🔶 Airflow Quantity Requirements for Underground Mines for Design Purposes – still the most experienced based/empirical feature of ventilation planning. 🔶 Some guidelines of first estimates without complete data 🔶 Strata Gas - provide enough airflow to dilute the concentration of the emitted gases to one half of the concentration at which the law requires both in terms of average threshold limit values over one shift and the short-term exposure limits. 🔶 Diesel Equipment ➖ 6 to 8 cubic meters of airflow per 100 kW of all diesel equipment - OR ➖150 cubic feet per minute (CFM) per horse power of all diesel equipment 🔶 Velocity Limits ➖ Working faces – 4 meters per second ➖ Main Haulage – 6 meters per second ➖ Hoisting Shaft – 10 meters per second 🔶 Selection of Multiple Variable Pitch Axial Flow Fans ➖ Select a combination of multiple fans that will meet the pressure-volume requirements with the combined operating point within the higher range of fans’ efficiency Thanks to SRK Consulting for making this valuable resource publically available. Source: https://www.srk.com/en/products/ventilation-textbook Hooman Askari, LinkedIn