Water Hammering

How to get rid of water hammer noise or water arrester

“Water hammering” typically manifests as a loud bang heard after turning off a faucet, a phenomenon often mistaken for the sound of unsupported pipes, whether in new or older homes.

The primary way to distinguish between water hammering and the noise from unsupported pipes is by paying attention to the nature and timing of the sounds. Water hammering usually results in a single, loud “bang,” whereas an unsupported water line tends to produce a series of rapid, short, sharp noises. Interestingly, repeated instances of water hammering can also lead to a water pipe becoming unsupported, as the consistent jarring from the hammering can gradually dislodge the pipe from its supports. This interaction between the two issues underlines the importance of correctly diagnosing and addressing the underlying cause to prevent further plumbing complications.

Water Arrestor – Definition

A water arrestor, or a water hammer arrestor, is a device installed by plumbers to control the phenomenon of water hammer in your plumbing system. It typically resembles a copper vertical tube with an inlet and outlet, and it’s integrated into your water supply line.

The function of a water arrestor centers around maintaining air in the chamber of this vertical tube. When the flow of water in the waterline is abruptly halted by a closing valve, the air in the arrestor’s chamber acts as a buffer. This cushion of air compressively absorbs the sudden water flow, enabling a gradual decrease in the force within the waterline. This process effectively mitigates the sharp, loud bangs of water hammer, protecting your plumbing system from the associated stress and potential damage.

Water Arrestor – Repair

If you have a water arrestor already attached to your water line and you are still experiencing water hammering, it is possible that the arrester may be blocked. If that is the case, then turn off the valve located nearest to the arrester and open the fixture to alleviate the water pressure in the line. The fixture will drain whatever remaining water is trapped within. Once the water has been drained the arrester will once again fill with air.

If there are no shut-off valves located on the fixture, then close your main valve and follow the same instructions.

The major issue with water hammering is not just the sound, but it is the damage it may cause in the long run. The constant strain upon the water lines could bring about the possibility of a burst pipe or fitting.

A City of Toronto licensed plumber, such as Anta Plumbing has the experience and plumbing know-how to install and repair water arrestors to stop the sound of water hammering and the damage it does to your fittings and pipes. Call us today to book an appointment.