Re: [RE-wrenches] Water system with Grundfos SQFlex

[Jay via RE-wrenches]

Hi all Yes the pump won’t go backwards but it’s possible there could be some leakage through the helical coil.  But both check valves have to fail which is a low probability.  I’ve seen pipe broken due to someone closing a valve and not having a pressure relief valve. Not knowing what kind of pipe/fittings  are being used it could be corrosion has made a hole.  Not knowing the layout it might be possible to split the plumbing and see if the leakage is above or in the well.  Lots of fun possibilities  Jay On May 26, 2024, at 9:03 AM, Roy Butler via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:  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" https://offgridsolar1.com/ e-mail offgridso...@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@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. _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. 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