Flow & Pressure requirement for Hydrant

[Adnan86]

Hi everyone, Can anyone help me know the flow & pressure requirement of hydrant. Any reference from IBC, IFC, NFPA would be great help.

 

[cdafd]

in what setting??

how much is needed for a building?

how much for a sprinkler system

how to do a flow test??

 

[Adnan86]

cdafd, The building needs 300gpm @ 5bar for sprinkler system. The available city water pressure on site is 2.5 bar.

 

[TravisMack]

try appendix B of the IFC

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[Adnan86]

The GPM I am getting from Appendix B of IFC is 3250gpm which I feel is too high. Also the pressure demand for Sprinkler (only for 1 building out of 7) is 5 bar. Selecting a pump for 3250gpm @ 5Bar will be okay?

 

[TravisMack]

Check for any allowances and reductions you may get from Appendix B. When a pump is supplying hydrants and sprinklers, typically the pump capacity is governed by the fire flow and pump pressure is governed by the sprinklers.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[stookeyfpe]

You asked about fire flow in an earlier post. Are you sizing the pump for fire flow or sprinkler demand?

Also, 300 GPM seems very, very low for a warehouse but maybe you are dealing with low heat release rate commodities.

 

[Adnan86]

TravisMack, There is no reduction possible in fire flow as almost all buildings except one are non sprinklered. Yes I have selected the pump with fire flow gpm and Sprinkler demand pressure. But one of the manufactures told me that 5 bar pressure is too low for hydrants, It has to be minimum 8 Bar. Thats the reason I am confused now.
Stokeyfpe, I am sizing the pump for both Fire flow & Sprinkler demand. 300 gpm is only sprinkler demand where as fire flow demand is 3250 gpm from IFC Appendix B.

 

[Adnan86]

IFC Appnedix B gives only the fireflow. Any Code reference of standard for the minimum pressure required by Hydrant would be great help. Thanks.

 

[cdafd]

It is not a good idea to go below 20 psi residual ????

 

[stookeyfpe]

Look at the definition of FIRE FLOW. It specifically requires the fire flow be calculated at a residual pressure of 20 PSIG (1.38 bar).

 

[TravisMack]

Yeah. The tables in Appendix B are flows at 20 psi. I agree with Stookey that 300 gpm seems very low for a warehouse, unless you are just doing Ordinary Hazard Grp II so that storage is 12' or less.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com