Final answer:
Approved refrigerant recovery cylinders can be identified by their specific color code: gray with a yellow top. This color code signifies that the cylinder is designed and approved for refrigerant recovery purposes.
Step-by-step explanation:
Approved refrigerant recovery cylinders can be identified by their specific color code. The color code for these cylinders is gray with a yellow top, which indicates that the cylinder is designed and approved for refrigerant recovery purposes.
For example, in the United States, the Environmental Protection Agency (EPA) has established specific guidelines for refrigerant recovery cylinders. The gray color of the cylinder signifies that it is specifically designated for use with refrigerants. The yellow top indicates that the cylinder is approved for use with hydrochlorofluorocarbon-22 (HCFC-22), a common refrigerant.
It is important to use the correct color-coded cylinder for refrigerant recovery to ensure safety, proper handling, and compliance with regulations.