How long can a D size oxygen tank with a pressure of 1000 psi last if used at a flow rate of 15 LPM?

To determine how long a D size oxygen tank can last at a flow rate of 15 liters per minute (LPM) when the tank has a pressure of 1000 psi, it's essential to understand the tank's capacity and how to calculate the duration based on the flow rate.

A D size oxygen tank typically holds about 350 liters of oxygen when full. The pressure (in psi) is proportional to the volume of gas available. Using the standard conversion, we can find the approximate volume of oxygen in the tank at 1000 psi. The formula used to estimate the amount of oxygen is:

Volume of oxygen (liters) = ( Tank constant × Pressure (psi) )

For a D size tank, the tank constant is approximately 0.159 (in liters per pressure unit). Thus:

Volume of oxygen = 0.159 × 1000 psi = 159 liters.

Now, to see how long this will last at a flow rate of 15 LPM, you would divide the total available volume by the flow rate:

Duration (minutes) = Total volume of oxygen / Flow rate

Duration = 159 liters / 15 LPM = 10.6 minutes.

However, the question specifies the closest duration that