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Thread: Another Water Hammer Question

  1. #1

    Default Another Water Hammer Question

    I experience water hammer whenever I flush the toilets furthest from the main and sometimes whenever I shut off the shower furthest from the main. This is a new house, 1 year old.

    Some background: Watering lawn was difficult. Sprinklers attached to outside faucet barely rotated. Next door neighbor (home built at same time, same builder & plumber) has a sprinkler system and suggested adjusting the regulator (PVR???) to increase psi. Water pressure gauge shows neighbor’s psi is 80. I set mine to 80 as well. But my neighbor does not experience water hammer and I do.

    We did not have water hammer prior to adjusting PSI but did experience poor performance. We are very comfortable with and enjoy the current pressure. The lawn gets completely watered and the shower feels great. Only problem is the water hammer. What to do?!?!?
    Last edited by here4more; 08-09-2007 at 08:01 AM.

  2. #2
    Homeowner geniescience's Avatar
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    hammer noise and vibration has to be treated. Several ways to do that. Have you already searched on this? Do you know where the hammer arrestors are in your house? How many?

    David

  3. #3

    Default RE: Another Water Hammer Question

    Thanks David for replying. This IS a GREAT forum! It was from this forum that I was able to understand technically what the noise is. I have searched the forum and have found several very good posts. However, I do not know where my hammer arrestors are in the house or how many I have, if any.

    My questions: My house is on a 4 foot crawl space with all the plumbing under the house. Is this where my hammer arresters should be? Nothing in the house looks like the arrester pictures that I've seen.

    Should I just decrease the PSI to eliminate the water hammer and suffer with the lower water pressure? Really it wasn’t so bad – perhaps I can find a happy medium? Or, should I install hammer arrestors on the toilets and shower? But, by doing the later, is it possible that I may still cause damage to my plumbing although I may not hear the water hammer?

    Thanks Again.

  4. #4
    Licensed Grump GrumpyPlumber's Avatar
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    I'm going to have to guess the plumber never installed an expansion tank with the PRV.
    I had this EXACT same problem with a customer last month...simple expansion tank fixed it perfectly.
    "The biggest regrets we have in life are the chances we never took."

  5. #5
    Licensed Grump GrumpyPlumber's Avatar
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    Also....IF there's an expansion tank...it's not likely pressurized to match the systems 80 psi.
    "The biggest regrets we have in life are the chances we never took."

  6. #6

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    If you haven't figured it out by now, I'm a total plumbing n00b. I do know that i have what looks like a gallon container turn outside down sitting on top of my gas hot water heater. I believe it says potable expansion tank. Is this what your talking about? How do I pressurize it to match the 80psi?

  7. #7
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by here4more
    If you haven't figured it out by now, I'm a total plumbing n00b. I do know that i have what looks like a gallon container turn outside down sitting on top of my gas hot water heater. I believe it says potable expansion tank. Is this what your talking about? How do I pressurize it to match the 80psi?
    Thats it...get a tire guage...take off the small plastic cap on the bottom and check the pressure.
    IF it's less than 80...get a bike pump and eat yer wheaties.
    "The biggest regrets we have in life are the chances we never took."

  8. #8

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    Thanks! I'll try it and report back tomorrow!

  9. #9
    DIY Senior Member Mr_Pike's Avatar
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    Quote Originally Posted by GrumpyPlumber
    Thats it...get a tire guage...take off the small plastic cap on the bottom and check the pressure.
    IF it's less than 80...get a bike pump and eat yer wheaties.
    You should try borrowing or stealing an aircompressor first, Grumpy may be trying to kill you!

  10. #10
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by Mr_Pike
    You should try borrowing or stealing an aircompressor first, Grumpy may be trying to kill you!
    Dammit...DON'T ruin my fun!
    "The biggest regrets we have in life are the chances we never took."

  11. #11

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    LOL))))))

    Mr. Pike... I already figured out that I would use my aircompressor!

    Thank you all for your assistance!!! I'll let you know how it turns out.

  12. #12
    Commercial Plumber markts30's Avatar
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    I believe that before you pump it up, you have to release the pressure in the system...
    Turn off the water and open a faucet...
    Once that is done, close the faucet again and pump till you reach 75-80 psi...
    Then turn the water back on....

  13. #13
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by markts30
    I believe that before you pump it up, you have to release the pressure in the system...
    Turn off the water and open a faucet...
    Once that is done, close the faucet again and pump till you reach 75-80 psi...
    Then turn the water back on....
    lol...er...yea, that too...it'll read 80 psi if ya don't...oops.
    "The biggest regrets we have in life are the chances we never took."

  14. #14
    G.C. 22+ years(in 3 states) Old Dog's Avatar
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    Quote Originally Posted by GrumpyPlumber

    IF it's less than 80...get a bike pump and eat yer wheaties.
    80 with a bike pump?I'd get a couple of cans of spinach to go with them wheaties...lol

  15. #15
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by Old Dog
    80 with a bike pump?I'd get a couple of cans of spinach to go with them wheaties...lol
    Don't laugh...it's right in the instructions on the Amtrol/Diatrol tanks manual...bike tires inflate to an excess of 100 psi in some cases.
    Though I prefer to say I'm just a big tough guy....yeah...thats it.
    "The biggest regrets we have in life are the chances we never took."

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