Standpipe demand
Standpipe demand
(OP)
Hello
I have a building with a class III standpipe system that is also fully covered with an autotmic sprinkler system (combined system). I'm hydraulically calculating the system and the HMD floor has 5 standpipes. How many of those am I supposed to supply?
The Code says:
5-9.1.2* Hydraulic Calculation Procedure.
Hydraulic calculations and pipe sizes for each standpipe shall be based on providing 250 gpm (946 L/min) at the two hydraulically most remote hose connections on the standpipe and at the topmost outlet of each of the other standpipes at the minimum residual pressure required by Section 5-7. Common supply piping shall be calculated and sized to provide the required flow rate for all standpipes connected to such supply piping, with the total not to exceed 1250 gpm (4731 L/min).
I would greatly appreciate it if someone helped interpret this clause, especially "and at the topmost outlet of each of the other standpipes".
Thanks
I have a building with a class III standpipe system that is also fully covered with an autotmic sprinkler system (combined system). I'm hydraulically calculating the system and the HMD floor has 5 standpipes. How many of those am I supposed to supply?
The Code says:
5-9.1.2* Hydraulic Calculation Procedure.
Hydraulic calculations and pipe sizes for each standpipe shall be based on providing 250 gpm (946 L/min) at the two hydraulically most remote hose connections on the standpipe and at the topmost outlet of each of the other standpipes at the minimum residual pressure required by Section 5-7. Common supply piping shall be calculated and sized to provide the required flow rate for all standpipes connected to such supply piping, with the total not to exceed 1250 gpm (4731 L/min).
I would greatly appreciate it if someone helped interpret this clause, especially "and at the topmost outlet of each of the other standpipes".
Thanks





RE: Standpipe demand
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: Standpipe demand
What if:
My building is fully sprinklered, and has only one standpipe that feeds 4 outlets all on the HMD floor. Do I have to flow all 4 at 250gpm?
My building is fully sprinklered, and has only one standpipe that feeds 4 hose outlets, one at each floor. Do I have to flow all 4 at 250 gpm?
Another thing is;
I'm trying to get a grip on this. Correct me if I'm wrong, I have to flow (250x2) gpm at the HMD standpipe, then I have to flow 250 gpm at each additional standpipe up to 1250 (1000 if sprinklered)? This I understand but,
What if the HMD standpipe has more than 2 hose outlets? Is the priority for the extra flow given to the additional hose outlets on the HMD standpipe? or the other standpipes?
RE: Standpipe demand
RE: Standpipe demand
I'm trying to understand how the code applies in different scenarios.
RE: Standpipe demand
The calculation procedure is pretty straightforward in NFPA 14. Just follow it as outlined and you should be good to go.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: Standpipe demand