Reducing pump outlet?

[hunter_46356]

Got a 2" pump that will be used to run an 1" spray bar on a highbanker. The pump is rated at about 70 gpm which should be more than I need. I've heard of guys reducing the outlet dia. at the pump. I was thinking of reducing at the 2" pump outlet to 1-1/2" and then into a 1-1/2" ball valve reduce to 1" on the outlet side. I'm guessing I will increase velocity which should allow the pump to be run at a slower rpm. Will I get the same results if I keep everything at 2" to the ball valve?

 

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[russau]

keep your outlet at 2 inchs all the way to your device.if you reduce its size very much you can run the possibility of popping a hose or blowing a fitting off if its not secured enough. plus youll eleiminate any line loss with the smaller hose/fittings.

 

[Astrobouncer]

Run a diversion valve and just pump off the extra water to use for something else like a cleanup device. My buddies 2 inch pump puts out enough water while hes dredging (with a 2 1/2) that I can run a highbanker off the extra water.

 

[Hoser John]

Pump rating are blue sky and bs with absolutely no backpressure and you'll need every drop ya got to run that hb box. Don't do nuttn' till the need is PROVEN and not hypothicated by contemplation---get out-get it on and get sum-John

 

[Jason in Enid]

Keep the hose 2" all the way to the box. You loose flow through friction-loss in the hose. The smaller the hose diameter the higher the friction loss (exponentially). Length of hose adds FL, so long runs of smaller hose means you lose a LOT of flow. HJ is correct, the manufacturer stated flow is with no hose. The stated pressure is with zero flow. You will never get those numbers flowing water in the real world.