Gas tightness testing: how a suspected leak is actually checked

Key points on gas tightness testing

• The test measures pressure held over a fixed period, not a single reading
• Any pressure drop confirms a leak exists in the tested section
• Bubble testing at joints locates a leak once one is confirmed
• Required after new pipework is installed or altered
• Forms part of the checks after a reported gas smell

Where gas tightness testing usually comes from

The engineer isolates the installation, applies a test pressure and watches a gauge for any drop over the required time. A stable reading confirms the pipework and fittings are sound; any drop means a leak exists somewhere in the tested section, and further work such as bubble testing at joints narrows down the exact location before any repair is carried out.

Where we deal with this

• Street (BA16) · 14 mi
• Bradford on Avon (BA15) · 9 mi
• Bear Flat (BA2) · 8 mi
• Glastonbury (BA6) · 13 mi

Questions we get asked

Is a gas tightness test always done during a service?

It is generally checked, though the depth of testing depends on whether there is any reason to suspect an issue with the pipework.

What happens if the test fails?

The gas supply to the affected section stays isolated until the leak is located and repaired, then the test is repeated to confirm the fix.