AEMCA Practice Exam

How long would a D tank with 1400 psi last while transporting a patient on a non-rebreather mask at 12 L/min?

1. 8 minutes

2. 10 minutes

3. 12 minutes

4. 15 minutes

The correct answer is: 12 minutes

To determine how long a D tank filled with 1400 psi will last while transporting a patient on a non-rebreather mask at a flow rate of 12 L/min, it's essential to understand how to calculate the tank's usable time based on its pressure and the flow rate. A standard D tank holds about 340 liters of oxygen when full. The pressure of 1400 psi indicates how much oxygen is available in the tank. The formula to estimate the remaining time for the tank is: 1. First, convert the psi to liters using the conversion factor specific to the oxygen tank. The formula is as follows: \[ \text{Liters of O2} = \text{Pressure (psi)} \times 0.3 \] For a tank at 1400 psi: \[ \text{Liters of O2} = 1400 \, \text{psi} \times 0.3 = 420 \, \text{liters} \] 2. Next, divide the total liters of oxygen available by the flow rate (in liters per minute) to calculate the time: \[ \text{Time (minutes)} = \