Schedule 40 vs Schedule 80 CPVC Pipes

A CPVC pipes schedules indicate the thickness of the pipe walls. Sch 80 pipes have thicker pipe walls and are costlier compared to Sch 40 pipes. Only the inner diameter will change and the CPVC pipes diameter will remain the same for both the schedules. ASTM ( American Society for Testing and Materials ) have come up with the schedule 40 and 80 for different plumbing applications.

Pressure

Schedule 40 pipes are best suited for domestic purpose where water pressure is relatively low. Schedule 80 pipes can withstand higher pressures, so they are preferred for industrial and chemical purposes. Just to give you a difference, 1 Inch schedule 40 pipes can withstand up to 450 PSI whereas 80 Schedule can withstand up to 640 PSI (Pounds Per Square Inch)

Sizing & Water Flow

As schedule 80 have thicker walls, it might have slight tighter water flow compared to Schedule 40.

Applications

Schedule 40 is used for water supply, Irrigation, and home purposes. Schedule 80 is used for heavy industrial and chemical transport applications.