Fire fighting pump for hose reel systems
Fire fighting pump for hose reel systems
(OP)
hi,
The conditions are as follows:
-I just want to supply water for class I & III hose cabinets, there is not a sprinkler system.
-I calculate the required pressure by myself, only tell me the nominal flow capacity of the pump (gpm) and I guess a fire pump can supply up to 140% of its nominal capacity
-Condition: ordinary hazard group II
-Consider the pump is going to furnish 10 hose cabinets
I guess the required flow is 250 gpm, but I'm not sure, am I right?
Which pump do you recommend for this system?
The conditions are as follows:
-I just want to supply water for class I & III hose cabinets, there is not a sprinkler system.
-I calculate the required pressure by myself, only tell me the nominal flow capacity of the pump (gpm) and I guess a fire pump can supply up to 140% of its nominal capacity
-Condition: ordinary hazard group II
-Consider the pump is going to furnish 10 hose cabinets
I guess the required flow is 250 gpm, but I'm not sure, am I right?
Which pump do you recommend for this system?





RE: Fire fighting pump for hose reel systems
Your flow is wrong
RE: Fire fighting pump for hose reel systems
You will need 1,250 gpm and lacking sprinklers 100 psi will be required at the top outlet. Depending on the height of the standpipe you might not be able to use a 1,000 gpm pump if the building has any appreciable height. It may be possible to use a 1,000 gpm pump in a four story building but, again depending on the curve it might, not work in an eight or ten story building. In any event 1,000 gpm would be the smallest you could use.
You can also use any point on a pump curve out to 150%.
RE: Fire fighting pump for hose reel systems
The reason I thought 250gpm is enough was because of Table 11.2.3.1.1 in NFPA 13-2002, which states the total combined inside and outside hose (gpm) for a ordinary hazard is 250.
So, installing sprinkler system usually reduces the total required flow?
What if the building is partially protected by sprinklers, how does the required flow change? For example, consider in a building only garages
are protected by sprinklers but the office areas are unsprinklered.
RE: Fire fighting pump for hose reel systems
RE: Fire fighting pump for hose reel systems
Where fire department pumpers cannot supply the required system demand through a fire department connection, an auxiliary water supply consisting of high-level water storage with additional pumping equipment or other means acceptable to the AHJ shall be provided.