When should pre-shift examinations of gas pipelines be conducted?

Pre-shift examinations of gas pipelines should be conducted when active workings are approaching within 500 feet of such pipelines. This is crucial for ensuring safety in areas where mining activities could potentially disturb or damage gas pipelines, as close proximity increases the risk of leaks or other hazardous situations. By performing pre-shift examinations in this context, it allows for the identification of any potential hazards, ensuring that appropriate precautions and monitoring are in place before work commences.

Other options, such as conducting examinations only when the weather changes or relying on a monthly schedule, do not provide adequate safeguards. Likewise, examining after every shift does not emphasize the importance of monitoring specifically when operations are near pipelines, which poses a greater risk. Thus, the significance of pre-shift examinations in relation to the proximity of active workings underscores the necessary precautions to maintain safety and prevent accidents.