When is field welding or brazing for the repair of cylinders permitted?

Field welding or brazing on the repair of cylinders is prohibited due to significant safety concerns. The integrity of pressure vessels, like those used for storing compressed natural gas, is critical. Any welding or brazing can introduce stresses, create defects, or compromise the structural integrity of the cylinder.

The processes of welding and brazing can lead to changes in the material properties, potential gas leaks, and even catastrophic failures, especially under high-pressure conditions typical of CNG systems. Rigorous testing and stringent regulations govern the maintenance and repair of pressure vessels, emphasizing that such work should only be performed through methods that ensure safety and compliance with industry standards. Therefore, the prohibition on field repairs through these methods is a protective measure to ensure the safety of the equipment and personnel involved.