When pressure testing completed copper tubing assembly with pressurized nitrogen the nitrogen cylinder should

• A. On a raised platform
• B. In a cabinet
• C. Always be on the ground
• D. Hung from a crane

Answer: (C)

During pressure testing with nitrogen, the safety focus is on keeping the gas cylinder stable and easy to control. The cylinder should be kept on the floor in an upright, secured position so it can’t tip, fall, or be struck, and so you can quickly reach the valve and regulator if you need to shut the flow off. A ground placement minimizes the risk of a high fall or impact hazards and makes securing the cylinder to a fixed support straightforward.

Placing the cylinder on a raised platform increases tipping and collision risks and can complicate access to the regulator. Putting it in a cabinet could trap gas or heat and hinder quick shutoff or movement. Hanging from a crane introduces unnecessary hazards and risk of uncontrolled movement of a heavy cylinder. So, keeping the nitrogen cylinder on the ground is the safest and most practical approach for this task.