Parallel Pump System Manifold Design Help 1

[cuels]

I am designing a pump station for a culinary water distribution system. I have two pump skids. The first is a 45 gpm pump (demands & pressure) and the second is a 1500 gpm pump (fire flows).

I am looking for any guidance or rules of thumb for sizing a suction and discharge manifold to connect these pumps in parallel.

 

[CrazyHorse81]

You want the suction header no smaller than the discharge piping, it may be bigger to reduce pressure loss. 5 feet per second max is a good start. Then just reduce down from the header to each pump.

You might want to place the fire pump first and the domestic pump downstream of the fire pump since it will be running 99 percent of the time it will keep the water in the header pipe fresh.

What about redundancy of the domestic pump?

 

[CrazyHorse81]

Disharge header usually no greater than 10 feet per second. I treat it like the distribution system. Or equal to the suction header. You make the call.

 

[cuels]

Thanks!

I do have a redundant domestic pump on the skid, I just didn't mention it.

 

[CrazyHorse81]

So now to keep the water in the discharge fresh you can place the pumps in this order: domestic - fire - domestic. Right down the line...

 

[bimr]

What is a "culinary water distribution system" and how does fire flow enter into it.

Suction piping is generally 4-6 feet per second and discharge piping is generally 6-8 feet per second. Minimize the length of the suction piping. Use an eccentric reducer on the suction side.

 

[cuels]

Did I misname the system? Maybe the proper term is Public Water System...? Please correct me if I am wrong. Sometimes I don't always pick up on the right jargon.

 

[bimr]

Thanks for the clarification. Regarding "culinary", that is an adjective of or relating to a kitchen or to cookery.