Orifice plate on pump's discharge to allow continuous run 1

[MountHorn]

Currently, two centrifugal pumps in parallel run in lead and lag to move water from the tank to the water system. The discharge of the pump feeds a bladder tank that's supposed to keep the pressure constant and minimize the pump from turning on/off constantly. However, the bladder is busted again and we want to add a recycle line from the discharge of the pumps to the tank to allow for continuous pump run. How would adding an orifice plate on this recycle line effect the pump curve? Would it help with our problem?

 

[Valvecrazy]

Bladders in bladder style pressure tanks go bad from the bladder going up and down with each pump cycle, which is like bending a wire back and forth until it breaks. Bad tank bladders are a sign of too much pump cycling. Controlling the pumps with Constant Pressure Valves would be an easy fix regardless of how much the flow rate varies. In this way there is no recirculation.

 

[LittleInch]

Temperature and being stretched way beyond what they were designed for I will give you, but if they don't actually move at all there is no point in having them.

There may be some sort of hysteresis and max no of cycles. Constant pressure valves wouldn't solve the issue of lack of throughput though...

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[Valvecrazy]

As long as it is pumping cool water there is plenty of throughput in a constant pressure valve. Just doesn't work with hot water.

 

[LittleInch]

A pity mounthorn never got back to us....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.