NFPA 14 Class I Manual Combined Standpipe
NFPA 14 Class I Manual Combined Standpipe
(OP)
Per 2010 NFPA 14, 7.10.1.2.2 I'm providing 250 Hose allowance at all three (3) 2-1/2" Hose Connections of a Class 1 Standpipe System.
per 7.8.1, I'm providing 100psi at the most hydraulically remote single 2-1/2" connection.
The System is Manual and Combined with two separate Wet pipe Sprinkler Systems.
per 7.8.1, I'm providing 100psi at the most hydraulically remote single 2-1/2" connection.
The System is Manual and Combined with two separate Wet pipe Sprinkler Systems.





RE: NFPA 14 Class I Manual Combined Standpipe
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 14 Class I Manual Combined Standpipe
If it's manual wet combined system then pumper truck provides the 750@ 100 psig reqd by NFPA 14,
The water supply has to support that flow from an exterior hydrant without dropping below 20 psig on any portion of the underground piping (adjusted for elevation).
The water supply has to supply the worst case sprinkler demand, plus the required exterior hose stream.
But it does not have to supply both the standpipe demand (nfpa14) and sprinkler demand (NFPA 13) at the same time.
Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
RE: NFPA 14 Class I Manual Combined Standpipe
My Question is, Is it the intent of 7.8.1 to require 100PSI at all outlets simultaneously, or just the one most remote..?
RE: NFPA 14 Class I Manual Combined Standpipe
Logic would dictate that if you can provide at least 100 psi at the most remote, you are providing more than that at the less remote outlets.
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
No wonder the calcs are not working, you are having to push that water though all the sprinkler system components.
These used to be used for storage, for workers to use to 'fight the fire', until it was finally admitted they did more harm than good by delaying the FD response.
I sketch scanned and added as an attachment would greatly benefit you at this point. People would be able to help point you in the right direction and get a full understanding of the situation.
Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
RE: NFPA 14 Class I Manual Combined Standpipe
*A* sketch scanned and added as an attachment.. would do you good.
Real world knowledge doesn't fall out of the sky on a parachute, but rather is gained in small increments during moments of panic or curiosity.
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 14 Class I Manual Combined Standpipe
If say your main pressure is 80psi. And you add 120 psi from the brt you will be at 200
RE: NFPA 14 Class I Manual Combined Standpipe
I understand that in a vertical standpipe due to elevation, 100psi is implied as available at all connections, but at "any and all connections" and at the same time?
I just have a hard time thinking that that's the intent.
Seems to me that the Water Allowance of 500/250 for additional standpipes/connections is more of the objective. From a Fire Fighting Standpoint, I would agree that if you had 2 or 3 standpipes and/or hose connections in the same area.. like a roof top or open Mall Structure, the 100PSI at each at the same time makes sense. But in a "horizontal" arrangement with connections in completely separated fire areas, with no common means of access to one another...?
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
RE: NFPA 14 Class I Manual Combined Standpipe
Good luck on it. Let us know what gets approved by all agencies involved. I find it pretty interesting how some of these things end up turning out.
Travis Mack
MFP Design, LLC
www.mfpdesign.com
RE: NFPA 14 Class I Manual Combined Standpipe
The fd is probably saying they have a 750 gpm pump
They will crank it to maybe max 150 psi
That does not take into account the city main pressure added to it
Not a FPE but if you calculate a remote area I take it is assumed the rest of the heads have the same needed pressure
Same as the other posts if you hit 100 psi at the remote you should have at least 100 at all connections before it
Fd sometimes depending on nozzle used , it needs around 100 psi for it to work correctly
RE: NFPA 14 Class I Manual Combined Standpipe