Which schedule of carbon steel pipe is required for use with Group A2 refrigerants in sizes 1.5 inches and smaller?

The correct choice regarding the use of carbon steel pipe with Group A2 refrigerants for sizes 1.5 inches and smaller is Schedule 80. This designation indicates that the pipe has thicker walls compared to Schedule 40, providing greater pressure-holding capacity and enhanced durability.

Using Schedule 80 pipe is essential for Group A2 refrigerants, which include substances that have a low risk of flammability, to ensure safety and compliance with applicable codes. The thicker walls of Schedule 80 help resist potential stresses and pressures that can occur during refrigerant handling and maintenance. It also aids in preventing leaks, ensuring the integrity of the refrigeration system.

In applications where refrigerants are involved, optimizing material choices is crucial for reliability and safety. Hence, Schedule 80's attributes make it the preferred choice for handling the specific requirements associated with Group A2 refrigerants.