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HOSE ALLOWANCE PRESSURE IN HYDRAULIC CALCULATIONS

Question asked by abdulrafay80 on Mar 15, 2020
Latest reply on Mar 18, 2020 by abdulrafay80

In hydraulic calculations (using software) we normally find the fire pump pressure requirement using farthest sprinkler as the reference point and than add hose stream allowance as per hazard requirement. I need some clarification mentioned below:

 

1) The final required pump pressure does not consider sprinkler + hose flow. For example if sprinkler requirement is

200 gpm and hose allowance is 100 gpm, the software will calculate pressure loss in the piping considering 200 gpm flow only. Is this the right way to calculate pressure loss? 

 

2) Is fire sprinkler system and hose connection are supposed to run simultaneously? 

 

Kindly provide reference from NFPA for the answer if any. 

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