Which instruments should be provided for main fans?

The inclusion of pressure recording gauges or water gauges for main fans is critical because these instruments provide essential information about the performance and operational conditions of the ventilation system in an underground mine. Main fans are responsible for maintaining airflow, which is crucial for controlling the environment, preventing the accumulation of harmful gases, and ensuring a safe working atmosphere.

Pressure recording gauges can help in monitoring the static pressure in the ventilation system, allowing mine operators to determine if the fans are operating efficiently and effectively. By recording pressure, operators can identify any blockages or variations that might affect airflow, which can pose safety risks. These gauges also facilitate the detection of changes in airflow resistance, which can indicate the need for maintenance or adjustments.

Water gauges, on the other hand, can be utilized to measure the pressure differential created by the fan, which is indicative of the fan's ability to move air through the mine. Monitoring this pressure helps ensure that the system is functioning within designed parameters and can alert personnel to any deviations that might suggest mechanical issues.

Other instruments, while useful for monitoring different environmental factors, do not directly assess the operational effectiveness of the main fans in the same way that pressure gauges do. Thus, the focus on pressure recording gauges or water gauges is key for effective mine ventilation management