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Flow & Pressure requirement for Hydrant

Flow & Pressure requirement for Hydrant

Flow & Pressure requirement for Hydrant

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

RE: Flow & Pressure requirement for Hydrant

in what setting??

how much is needed for a building?

how much for a sprinkler system

how to do a flow test??

RE: Flow & Pressure requirement for Hydrant

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

RE: Flow & Pressure requirement for Hydrant

try appendix B of the IFC

Travis Mack
MFP Design, LLC
www.mfpdesign.com

RE: Flow & Pressure requirement for Hydrant

(OP)
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?

RE: Flow & Pressure requirement for Hydrant

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
www.mfpdesign.com

RE: Flow & Pressure requirement for Hydrant

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.

RE: Flow & Pressure requirement for Hydrant

(OP)
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.

RE: Flow & Pressure requirement for Hydrant

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

RE: Flow & Pressure requirement for Hydrant

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

RE: Flow & Pressure requirement for Hydrant

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).

RE: Flow & Pressure requirement for Hydrant

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
www.mfpdesign.com

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