Preventing a Water Hammer

 

Have you ever heard a loud banging noise coming from the pipes after turning off a tap? This is water hammer, a common plumbing problem that can be more than just a nuisance: it can potentially damage your plumbing system.

What causes water hammer

Water hammer occurs when a water valve is suddenly closed, causing a shock wave that knocks pipes against walls or each other. This can happen in washing machines, dishwashers, bathrooms and sinks.

Is water hammer just a residential plumbing problem?

It can occur in any plumbing system, including commercial and industrial buildings. Large installations, such as factories, municipal waterworks and power plants, are also susceptible to water hammer. In these contexts, the potential for damage can be significant and requires specialised water hammer mitigation strategies.

Are some dwellings more prone to water hammer?

Some homes are more prone to water hammer, particularly older homes with outdated plumbing systems that may not include modern water hammer prevention devices such as airlocks or drains. Homes with high water pressure are also more susceptible, as higher pressure can lead to stronger water hammer impacts. However, it is important to note that water hammer can occur in any house, regardless of age or design.

Can it cause damage to the plumbing system?

Yes. The sudden pressure surges that are created can strain pipes, causing loose joints, leaks or even ruptures. This is of particular concern for older or weaker pipe systems. Repeated water hammering can also damage appliances connected to the plumbing system, such as washing machines and dishwashers, stressing their internal components.

Do I have a water hammer problem?

The most common sign of water hammer is a loud banging noise coming from the plumbing. This noise usually occurs immediately after turning off a tap or when an appliance that uses water stops its cycle. The sound is similar to that of a hammer and can be distinguished from normal water flow noises. In addition, one can notice vibrations in the pipes or see them visibly shake due to the increased pressure.

How does high water pressure contribute to water hammer?

High water pressure can aggravate water hammer because it increases the speed of the water flowing through the pipes. When a valve is suddenly closed, the momentum of fast-moving water creates a stronger and higher pressure wave. This increase in pressure can cause louder noises and increase the risk of damage to the plumbing system. 

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