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Water pump pressure loss ?

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On 1/15/2020 at 7:19 PM, Rookiescot said:

http://www.walrus.com.tw/en/pdfdownload/business/TPH-Q/TPH-Q-IM-EN01.pdf

 

Any help?

Remember though when it comes to pump pressures you have to allow for the head pressure coming from the source. 

Hi

 

Thanks for the link - Just downloaded and will study .... 

 

Yes .... Head pressure + pump pressure = Gauge pressure 

 

When I get back to Thailand again I will bring with me a pressure gauge ( 0 t0 10 bar)  Thanks Fruit Trader - Just what I wanted to do when in Thailand last time - but I ran out of time .. Valve was installed .. but could not lay my hand on the gauge. 

 

The pump will stop under two conditions - max pump pressure (whatever the pressure switch setting is or no flow  (i.e. flow sensor and pressure switch wires go into the motor control PCB)

 

Will post an update when I get to the bottom of this ..

 

 

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  • Possibly the check valve (non return valve) has become slightly worn and is passing. This allows pressure built up in the pump outlet to drain back slowly into the water source. You can test this

  • Running once an hour is nothing, that wouldn't even be noticed in my establishment! could be anything, even compression or heat expansion in lines etc. I would wait till it gets worse before inve

  • Andrew Dwyer
    Andrew Dwyer

    Yes, no NRV on the bypass ( only a ball valve ).   Did your check this morning Rookiescot and it did restart so am back to looking for any signs of a leak , although it is a very small leak

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