Hi all,
I have a bit problem in calculating my water demand for a theory project
like below:
Assume that there is a factory protected with a wet pipe sprinkler system, 4
fire boxes and 4 external hydrants on main ring.
According to NFPA-13 i conclude that for example I should consider 20
sprinklers active and from my hydraulic calculations I concluded that my
sprinklers demand would be 643 Gpm.
I also assumed 2 fire boxes active and from my hydraulic calculations I
concluded that for example flow rate for first fire box is 142 Gpm and second
is 156 Gpm, So the total demand for hose streams is (142+156) = 295 Gpm.
I also have 4 external hydrants on main ring, should I assume that at least
one hydrants will work at the same time with my sprinklers and 2 fire boxes? If
the answer is yes, then I will active one hydrant and my hydraulic calculations
I concluded that my hydrant demand is 860 Gpm.
So I have following demands:
1- Wet pipe sprinkler system ------------------------------- Demand: 643 Gpm
2- Hose streams (Fire boxes) ------------------------------ Demand: 295 Gpm
3- External Hydrants on main ring------------------------- Demand: 860 Gpm
Now I conclude that my total water demand is (643 + 295 + 860 )= 1798 Gpm.
My questions are as below:
A- Should I assume that my external hydrants will work at the same time with
sprinklers and 2 fire boxes? and should I include them in total water demand?
B- Should I assume exactly 295 Gpm for my hose streams? or NFPA has standard
for water demand of hose streams( Ex. 250 or 500 Gpm) ?
C- What is my right total demand in your idea?
I know that my questions may surprise you, becuase I am a beginner, I would
appreciate if you answer in details to know where I am wrong.
Thanks,
Reza
---------------------------------
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