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really I cant express my grateful to you, you helped me so much, thank you my teacher [heart]

nice now would you mind if you tell me, why the codes showing the no flow & shut off pressure are at 140% of the pump pressure , not 20%? do i missing some thing?

one more question please, how did you calculate the 5.5 bar at no flow case?

now that's is so logically . really that's great you helped me so much thank you sir.

my friend why you add head (So then add on the head gain due to gravity and then you get 55m (5.5 bar) at the highest hydrant and 70m (7 bar) at the lowest hydrant.) i thinked that i must subtract the head value becuse the pump is over the top roof and the gravity help it to reduce the pressure...

thnk u my friend it is very helpfull 1- the fire water tank is on the top floor. 2- Distance to the lowest hydrant is 16.5m. 3- why ==> (a differential head of about 43). 4- (so prob about 5.5 bar at the highest hydrant and 7.1 bar at the lowest hydrant) what about the gravity? grateful.

THNAK U VERY MUCH I ATTACHED A (PDF) FILE SHOWING THE PLAN, the cross section for the buildinghttps://files.engineering.com/getfile.aspx?folder=26ccef48-8d19-4984-aa5e-b35cf45443ca&file=HJI_REFAAT.Finsh2_Model_(1).pdf

I HAVE A WATER TANK OVER THE BUILDING FOR FIRE READY TO WORK SO THERE ARE NO DIFFERENT IN PUMP PRESSURE AND PIPE SIZE IN BOTH CASE?

thank u for your respondes the tank and the fire pump must be at the top roof , there is no space at the basement. the fire stand pipe class 2 with 6 floors cabins are needeed , 100 gpm and at lest 4.6 bar for pressure, 1.5" end hose , now what the diffrent in calculation if the tank and pump...

hi all plz how could i calculate the head and pressure of fire pump if its location ware at the top of the building? th u all

hi all can any one help me to showing the different in stand pipe, and pumps calculation between putting fire pump over buildings and the usual way by putting it at the ground? thx