Pipe Schedule

The pipe schedule sets the pipe wall thickness.
Obviously increasing the wall thickness of the pipe increases the mechanical strength of the pipe, allowing it to handle higher design pressures.
The following pipe schedules are available (in order of increasing wall thickness): 5S, 10S, 10, 20, 30, 40S, STD, 40, XS (Extra Strong), 60, 80, 100, 120, 140, XXS (Double Extra Strong) and 160.