[RE-wrenches] Water system with Grundfos SQFlex

[Dave Angelini Offgrid Solar]

Hey Brad,

Sometimes shooting is best if you tell more on what you have done so far 
like using the SQF shooting guide, especially on a holiday weekend😉
Assume there is a CU200 controller and pump is in ground still, must be 
with 100ft head, sorry
No high amps? It runs, How old?

--Dave

Dave Angelini Offgrid Solar
"we go where powerlines don't"
    [1]https://offgridsolar1.com/ [2]  [1]
e-mail  offgridsolar at sti.net
text 209 813 0060

On 2024-05-26 4:26 am, Jay via RE-wrenches wrote:

> Hi Brad
> 
> With 2 check valves leaking I'd look for a broken pipe or a corroded 
> fitting.
> 
> If there is anyway to isolate between the 2 check valves then you could 
> measure the pressure drop on both sides which should point to the 
> direction of the leak.
> 
> Jay
> 
>> On May 25, 2024, at 7:41 PM, Bradley Bassett via RE-wrenches 
>> <re-wrenches at lists.re-wrenches.org> wrote:
>> 
>> I have a water system with a Grundfos SQFlex SQF3-2 pump. I'm getting 
>> water flow in reverse either through the pump or a leak up to the 
>> pump. My question is if the check valve on the top of the pump is not 
>> sealing, will the progressive cavity pump allow water to flow through 
>> the pump in reverse? I'd think that with a positive displacement pump 
>> it would not, except very slowly or if it turned the motor backwards 
>> which I think would be very unlikely. There is about 100 psi head on  
>> the pump.
>> 
>> I think it's most likely I have a leak somewhere in the plumbing, and 
>> of course another failed check valve farther up in the plumbing. It's 
>> possible to get failures even with redundant protection if you have 
>> two concurrent failures, which I must have here.
>> 
>> Brad Bassett
>> Old time solar guy who used to do solar pumping back in the '80's and 
>> '90's. Mostly retired now.
>> 
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