3. Operators shall inspect flare stacks or other combustion devices every 15 days in accordance with Annex IV, except where they are not used on a regular basis. Where flare stacks or other combustion devices are not used on a regular basis, operators shall inspect them before each use.
As an alternative to regular inspections, subject to the approval of the competent authorities, operators may use remote or automated monitoring systems, as specified in accordance with points (1) and (2) of Annex IV.
Where irregularities are detected, operators shall investigate the cause of the irregularity and remedy it within 6 hours or, in the case of severe weather events or other extreme conditions, within 6 hours after the conditions return to normal.