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Posted by Speedy Jim on May 28, 2007, 5:39 pm
gglave@softtracks.com wrote:
> Hi All,
>
> I've got a 60-year old house with a water hammer problem. The hammer
> is particularly noticeable with the cold water line and the two
> toilets (might be with the dishwasher hot water line too, but I
> haven't noticed this). The water pressure also seems high. I realize
> the long-term solution is to replace the pressure regulator, but due
> to its location this will be a nasty several-day project (previous
> owners finished the basement and drywalled over it).
>
> I'm wondering if I could address it in the meanwhile with some water
> hammer arresters? Can I just sweat them into some exposed copper lines
> I have? How many do I need to put in? Does one hot and one cold do it,
> or do I need to scatter them around? The house is plumbed with copper,
> but the way it's been done it's a hassle to get at the toilet
> plumbing.
>
> Some people have also suggested an expansion tank. Is that a solution?
> How do they work?
>
> Finally, I could also probably put in a couple of 5-foot air columns
> in the utility room. I realize they gradually fill with water, but
> maybe if I put a stop-cock on the bottom I could drain them from time
> to time?
>
> Thanks in advance - Any advice is appreciated.
>
> Cheers,
> Geoff Glave
> Vancouver, Canada
>
If the present regulator (PRV) is stuck open,
consider leaving it in place and simply adding a
second one where it is accessible.
You do need an expansion tank (thermal expansion)
after the PRV to control overpressure due to
water expansion in the water heater (assumes tank-type).
The exp tank *may* help. Try it.
Otherwise, your 5 foot columns are a good idea.
Jim
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