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Old 07-28-2012, 05:51 PM   #1
wingnut225
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Default Banging pipes when well pump kicks on

Hi,
I have a well pump and whenever the pump kicks on, the water supply line (PVC) in the basement that leads from outside to the tank will make a loud bang noise. This occurs at a 90 in the line. I thought it might be air in the line as if the foot valve at the well pump is bad but I don't get any air come out when I turn on the faucets. I have researched "water hammer" but that mostly refers to when a faucet is turned off. How do I remedy this? Most annoying plus I don't want my PVC water line break.

Thanks!
Chuck



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Old 07-28-2012, 08:11 PM   #2
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check valve?



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Old 07-29-2012, 12:52 PM   #3
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I have encountered this before (im a state certified florida master plumber of ten years) and the remedy is usually to place the bladder or hydro-pneumatic tank directly adjacent to the supply well pump with as little turns in the the pipe as possible. Doing this will give lots of expansion for in incoming rush of water wich exerts many pounds of force in the pipe fittings leading to failure.

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Old 07-29-2012, 06:05 PM   #4
speedbump
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What kind of pump do you have? A submersible or a jet?

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Old 07-29-2012, 08:25 PM   #5
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Remove any check valves above ground. The “foot valve” is the only check valve you need in the system. Then if as you suspect the foot valve is bad, the pressure will drop and the pump will start up even though you are not using any water in the house or yard. The above ground check valve is masking the problem at the moment, but it is also causing the water hammer on pump start. Replacing the foot valve is usually the only way to solve this problem.

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Old 07-30-2012, 12:58 PM   #6
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Quote:
I thought it might be air in the line as if the foot valve at the well pump is bad
This made me wonder just what the heck was going on, so I'm trying to figure out if you have a sub or a jet. Foot Valves are not at the pump. They are in the well. Some people think submersible pumps have Foot Valves.
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Old 10-25-2012, 09:02 AM   #7
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Default Banging pipes when well pump kicks on

We have a well, not public water. Several seconds when the regulator tells the well pump to kick on, our water pipes bang. What are the causes for this banging and how can it be stopped?

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Old 10-25-2012, 01:05 PM   #8
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Like mentioned above. Remove any above ground check valves.



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