water hammer - why air in pipes?
Posted by Debbie Salierno on December 02, 1999 at 23:34:14:
I have water hammer and I am trying to understand it better. Thanks to those who have helped me already.
I have reviewed everything I can find on water hammer including the last two years of this wonderful site.

My 2 questions are:

if water hammer is caused by air trapped in the pipes, how does the air get there? I know when repairs are done, air will be in the pipes until it is expelled through a faucet valve or whatever. After that, shouldn't the system stay closed with no air getting in?

Could I have some problem which is causing air to get into the plumbing system?

I am working with the plumbing contractor who built my home. We have already added arrestors and a new pressure reducer valve. I still have water hammer.

We still need to check the for faulty washers.



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