Hello, Am new in the sprinkler s

[angie]

Hello,

Am new in the sprinkler system/ hydrant design. am suppose to design a 6 hydrant system with a pump connected to a water supply.
Could you please help me with the type of pump to use,
the pump pressure calculation, the pump gpm and also the pump head.

Thanks

 

[DieterVk]

First you have to determine the most demanding scenario. For example 2 hydrants working simultaneously. This demands (for example) 2x 1000 lpm at 3 bar. Then your pump according to NFPA has to be:

625 GPM
The working pressure depends on the length, diameter and friction of your pipe. If you expect (and you should calculate this) a pressure drop of 1 bar from pump to the hydrant, your pump should work at at least 4 bar.

 

[Adam Hollebakken]

Also you need to specify the type of water supply.

If there is positive pressure at the fire pump suction
you will normally use a centrifugal pump, either:
- horizontal split case
or
-vertical inline.

If you are lifting water from a pit or a pond you will need a turbine pump.

 

[angie]

Thanks guys. The water pressure is 2bar and running through a pipe of pn10.the Clients want 6 hydrant at a distance of 200m each. How can i calculate the type of pump to use and the pressure most importantly. Thanks

 

[DieterVk]

Do you mean that the demanded water pressure at the hydrant is 2 bar?
What kind of hydrant? What is the demanded flow?
What is the pipe size?
What is the pipe material (for estimating the pressure loss due friction)?

 

[angie]

The static pressure is 2bar. And its a wet barrel hydrant. The pipe size is a 4" hdpe pipe. PN 10 HDPE pipe. the water supply has a pressure of 2 bar and its the main waterline which the pump would be connected to.