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Gas Purge and Testing

When an engineer works on gas pipe which is being cut into or removed from service, first of all, they must be ‘purged’. A purge is carried out in order to remove the hazardous gas from the line. This is done by injecting an inert gas into the pipe.  The inert gas mixes with the gas in the pipework. This stops the hazard of a combustible mixture which could cause harm to workers on the site.

After the purge has been carried out, an engineer opens an upstream valve which allows natural gas to enter.  A service valve on the line with a diffuser attached is then used to allow venting gas or nitrogen to escape from the pipe in a safe and controlled manner

After the pipe has been cleared of gases, further safety checks are carried out using our specialist testing equipment to ensure there are no gas pockets left in the pipework before the pipes can be cut into therefore allowing new branches to be connected, repairs carried out to the current pipe or for the pipe to be removed from service.

Purging is often linked to testing but not always. Purging is also undertaken during the commissioning stage. For example, purging is done on new pipework AFTER the pipework has successfully passed the tightness test. It needs to be safely purged following the procedures laid out in IGE/UP/1 (or1A). This is a critical procedure. It is imperative that an explosive mixture of gas and air is not left within the pipework

Trust in the experts.

Our team at Gas Pipeworks are fully trained, Gas Safe registered and have the skills to carry out a gas purge and test on commercial, industrial and plant gas lines while following all safety guidelines. Along with our parent company J & U services who are UK renowned industrial and mechanical gas engineers we can, therefore, supply the ‘one-stop-shop’ from repairs and maintenance to installs and decommissions.

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