Tightness test
A pressure test that checks a gas installation for leaks, using a pressure gauge on the installation pipework.
Domestic tightness testing follows the industry procedure for the installation type, with stabilisation and test periods and limits on any allowed pressure drop.
It is carried out on new work, after work on the installation, and when a leak is suspected.
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A plain-language explanation, not a technical procedure or legal advice. Follow the current regulations, industry procedures and manufacturer’s instructions.