This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

fire flow analysis at max hour

Hello,

i'm doing the design of potable water and fire fighting network as combined network for a new site, 

we are studying two scenarios (MAx daily + fire) and (Max hourly). because it is too big site (7,000,000 m2) the peak design is the Max hourly flow.

i'm trying to study the fire flow analysis in the scenario of (Max daily + fire) and the hydraulic of the network (pressure and velocities) in the second scenario (Max hourly)

we are proposing three main DMA's, according to my previous study in water losses management we should add the entrance of each DMA with a PRV to sustain the pressure at minimum value for better leakage management. but when i used the PRV's it affected the fire flow analysis

do i follow the right methodology for such case?

note: according to the client requirements, we are assuming fire flow at each junction of the network

Regards 

Parents Reply Children
  • If you can't meet the needed fire flow, then you need to understand why. If it is due to excessive head loss, then you may need to upsize pipes. If it is due to excessive head loss in a control valve, then the valve may need to be upsize or its setting changed.

    I'm not sure what you mean by "run the fire flow analysis in different scenario than the max hourly scenario". In the US, fire flow is usually added to the max day demand. You would use the demands from the max day alternative as the starting point for the fire flow analysis.

    Answer Verified By: ahmed hassan