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8. Modifications
8.1 Modifications to thermal spray equipment should only be performed either by the manufacturer, or by a competent person with the approval of the manufacturer. They must not invalidate equipment certification e.g. HAC and safety integrity levels. Consideration should be given to ensure the continued correct operation of safety and emergency interlocks and any software programs associated with electrical safety. It is essential that they continue to function in an integrated and effective fashion.
8.2 Where reasonably practicable, older equipment should be upgraded to meet the current level of safety standards - to include gas detection, exhaust airflow monitoring, flame detection, robotic guarding, door switches, emergency stop circuits.
8.3 It is particularly important, for the oxy-fuel processes, to assess the effect of any proposed modifications or alterations on the hazardous area classification.