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Thread: Water hammer arrestor leak

  1. #1
    DIY Junior Member ktvaughan's Avatar
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    Default Water hammer arrestor leak

    I have a water hammer arrestor PVC column that is leaking (cracked PVC pipe).
    It has an elbow off the main water inlet with a nut that threads into the elbow.
    Can I unthread that nut and replace the column or would it all be glued together?
    What is the current recommendation for replacing this (it's a simple 18 inch long piece of 3 inch PVC pipe capped at the top)?

  2. #2
    Porky Cutter,MGWC Porky's Avatar
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    It should all be glued together! I don't know why it's even on the system if you have a pressure tank? Replace it with new and you should be OK.
    Porky Cutter, MGWC
    (Master Ground Water Consultant)

  3. #3
    Moderator valveman's Avatar
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    Must be pretty bad water hammer if it cracked the arrestor. Need to find out what is causing the water hammer and fix that. Water hammer is the symptom, you need to find and prevent the disease.

  4. #4
    DIY Junior Member ktvaughan's Avatar
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    I replaced the PVC air column but the system stills hammers when the well pump shuts off. Pressure, cycling and pump seem to be working normally. It just hammers when the pumps shuts off at the end of a pump cycle. What would this a symptom of? Maybe my air column is too tall (I added 18 inches to be safe).

  5. #5
    DIY Junior Member ktvaughan's Avatar
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    I immobilized the air column with a 2x4 and it seems better. Maybe the air column was vibrating when the pump cycled.

  6. #6
    Moderator valveman's Avatar
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    You probably have a check valve with the spring broken or the check valve is dragging. When the pump shuts off, the spring is supposed to close the check before the water direction reverses. If the spring is broken, the check only closes after the water reverses which causes a water hammer.

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