<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi all</div><div dir="ltr"><br></div><div dir="ltr">Yes the pump won’t go backwards but it’s possible there could be some leakage through the helical coil. </div><div dir="ltr"><br></div><div dir="ltr">But both check valves have to fail which is a low probability. </div><div dir="ltr"><br></div><div dir="ltr">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. </div><div dir="ltr"><br></div><div dir="ltr">Not knowing the layout it might be possible to split the plumbing and see if the leakage is above or in the well. </div><div dir="ltr"><br></div><div dir="ltr">Lots of fun possibilities </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On May 26, 2024, at 9:03 AM, Roy Butler via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<font size="2">Brad,<br>
<br>
Windy might chime in at some point to back me up on this but I see
no way for that pump to turn backwards.<br>
Reverse flow is likely a leak at the pump, the down well piping or
at the pitless adapter if there is one.<br>
<br>
Roy....<br>
<br>
Another old time solar and wind guy, hoping to be retired someday
:-).<br>
</font>
<pre class="moz-signature" cols="72">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.
</pre>
<div class="moz-cite-prefix">On 5/26/2024 10:10 AM, Dave Angelini
Offgrid Solar via RE-wrenches wrote:<br>
</div>
<blockquote type="cite" cite="mid:9d4ec5616ca4c9a037d42a367050f9e5@sti.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div id="signature">Hey Brad,</div>
<div> </div>
<div>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😉</div>
<div>Assume there is a CU200 controller and pump is in ground
still, must be with 100ft head, sorry</div>
<div>No high amps? It runs, How old? </div>
<div> </div>
<div>--Dave</div>
<div><br>
<pre> </pre>
<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" rel="noopener" moz-do-not-send="true"> </a><a style="color: blue; font-size: 11px; font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; font-weight: 400; background-color: #ffffff;" href="https://offgridsolar1.com/" rel="noopener noreferrer" moz-do-not-send="true"><span style="font-size: 12pt;">https://offgridsolar1.com/</span></a><a href="http://members.sti.net/offgridsolar/" rel="noopener" moz-do-not-send="true"> </a>
e-mail <a href="mailto:offgridsolar@sti.net" moz-do-not-send="true" class="moz-txt-link-freetext">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
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<p><br>
</p>
<p id="reply-intro">On 2024-05-26 4:26 am, Jay via RE-wrenches
wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">Hi Brad<br>
<br>
With 2 check valves leaking I’d look for a broken pipe or a
corroded fitting. <br>
<br>
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. <br>
<br>
Jay<br>
<br>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">On
May 25, 2024, at 7:41 PM, Bradley Bassett via RE-wrenches
<<a href="mailto:re-wrenches@lists.re-wrenches.org" moz-do-not-send="true" class="moz-txt-link-freetext">re-wrenches@lists.re-wrenches.org</a>>
wrote:<br>
<br>
<br>
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. <br>
<br>
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. <br>
<br>
Brad Bassett <br>
Old time solar guy who used to do solar pumping back in the
'80's and '90's. Mostly retired now.<br>
<br>
<br>
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