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Construction welders regularly need to enter confined spaces in boilers, tanks, or pressure vessels to perform repairs or during the manufacturing process. Both MIG welding and TIG welding use inert gas that's heavier than air and that has the potential to displace oxygen and create a major hazard for the welder. Because of the inadequate ventilation of confined spaces, the heavy gas has the potential to literally submerge a worker. And because it's colorless and tasteless, it's easy to mis …

Typically gases such as nitrogen or carbon dioxide are used to remove oxygen from a confined space and render it inert. Often an area is made inert in order to remove the potential for fire, or to stop oxidation of a product within a space and keep it from spoiling.  If you are attempting a rescue, or have other need of entry, you must be able to anticipate what changes may result within the space if you return an oxygenated, breathable atmosphere to the area. To do this, you must …