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Posted by Harry K on February 6, 2008, 12:44 am
wrote:
>
>
> > Air leaked out of tank: bad fill valve. OR Leak in bladder: water filled=
> > the air half of the tank behind the bladder.
>
> So how does one test for this? =A0The tank, when the pump has cycled to it=
's
> normal 60 lbs high point, has 36 lbs of pressure at the air valve. =A0I've=
> read a little about this and apparently it should read 4 lbs less than the=
> low kick in win no water. =A0Does the 36 lbs translate to anything non dra=
ined
> and fully preasurized?
You are checking your pre-charge at the wrong time. Correct is to
totally drain the tank, and set the pre-charge to 2 psi below the cut
in
pressure. Then turn pump back on.
I find it more than passing strange that the guage is reading 60 psi
but checking at the air valve only shows 36 psi. There is something
more than odd there, I would have said impossible prior to your post.
There should be no difference between the guage and air valve...well,
other than instrument vagaries.
Cause of pump short cycling can, in almost all cases, be traced to the
pre-charge (incorrect), a malfunctioning pressure switch (not all that
common), a water logged tank caused by a blown bladder or diaphragm.
If it is the bladder or diaphragm, I believe it was dpb who gave a
possible short-term fix for it but tank replacement is the proper
cure.
Harry K
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Posted by Paul Franklin on February 6, 2008, 6:30 am
On Tue, 5 Feb 2008 22:22:00 -0500, "Eric Scantlebury"
>
>> Air leaked out of tank: bad fill valve. OR Leak in bladder: water filled
>> the air half of the tank behind the bladder.
>
>So how does one test for this? The tank, when the pump has cycled to it's
>normal 60 lbs high point, has 36 lbs of pressure at the air valve. I've
>read a little about this and apparently it should read 4 lbs less than the
>low kick in win no water. Does the 36 lbs translate to anything non drained
>and fully preasurized?
>
You said in your original post that when you run water after the pump
has cycled the pressure drops like a stone to 40 lbs. This isn't
right, the pressure should drop gradually as you run water; that's
what the tank is for. This combined with your measurement above makes
me think your tank has lost its air charge, or most of it. If the
bladder had failed, you probably would have had water leak out the air
valve when you checked the pressure. But if you just put a gauge on
there you might not have noticed. take the cap off the valve, and
depress the stem with a small screwdriver and see if any water comes
out at all. If so, replace the tank. If not, try draining the tank
and with the water drain valve still open, recharge the tank to 2lbs
less than cut-in pressure. If this works, great, but it probably
won't last, since whatever caused the air to leak out will probably
happen again.
Another (remote) possibility is that you've got sediment and debris
totally blocking the tank inlet so that it is effectively out of the
picture. If you don't see the air pressure change while the pump is
cycling on and off, I would suspect this as the cause.
HTH,
Paul F.
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Posted by David L. Martel on February 6, 2008, 7:52 am
Eric,
The bladder will slowly "leak" air even when everything is fine. Haven't
you noticed that tires and balloons go flat after a while? Get an air gauge
and check the bladder. With the tank empty of water the air pressure should
be a few psi below the cut-on pressure
Dave M.
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Posted by =?ISO-8859-1?Q?=22Blattus_Slaf on February 6, 2008, 11:30 am
David L. Martel wrote:
> Eric,
>
>
> The bladder will slowly "leak" air even when everything is fine. Haven't
> you noticed that tires and balloons go flat after a while? Get an air gauge
> and check the bladder. With the tank empty of water the air pressure should
> be a few psi below the cut-on pressure
>
> Dave M.
>
>
I've seen tires still up on vehicles in the woods for 20 to 40 years.
Air should not leak unless there IS a leak.
--
Blattus Slafaly ? 3 :) 7/8
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Posted by Stormin Mormon on February 6, 2008, 2:19 pm
Would it make too much sense, for those expansion tanks to have a valve stem
on top of the tank? When your tank is waterlogged, get your air compressor,
and pump some air into the top of the tank.
--
Christopher A. Young
Learn more about Jesus
www.lds.org
.
> resistance (there is no valve placed there) and 4 - a waterlogged water
> tank.
>
> TIA
>
You already have the most likely cause: #4 - waterlogged tank.
Don Young
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