Which action is not recommended during filling operations?

• A. Wear PPE
• B. Purge cylinders
• C. Secure transfer hoses
• D. Open the tank valve and leave unattended

Answer: (D)

Safety during propane filling means you must maintain control of the transfer and be able to shut it off quickly if something goes wrong. Wearing PPE protects you from exposure and injury, purging cylinders removes air and other non-condensables to prevent combustible mixtures and ensure a proper fill, and securing transfer hoses keeps them from shifting, leaking, or disconnecting during the operation. Leaving the tank valve open and walking away defeats that control. If you leave unattended, you can’t respond to a leak, a regulator or hose failure, or an overfill, all of which can lead to a dangerous release, fire, or gas buildup. Keeping a close watch and staying with the equipment is essential for a safe fill.