Domestic demand vs. fire demand 1

[chaz12]

I have a college laboratory building with a combined fire/domestic water supply entering the building and then splitting.

Fire demand is governed by 2 standpipes at 750 gpm.
Sprinkler demand is O1 which ends up less than the standpipes.

Domestic demand for the building is also 750 gpm.

Does the sprinkler designer add the domestic demand to the fire demand, or can it be ignored? Would the combined demand be 1500 gpm or is 750 gpm sufficient?

I am a consulting engineer and my goal is only to size the combined service on the plans for bidding purposes.

Thanks for any responses.

Chaz

 

[cvg]

depends on how many people will be flushing toilets while the place burns... Size for the maximum of the two.

 

[SprinklerDesigner2]

Usually sprinkler designers don't include domestic water use in their calculations unless the building is designed per NFPA #13R where it is mandated.

In the event of a fire, with fireman coming up stairwells, alarms sounding off and sprinklers discharging I doubt anyone will stick around to finish their shower or continue an experiment.

Unless told otherwise I doubt a single sprinkler designer out here would include any sort of domestic demand for a building designed per NFPA #13. I wouldn't.

 

[chaz12]

Thanks for your responses, much appreciated.

Chaz