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Posted by jim on May 11, 2007, 10:24 pm
On May 11, 8:49 pm, business...@nomail.com wrote:
> On 10 May 2007 20:06:43 -0700, 020...@gmail.com wrote:
>
> >wrote:
> >> You need to charge the tank with the pump off and a faucet open. Sounds
> >> like you're water logged.
>
> >Pressure tank is charged to 38 Lbs, and not heavy - so assume not
> >water logged. That's why I was suspecting a leak.
>
> It's easy to detect a leak. Shut off everything in the house.
> Preferably shut off the main valve in the house (if there is one).
>
> Pump up to full pressure, then watch the pressure gauge. If it slowly
> drops, you got a small leak. If it drops quickly, you got a big leak.
>
> I also think you are waterlogged. Empty the tank completely and drain
> the lines. NOW check the tank air pressure. Close all drain valves
> and restart the pump.
The pressure in the bladder should be 2lbs less than what ever you
want the pump to turn on at. Check the air valve if you have water
replace the tank
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Posted by Meat Plow on May 10, 2007, 11:43 pm
On Thu, 10 May 2007 19:44:21 -0700, 020SHC wrote:
> I pull water from a lake and pump it up to my cottage. For some
> reason, my pump has started short cycling. I changed the pressure
> switch, and the pressure tank is fully charged (about 38 lbs). It is
> primed. If I open the prime port and turn the pump in it shoots water
> high into the air - getting water is not the problem.
>
> When the pump comes on, it quickly builds pressure to 40 lbs and then
> shuts off, pressure immediatley drops to 20, pump comes on, then off
> very rapidly. Would a leak in the line between the jet pump and the
> house cause this? I am thinking it might have frozen and split....
Does the tank have a bladder?
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Posted by Bob F on May 11, 2007, 1:01 am
>I pull water from a lake and pump it up to my cottage. For some
> reason, my pump has started short cycling. I changed the pressure
> switch, and the pressure tank is fully charged (about 38 lbs). It is
> primed. If I open the prime port and turn the pump in it shoots water
> high into the air - getting water is not the problem.
>
> When the pump comes on, it quickly builds pressure to 40 lbs and then
> shuts off, pressure immediatley drops to 20, pump comes on, then off
> very rapidly. Would a leak in the line between the jet pump and the
> house cause this? I am thinking it might have frozen and split....
>
Between the pump and the house or between the pump and the foot valve.
Or the foot valve (if any) could be bad.
Bob
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Posted by Paul Franklin on May 11, 2007, 6:26 am
On 10 May 2007 19:44:21 -0700, 020SHC@gmail.com wrote:
>I pull water from a lake and pump it up to my cottage. For some
>reason, my pump has started short cycling. I changed the pressure
>switch, and the pressure tank is fully charged (about 38 lbs). It is
>primed. If I open the prime port and turn the pump in it shoots water
>high into the air - getting water is not the problem.
>
>When the pump comes on, it quickly builds pressure to 40 lbs and then
>shuts off, pressure immediatley drops to 20, pump comes on, then off
>very rapidly. Would a leak in the line between the jet pump and the
>house cause this? I am thinking it might have frozen and split....
First, your pressure tank should be charged to 2 lbs less than the cut
*in* pressure. So if your pump comes on at 20, the tank should be
charged to 18 when completely empty of water. If your cut-in pressure
is 40, then you're ok, but you said the pump stops at 40, so that
doesn't sound right.
Try disconnecting the line to the house and blocking the end from the
tank. (You should have a valve here anyway...) If it builds and holds
pressure, you have a leak in the line to the house.
If it still cycles, you have a leak on the source side, or a bad foot
valve or check valve.
HTH,
Paul
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Posted by Harry K on May 11, 2007, 10:28 am
On May 10, 7:44 pm, 020...@gmail.com wrote:
> I pull water from a lake and pump it up to my cottage. For some
> reason, my pump has started short cycling. I changed the pressure
> switch, and the pressure tank is fully charged (about 38 lbs). It is
> primed. If I open the prime port and turn the pump in it shoots water
> high into the air - getting water is not the problem.
>
> When the pump comes on, it quickly builds pressure to 40 lbs and then
> shuts off, pressure immediatley drops to 20, pump comes on, then off
> very rapidly. Would a leak in the line between the jet pump and the
> house cause this? I am thinking it might have frozen and split....
Others have covered all the points so I will just wrap it all up in
one:
1. Your pre-charge tank pressure is too high. Drain tank and re-
charge to 20 psi. If the problem stillpersists:
2. Leak? Quit possible, in the input line or a footvalve or check
valve. You can install a new checkvalve just prior to the tank. It
will work just fine.
I have assumed (I know, I know) that the pressure tank is in the
cottage. If it is co-located with the pump then the leak could be on
the house side and in that case you will have to find and fix it.
Harry K
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