals 2,372 feet.
This came out to 21.24 psi of friction loss, assuming 800 gpm of flow
including 250 gpm hose.
I'm adding the elevation gain and subtracting the friction loss from
the pump test.
This leaves me with 154.14 psi @ 0 gpm and 103.14 psi @ 1500 gpm.
I'm just going to use the numbers from the pump test and re-verify
everything at a future date.
Does this sound reasonable?
--
/Thank you,
Bob Knight, CET III//
/*/Fire by Knight, LLC/*/
//208-318-3057/
FIREBYKNIGHT
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