The Difference Between Schedule 40 PVC and Schedule 80 PVC
PVC And CPVC Pipes And Fittings
Schedule 80 pipe is more expensive than schedule 40 pipe because of the additional thickness. The outside diameter of a schedule 80 pipe and a schedule 40 pipe are the same, 80 pipe has thicker walls. This standard of measuring pipe came from a need to have a universal system for referring to PVC wall thicknesses, the ASTM (American Society for Testing and Materials) came up with the system for classifying the three common types. There is a schedule 120 but it is not for home use.
Schedule 40 Pipe Pressure Rating vs Schedule 80 Pipe Pressure Rating
Schedule 40 PVC and schedule 80 PVC are widely used. But each one with different applications. Schedule 40 pipe’s thinner walls are best for applications dealing with low water pressure.
My own experiences with schedule 80 were in an industrial situation. In this case, the PVC pipes experienced vibration. Thicker walls of the schedule 80 helped to reduce failure due to stress cracking.
Schedule 80 Threaded Pipe
. This makes it ideal for industrial and chemical applications. To give you an idea of the difference, 1” schedule 40 PVC pipe has a .133” minimum wall. It can handle a pressure rating of 450 PSI, while schedule 80 has a .179” minimum wall and can handle a pressure rating of 630 PSI.
Schedule 40 PVC and Schedule 80 PVC Color and price differences
Schedule 40 PVC pipe is white in color, while schedule 80 PVC is often gray distinguishing it from schedule 40 PVC. Price is always a tell-tale sign that you have schedule 80 PVC in your basket.
PVC Electrical Junction Box
Which Schedule PVC do I Need?
So what schedule PVC do you need? If you have a home irrigation project, schedule 40 PVC is the way to go. PVC schedule 40 cannot handle the temperature of hot water. Its maximum temperature rating is 140º. If your project is dealing with hot or cold water inside your home CPVC might be the one for you. You will need to check with your city/county building inspectors for code regulations in your area.
Related Article: Reusing PVC Fittings
Related Article: How To Cut Deburr Glue PVC Pipe
(By Proleskovskiy (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons)
(By Proleskovskiy (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons)
(By Erik Wannee (Own work) [CC0], via Wikimedia Commons)
(By Pacific Northwest National Laboratory, Department of Energy [Public domain], via Wikimedia Commons)
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