What does the designation 'schedule 80 extra strong' refer to?

The designation 'schedule 80 extra strong' specifically refers to the wall thickness of the pipe. In piping systems, particularly those involving high-pressure applications, the wall thickness is a critical factor that determines the pipe's ability to withstand internal and external pressures. Schedule numbers, such as schedule 80, categorize the thickness of the walls for pipes of a certain diameter, with higher schedule numbers indicating thicker walls. This allows engineers and technicians to select appropriate piping materials for specific applications, ensuring safety and efficiency in operation. Therefore, understanding wall thickness is essential in various industries, especially those involving fluid transport under pressure.