The American National Standards Institute has standardized pipe wall thicknesses for different applications. These include Schedule 10, Schedule 40, Schedule 80, and Schedule 160. Schedule 40 is the most common pipe thickness used in construction work. This standard offers an ideal balance between cost, strength, and ease of installation.
If the pipes are exposed, or if there is a need to transport high-temperature or high-pressure water or gas, then Schedule 80 or Schedule 160 pipes may be required. Schedule 10 is reserved for light-duty applications.