bad water hammer and slow pressure bleed

Old 11-27-16, 08:02 AM
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Join Date: Oct 2004
Location: wisconsin
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bad water hammer and slow pressure bleed

tank and bladder are good; pressure set to 38 psi; well relay is 40/60. everything works fine, except loud multiple back and forth hammer when well pump shuts off at 60. then, there is a slow pressure drop from 60 to 56 1/2, and then it hold steady. drop takes about 5 minutes. is this normal?? the well is about 200 feet from house, with a 1 inch line to house.
Old 12-03-16, 11:12 AM
Join Date: Jan 2008
Location: Southeastern Pennsylvania
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hi reis Ė

This is a late response so I donít know whether you will see this or not. But I think check valve problems can cause water hammer. I think especially if there are multiple check valves that donít all close at the same time. Iíve read some posts (donít remember where) by some supposed experts, who swear they would never install multiple check valves, only the one at the pump.

This link also I believe indicates that a single check valve that closes too slowly can cause water hammer. Maybe you have a check valve down at the pump that is not completely closing.

Donít know if any of that would explain a slow pressure drop as you have that stops on its own, but maybe it could. Maybe if a check valve took a long time to close some of the water would go back into the well, dropping the pressure in the house (tank) somewhat Ė but then the check valve would fully close and the pressure would level off.

Although maybe a check valve closing that slowly over a period of time is impossible. Who knows Ė lol. But in any case maybe you could look into your check valve situation.

Good luck!

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