After CO2 has been dumped, how long must the module be purged before it is safe for entry without life support equipment?

The correct response indicates that after carbon dioxide (CO2) has been dumped, a purging period of 25 minutes is considered necessary to ensure safety for personnel entering the module without life support equipment. This timeframe is critical to allow any residual CO2 to be adequately displaced by ventilation or other means, thereby reducing the risk of asphyxiation or other health complications associated with elevated CO2 levels.

CO2, being heavier than air, can accumulate in lower areas of a confined space, posing a danger to anyone entering without proper protective measures. The 25-minute purging period is a standard safety protocol developed through practices in confined space entry and gas management to ensure a sufficiently safe environment before personnel re-enter.

This timeframe reflects an industry-standard recommendation, ensuring that the air quality has improved enough to mitigate the risks posed by any residual gas. It is essential to follow these guidelines stringently to adhere to safety regulations and protect individuals from potential airborne hazards in a gas turbine environment.