Like how a normal hammer sounds like when it starts banging on something, a water hammer sounds the same way.
A water hammer is not just a problem that requires immediate attention because of its consequences, but also the sound it makes it also relatively annoying and unsettling to have in your home.
When water pressure increases beyond the normal level, the pressure pushes water to directions against the normal flow. Water begins to bang against the pipe creating an eerie sound that is similar to a pounding noise.
Another potential cause of water hammer is when there is too much water in your air chamber. An air chamber helps regular pressure by preventing water from forming into waves in the pipe.
Air chambers are common in modern pipelines. However, if you are using pipes installed before the 20th century, it is likely that you do not have an air chamber.
The chances of having a water hammer due to pressure are then low; however, you can still get it from other factors such as deterioration of pipes.
Water Hammer from Household Fixtures and Appliances
Appliances and household fixtures can also cause water hammers. When the appliances connected to your water system are too strong, it can create strong pressure against your water line.
Such examples are washing machines, ice makers, sprinklers, water heaters, and dishwashers. Make sure that your appliances and fixtures are installed properly to decrease the chances of having a water hammer in your home.
source: here
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