If administering oxygen at 15 L/min from a D cylinder at 1500 psi, how long until it needs replacing?

To determine how long the oxygen cylinder will last, you need to consider the flow rate of oxygen being administered, the pressure in the cylinder, and the amount of oxygen typically contained in the cylinder.

A D cylinder typically holds about 350 liters of oxygen at full pressure. When administering oxygen at a rate of 15 liters per minute, you can calculate the duration for which the cylinder will last using the following steps:

1. Convert the pressure of the cylinder from psi to the volume of oxygen remaining. As mentioned, a full D cylinder holds approximately 350 liters of oxygen, which corresponds to 2000 psi. Therefore, if the cylinder reads 1500 psi, you can find the volume of oxygen available at this pressure by using a simple ratio:

[ \text{Remaining Volume} = \left( \frac{1500 \text{ psi}}{2000 \text{ psi}} \right) \times 350 \text{ liters} ]

2. When you perform the calculation:

[ \text{Remaining Volume} = \left( 0.75 \right) \times 350 = 262.5 \text{ liters} ]

3. Next, divide the total volume of available