Using the H cylinder duration formula (Pressure × Cylinder factor ÷ Flow rate), what is the expected duration in minutes for a cylinder at 1600 psi with a flow rate of 8 L/min?

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Using the H cylinder duration formula means estimating how long the gas will last by multiplying the cylinder pressure by the cylinder factor to get the total available gas, then dividing by the flow rate. For an H cylinder, the factor is 3.14 L per psi. So at 1600 psi, the total gas is 1600 × 3.14 ≈ 5024 L. With a flow of 8 L/min, the duration is 5024 ÷ 8 ≈ 628 minutes. That’s about 10 hours and 28 minutes of continuous flow. The correct approach hinges on using the correct cylinder factor for the H cylinder; other sizes use different factors (for example, a smaller factor would yield a much shorter duration).