Fire water demand and pressure
Fire water demand and pressure
(OP)
Can anyone help me estimate the fire water demand and pressure required for an office building. We need this info as preliminary interface data for utility requirement.
Any information is highly appreciated.
Thanks.
Any information is highly appreciated.
Thanks.





RE: Fire water demand and pressure
If you have a wood structure with slopes >=4:12, you could have a demand of 500+ gpm interior and 100 gpm hose allowance.
The pressures could be as low as 25 psi at the base of the riser for the wet system and around 50 psi at the base of the riser for the dry system. All of the pressures can be modified with pipe sizing.
So, as you can see, more information is needed to get what you want.
RE: Fire water demand and pressure
Please consider the building as a 3-storey, Security building with an armory section. Would the armory room would affect the water demand and pressure?
I have read from a fire pro reference that the maximum gpm for Ordinary hazard application based on Pipe schedul is 1500 gpm and the maximum pressure for fire pro sysytem is 95 psi. I just would like to hear some comments from experienced people on this.
Any info is appreciated.
Thanks.
RE: Fire water demand and pressure
Don't even consider pipe schedule stuff for you application. It is very likely that you would not be allowed anything with a pipe schedule and would require a calculated system.
Good luck!!
RE: Fire water demand and pressure
What would be the size of the main FW pipe for the above specs?
Thanks.
RE: Fire water demand and pressure
RE: Fire water demand and pressure