[Shop-talk] Fwd: Re: Well water hammer?

[Peter J. Thomas]

On 8/26/2014 9:47 PM, Jim Franklin wrote:
> Resending to the actual list...
>
> On Aug 26, 2014, at 2:45 PM, Jim Franklin wrote:
>> Ok, the good news is, there was only 18 psi in there. The bad news is, it
> lost 22 psi over the past year. So while I regained the water pressure I
> hadn't really noticed was gone, it looks like this tank may be exiting it's
> mortal coil. It's a 2003 Welltrol 203, tall & skinny and a model reputed to
> have issues.
>> The tank also expelled a bunch of air upon emptying, probably because when I
> removed the inlet pipe, the broken, or lack of, a check valve at the pump
> allowed all the water to drain back. It doesn't seem like this was a factor in
> the water hammer though, because the hammer still there. Switch clicks, wait a
> 2 count, and bang and the gauge goes bouncy.
>> Unless you all have any more ideas, I'll let it run a few days and let any
> air still in the water side make its way out, see if anything changes. I
> really hope the pump isn't going...
>> jim

18 is low.  Should be 38 PSI.   This is the reason for the hammer. Pumps 
run at much higher pressure ( around 100 psi IIRC).  Its quicking 
compressing the air.  So you have less than half the air in there you 
should have.  So when the pump brings it up to 42 PSI it quickly 
compresses the smaller volume of air causing hammering.  You might try 
tightening the Schrader value or replacing since they are cheap.  Turn 
off the pump, empty the water, replace the value, precharge to 38 PSI 
and wait with the drain open to see if it holds.  If it doesn't hold 
with a new Schrader value, the diaphragm/bladder is damaged and the tank 
toast.  If it holds you should be good to go.

My Welltrol slowly lost pressure out the Schrader but in my case the 
pressure relief dumped water on the basement floor.   The cycling wore 
out the spring and I had to replace the pressure value.




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