Gas Testing & Gas Purging
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Gas Purge Testing is a cornerstone of the safe installation, decommissioning, or
replacement of natural gas pipework or storage tanks. The purge is carried out to remove
natural gas, a highly combustible material, from the pipework to minimise the risk of fires or
explosions that can cause injuries or fatalities and damage to property.
Who can carry out gas purge testing?
The law stipulates that gas purge testing must always be carried out by appropriately trained
Gas Safe registered engineers. At UK Commercial Gas, we have a team of highly
experienced and registered engineers available seven days a week to carry out gas testing
at a time that is convenient to you.
Our engineers are equipped with the most up to date sensor technology, so you will have
peace of mind that the work is carried out to the highest possible standards of accuracy and
safety. We have an extensive track record of carrying out gas purge testing on commercial
gas networks in public and private sector buildings.
Why is purge testing necessary?
The process is necessary to ensure that the further stages of maintenance work, installation
or decommissioning can take place within a safe environment. This is not just to mitigate
against the risk of fire or explosions, but also to avoid the inhalation of toxic gases that could
cause respiratory problems, illness or even be fatal.
If the commercial gas system is to be decommissioned, a purge test will be performed
beforehand to ensure that the installations can be safely removed or capped. All
decommissioning projects should be carefully planned with a full risk assessment and an
emergency response plan should be put in place.
What does gas purging involve?
The purge test involves introducing an inert gas at a set pressure and flow rate into the
system, in order to decrease the concentration of hazardous gas. The gas engineer will use
specialist equipment to analyse the atmosphere and measure when the flammable natural
gas has reached a level that is low enough for it to mix safely with air.
There are two main methods of purging, usually referred to as direct purging and indirect
purging. Direct purging involves injecting an inert gas such as nitrogen directly into the
system to displace the natural gas.
Indirect purging involves injecting an inert gas into the system to reduce the concentration of
the hazardous gas. Once the gas has been tested and is at safe and acceptable levels, it is
discharged into the atmosphere. Both methods are a safe and effective way of managing
risk and ensuring that the system is safe for further work.
What is gas tightness testing?
Gas tightness testing is carried out on existing pipework to ensure that commercial gas
installations are in safe working order, efficient and in compliance with the Gas Safety
(Installation and Use) Regulations (1998). A key element of the test is to ensure that the gas
is flowing correctly and at the required pressure levels.
The tests must be carried out by a qualified Gas Safe engineer who is authorised to issue a
gas safety inspection certificate. This document will serve as proof that the business owner
is compliant with the regulations, and is usually required on an annual basis to validate
commercial building insurance policies.