You seem to be ignoring the UFC/IFC fire flow demands for Chapter 9, based
upon building area and construction. Your site Hydrants must supply this
demand if you are under UFC or IFC.
Thom McMahon
Firetech, Inc.
2560 Copper Ridge Dr
Steamboat Springs, CO 80488-2136
Tel: 970-879-7952
Fax: 970-879-7926
----- Original Message -----
From: "Reza Esmaeili" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Thursday, September 13, 2007 5:41 AM
Subject: Water demand for fire protection system!
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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