Surge Protection

[workingweekends]

Hey guys,

Looking for some basic direction in selecting a valve. There seems to be a lot of options out there, not sure which one best suites my situation. I have a 250 gpm centrifugal pump conveying water from an open-surface tank up 200 feet to another open-surface tank. In the event of a power outage I imagine the water traveling downstream of the pump to decelerate immediately after the pump stops, creating low pressure directly downstream of the pump. I would then expect the water to slam back down immediately after.

Its not obvious to me what type of check valve or arrangement would work best for this. Any ideas? Thank you in advance.

 

[bimr]

There are a number of different products. The silent check should work adequately.

http://www.valmatic.com/silentcheck.html

 

[LittleInch]

The thing here is that "your situation" isn't properly defined here.

If your 200 ft elevation is almost literally vertical then yes, as soon as the pump dies then the outlet pressure/head of the pump, which is probably not much more than the vertical head, and flow will drop off very quickly and the back flow will be very fast and sudden. Then you need a NRV which closes gradually and the ones proposed by bimr will be good.

However if your second tank is several miles away, the majority of the head produced by the pump is actually to overcome friction and as the power dies, the flow drops off much more gradually and virtually any old NRV will do.

All depends on your system, the velocity you're flowing at and whether the head produced by the pump is mainly overcoming friction or hydrostatic head. You've not provided any of that info so can't really say much more.


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