Fire Hydrant OFF ESFR GRID
Fire Hydrant OFF ESFR GRID
(OP)
I have a 6x4 gridded ESFR sprinkler system with 2" or 2 1/2" branch lines.
The GC decided not to run the underground main around the building to the hydrant.
he wants me to run the hydrant off the 4" floating main or the 6" feed main over to the incoming 6" underground that supplies the hydrant.
I have run independent bulk mains across buildings too feed wall hydrants before.
The system is feed with a 95 psi 1500 gpm pump. IF I add 250 gpm at the hydrant connection point on the grid, increase the lines to 2 1/2" the grid works. (ESFR 250 Hose demand)
The 250 gpm hose would be my normal total hose demand requirement. (50 gpm each hose drop 150 gpm outside hose)
QUESTION: Would the 250 gpm outside hose to the hydrant be correct.
The hydrant would then have Pump pressure.
The hydrant would be controlled by the system riser valve and the hydrant shut off.
Could the hydrant be considered hose allowance.
My other option is to run a separate main ahead of the pump to the underground (hydrant), have a separate main for the ESFR system.
The GC decided not to run the underground main around the building to the hydrant.
he wants me to run the hydrant off the 4" floating main or the 6" feed main over to the incoming 6" underground that supplies the hydrant.
I have run independent bulk mains across buildings too feed wall hydrants before.
The system is feed with a 95 psi 1500 gpm pump. IF I add 250 gpm at the hydrant connection point on the grid, increase the lines to 2 1/2" the grid works. (ESFR 250 Hose demand)
The 250 gpm hose would be my normal total hose demand requirement. (50 gpm each hose drop 150 gpm outside hose)
QUESTION: Would the 250 gpm outside hose to the hydrant be correct.
The hydrant would then have Pump pressure.
The hydrant would be controlled by the system riser valve and the hydrant shut off.
Could the hydrant be considered hose allowance.
My other option is to run a separate main ahead of the pump to the underground (hydrant), have a separate main for the ESFR system.





RE: Fire Hydrant OFF ESFR GRID
That has blessed this??
RE: Fire Hydrant OFF ESFR GRID
RE: Fire Hydrant OFF ESFR GRID
Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...
RE: Fire Hydrant OFF ESFR GRID
The building is 160,000 SQFT with four ESFR systems, the pump is located on the east side of the building with a hydrant off of the 8" lead-in, the other hydrants are on the far northwest and southwest side of the building (supplied by 6" UG, connected to ESFR system).
The underground feeding the hydrant is 6" and I'm feeding the UG with 6" main.
The developers must have worked out the hydrant location with AHJ, one on east side of the building off 8" Lead-in, one the northwest side and one on the southwest side of the build (precast building, hydrant located 60ft away, one and half time wall height).
PS Our state has only adopted the 2010 addition of NFPA.
RE: Fire Hydrant OFF ESFR GRID
RE: Fire Hydrant OFF ESFR GRID
RE: Fire Hydrant OFF ESFR GRID
Travis Mack
MFP Design, LLC
www.mfpdesign.com
"Follow" us at https://www.facebook.com/pages/MFP-Design-LLC/9221...