A cylinder with an E-tank duration is calculated as Cylinder pressure × Cylinder factor ÷ Flow rate. If the pressure is 1000 psi and the flow rate is 4 L/min, what is the duration in minutes?

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Oxygen cylinder duration uses the amount of gas available in the cylinder, converted from pressure to liters, and then divided by the flow rate to get minutes. For an E-tank, the conversion factor is 0.28 liters per psi. So, multiply the pressure by this factor to get total liters: 1000 psi × 0.28 L/psi = 280 L available. Then divide by the flow rate: 280 L ÷ 4 L/min = 70 minutes. Therefore, the duration is 70 minutes.