[RE-wrenches] Water system with Grundfos SQFlex

[Roy Butler]

Brad,

Windy might chime in at some point to back me up on this but I see no 
way for that pump to turn backwards.
Reverse flow is likely a leak at the pump, the down well piping or at 
the pitless adapter if there is one.

Roy....

Another old time solar and wind guy, hoping to be retired someday :-).

Roy Butler
Four Winds Renewable Energy, LLC
8902 Route 46, Arkport, NY 14807


Education is when you read the fine print; experience is what you get when you don’t.

“The less people know, the more stubbornly they know it.”

Although no trees were killed in the sending of this message,
a large number of electrons were terribly inconvenienced.

                 

On 5/26/2024 10:10 AM, Dave Angelini Offgrid Solar via RE-wrenches wrote:
> 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" 
> <http://members.sti.net/offgridsolar/>https://offgridsolar1.com/ 
> <https://offgridsolar1.com/><http://members.sti.net/offgridsolar/> 
> 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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