Surface Environment, Mine Ventilation and Underground Hazards · Underground Hazards · 2 marks · Numerical answer
A closed-circuit breathing apparatus has2 L of oxygen at200 bar. Consumption is2 L/min at ambient pressure. Under the ideal capacity approximation, find maximum supply duration in minutes, as an integer.
Using the constant-temperature pressure–volume relation, the stored oxygen corresponds to about2×200=400 L at1 bar. Divide by2 L/min to obtain200 min. This is the source’s ideal maximum; it neglects unusable residual pressure and other apparatus limitations.
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