Plumbing Question

[banditpowdercoat]

Acctually, with a centrifugal pump, restricting the flow uses Less power. More water moved = more work, = more power consumed. Just went through this on Saturday with my Firehall and a practice burn. We were using a Gas Honda pump to pump water from the creek up to our porta-tanks. When waterflow was full open, tank of fuel lasted X long( cant remember acctual times) But when we put a gate valve on, and restricted the flow, the fuel lasted alot longer. Like 3/4 of the day to the 2nd tank. This was because the engine saw less load, and throttled back via the govenor.

Now, a Positive displacement pump, power consumed goes up when output is throttled back