What allows Schedule 80 pipe to withstand higher PSI?

Schedule 80 pipe is specifically designed with thicker walls in comparison to other pipe schedules, such as Schedule 40. This increased wall thickness provides greater structural integrity, allowing the pipe to handle higher internal pressures. The material used in Schedule 80 pipe is typically the same as that of Schedule 40, but the added thickness enhances its ability to resist deformation and rupture under pressure. This is particularly important in applications where high PSI is present, making Schedule 80 pipe suitable for more demanding industrial and plumbing situations. Therefore, the thicker walls are the key factor that enables it to endure greater pressure levels effectively.