AWS Welding Inspection and Testing Certification Practice Test

What is the approximate psi of a fully charged oxygen cylinder at 70 degrees?

1. 150 psi

2. 225 psi

3. 300 psi

4. 350 psi

The correct answer is: 150 psi

The appropriate psi for a fully charged oxygen cylinder at approximately 70 degrees Fahrenheit is around 2200 psi, not 150 psi. This is a standard measurement for high-pressure cylinders used in welding and cutting applications. Oxygen cylinders are typically filled to a pressure of about 2200 psi at a temperature of 70 degrees. The given option of 150 psi may represent a significant drop in pressure, possibly indicating an empty or nearly empty cylinder rather than a fully charged one. Full cylinders should maintain this high pressure under normal temperatures, and any substantial deviation from this would indicate an issue with the cylinder itself. It's essential to understand that maintaining the integrity of the pressure in oxygen cylinders is crucial for safety in welding operations, as low-pressure readings can lead to dangerous situations where adequate oxygen supply for combustion is compromised.