What type of piping is specifically limited to schedule 40 or 80 when used in plumbing?

In plumbing applications, both PVC (Polyvinyl Chloride) and ABS (Acrylonitrile Butadiene Styrene) piping are commonly restricted to Schedule 40 or Schedule 80 standards. The Schedule designation refers to the wall thickness and pressure rating of the pipe, which is critical for ensuring they can handle the pressure and conditions of the plumbing system.

PVC piping is widely used due to its corrosion resistance, lightweight nature, and ease of installation. It is manufactured in various schedules, with Schedule 40 being the most common for residential applications and Schedule 80 being utilized in more demanding environments where higher pressures may be present.

Similarly, ABS piping is known for its durability and is also subject to the same scheduling limitations as PVC. Like PVC, it is rated for certain applications and must adhere to national and local plumbing codes, which clearly specify the use of either Schedule 40 or Schedule 80.

In this case, the inclusion of both PVC and ABS under the same limitation recognizes that they are both viable materials for plumbing that need to conform to these specific standards to ensure safety and functionality in the plumbing system.