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When taking a gas pipeline offline or installing a new one, utility crews must first treat the confined space with inert gas, such as nitrogen, to limit the chances of combustion. After the pipeline has been treated, workers should test the space for the presence of hazardous gases. This is what’s known as purge testing. However, this is not the same as conventional gas detection. The pipeline will contain little oxygen and high concentrations of natural gas, which could damage the gas detect …