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Fire flow analysis

Dear All, 

After  a long gap,  i am coming again to the forum. Now, my issue is with fire flow analysis. 

The fire flow guidelines given by NFPA  for my project (residential area) criteria is 1000 GPM flow for minimum of 2 hours. and it is to be operated with  two fire hydrants. ie to hydrants to be run in parallell with 32 GPM each. Now, how to simulate this scenario in the watergems model fire flow analysis.

kindly help me out. Since, now i am feeding the values in  each node and checking for fire flow.

Further, i am using watergems V8i version.

With Regards,

Sreepathy

Parents
  • There are really two steps to determining the available fire flow. First, you determine how much water you can deliver to the area and then you check if there are sufficient hydrants to get the water out of the pipes.

    What WaterGEMS/CAD calculates is the amount of water that can be delivered to the area. Then you need to check whether there are enough hydrants. For example, you may be able to bring 50,000 gpm to the intersection of two 48 in. pipes, but if there are no hydrants there, the available fire flow many be zero.

    For the type of hydrants we have in the US, according to the Insurance Service Office Fire Suppression Rating Schedule, you can credit 1000 gpm for every hydrant within 300 ft of the location, 670 gpm for hydrants 201 to 600 ft and 250 gpm for every hydrant between 601 and 1000 ft.

    I’m not sure about what kind of hydrants you have in the area where you work.

    The flow you mention of 32 gpm seems very low. Do you mean 32 L/s (about 500 gpm)?

Reply
  • There are really two steps to determining the available fire flow. First, you determine how much water you can deliver to the area and then you check if there are sufficient hydrants to get the water out of the pipes.

    What WaterGEMS/CAD calculates is the amount of water that can be delivered to the area. Then you need to check whether there are enough hydrants. For example, you may be able to bring 50,000 gpm to the intersection of two 48 in. pipes, but if there are no hydrants there, the available fire flow many be zero.

    For the type of hydrants we have in the US, according to the Insurance Service Office Fire Suppression Rating Schedule, you can credit 1000 gpm for every hydrant within 300 ft of the location, 670 gpm for hydrants 201 to 600 ft and 250 gpm for every hydrant between 601 and 1000 ft.

    I’m not sure about what kind of hydrants you have in the area where you work.

    The flow you mention of 32 gpm seems very low. Do you mean 32 L/s (about 500 gpm)?

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