A technician handles a high-pressure refrigerant cylinder in a hot truck bed in summer. Which practice is safest for storing and transporting the cylinder?

Explanation

High-pressure cylinders should be kept out of direct sun and below their temperature rating, secured upright, and never filled beyond 80% of capacity, because heat raises internal pressure and overfilled cylinders can rupture. Direct sunlight and heat sources dangerously increase pressure. Cylinders must also be kept away from open flames and secured so they cannot fall.