Throughout most of Europe, pipelines are traditionally pressure tested using water. However, according to some experts, air pressure testing can be a more secure pressure testing method, reducing the risk of both Legionella and water damage, especially for large commercial new builds.
Don Elworthy is a Senior Contracts Manager at Panks Engineers Ltd in the UK. Panks engages in a wide range of projects from large commercial new builds to residential one-off remodels and repairs. They specialize in building hospitals and schools where hygiene and cleanliness reign supreme. When specifying pressure testing methods, Don always requires air-pressure testing during construction.
“We section off about 50 metres of pipe at a time and test as construction progresses,” Don explains. “We do it this way for two main reasons. Firstly, we can avoid frozen or burst pipes in winter. And secondly, but most importantly, because it eliminates the risk of Legionella bacteria in the pipes.”
Reducing the risk of Legionella
In the UK, Legionella is governed by seven water companies that require Legionella risk assessment reports for every new build in the country. Don takes full responsibility for these reports and Legionella is always top of mind. If pipes are not dried properly after water-pressure testing, Legionella bacteria can grow.
“When you pressure test with air, you can skip the time-consuming drying phase, but also be 100% assured that no Legionella bacteria have been introduced to the pipes during construction. This is particularly important in the hospitals and schools that we build.”
Some contractors and installers in the UK will assume the risk of a leak if it means they can save time on the construction process. That is not a risk that Don is willing to take.
“I insist we pressure-test religiously. Not only does this reduce our damage liability, but it’s also one of our most important selling points to new clients. They benefit from this extra level of security as they can be sure they will not experience a leak that can cause further damage to their asset.”