Hi all, I have a remodelling and home repair business. Recently my neighbor asked me to replace her dishwasher as there was some electrical involved and other stuff that made it too complicated for the store installer.
I left everything the same except for an added water shut off valve and a new circuit. I used a metal braided water line and everything seemed fine. The DW worked fine for the initial trial run.
The next day she called and said the pipes were shaking. I added a water hammer arrestor between the shutoff and the dishwaher. Everything was fine for a week of so, then she calls again and says the water hammer has returned, but this time it sounds like it is coming from the water heater.
The only things that we really changed were to add a new shut off valve for the dishwasher and fix the old leak. And of course we secured all the pipes.
I feel that this is just a coincidence, but I don’t know. The old dishwasher didn’t bang on the house. She won’t buy the story of ghosts.
thanks
john
Any ideas as to what is causing this?
Replies
Was air left in the plumbing, like did you shut off the main service for this project and not drain all of the other fixtures of air?
Air won't cause water hammer. In fact, it will help reduce it, acting as a primitive hammer arrester.
If your view never changes you're following the wrong leader
you said that you installed a new valve. My guess is that the old valve was restricting the water flow and the water was moving slower. Try partially closing the valve.
Quite often "water hammer" is really just pipes banging. Make sure all the pipes involved are tightly fastened, and make sure that none are running near something like a heating duct that they might bang against.