When replacing a cylinder, what safety steps must be taken?

When replacing a cylinder, what safety steps must be taken?

• A. Open the valve quickly and swap the cylinder.
• B. Close the valve fully, relieve residual pressure, disconnect safely, install a full cylinder, and verify valve operation and seal.
• C. Leave the old cylinder attached and swap in place.
• D. Remove without depressurizing.

Answer: (B)

The key idea is to isolate and purge the high-pressure gas before handling the cylinder. Replacing a cylinder while the system is still charged can lead to a sudden gas release, which is dangerous for you and can damage the regulator and seals. The safe sequence is to fully close the cylinder valve to shut off incoming gas, then purge the remaining pressure from the regulator and lines, disconnect the empty cylinder, install a full cylinder, and then verify that the valve operates smoothly and that the seal is intact. After installation, reopen the valve and perform a leak check and function test to confirm there are no leaks and the regulator and gauges read correctly. This approach minimizes the risk of injury and equipment damage and ensures the system remains secure during the change.

The key idea is to isolate and purge the high-pressure gas before handling the cylinder. Replacing a cylinder while the system is still charged can lead to a sudden gas release, which is dangerous for you and can damage the regulator and seals. The safe sequence is to fully close the cylinder valve to shut off incoming gas, then purge the remaining pressure from the regulator and lines, disconnect the empty cylinder, install a full cylinder, and then verify that the valve operates smoothly and that the seal is intact. After installation, reopen the valve and perform a leak check and function test to confirm there are no leaks and the regulator and gauges read correctly. This approach minimizes the risk of injury and equipment damage and ensures the system remains secure during the change.