9/2/22 - Zoro Staff
Regardless of whether you're using PVC or CPVC, you’ll need to be aware of the anticipated pressures associated with the use of your piping. For both types of piping, Schedule 40 and Schedule 80 refer to pipes with thinner or thicker walls that can withstand different levels of pressure. Here are answers to some common questions about the distinction between the two types.
Table of Contents
- Do Schedule 40 and Schedule 80 Pipes Handle Different Pressures?
- Are Schedule 40 and Schedule 80 Pipes Fitted Differently?
- Sizing Charts
Do Schedule 40 and Schedule 80 Pipes Handle Different Pressures?
Yes. Schedule 80 pipes have thicker walls than Schedule 40 pipes and can accommodate higher pressures. Here are some quick facts about the two types of piping:
Schedule 40 pipe
- Thinner walls, best for applications involving relatively low water pressure.
- Can handle pressure levels up to 358 psi (pounds per square inch).
Schedule 80 pipe
- Thicker walls, able to withstand higher pressure levels.
- Can accommodate pressures up to 509 psi.
Are Schedule 40 and Schedule 80 Pipes Fitted Differently?
Yes. There are differences in thickness between Schedule 40 and Schedule 80 pipes when fitting the pipes, which translates to differences in sizing and diameter. This affects the fit not only for the pipes, but also for the PVC fittings, PVC couplings, PVC elbows, PVC connectors, PVC pipe caps, and other connectors you may use to join them.
Take note of the schedule and composition (material) of each fitting you are considering to ensure affinity. Schedule 80 pipes or fittings have thicker walls, even though the exterior diameter is similar to a Schedule 40 pipe or fitting. Having the same outside diameter is possible because the extra thickness of a Schedule 80 PVC is inside the pipe.
If you’re joining pipe to an existing pipe, you’ll usually find the pipe size and schedule along the outside of the existing pipe and can use that as a handy reference for determining which type of new pipe to acquire for your project.
Finally, remember that each schedule of pipe should be fitted using the proper sealant, adhesive, or pipe dope to ensure a proper seal with no leaks.
Sizing Charts
Refer to the following sizing charts to understand the differences between Schedule 40 and Schedule 80 piping for both PVC and CPVC pipes.
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Product Compliance and Suitability
The product statements contained in this guide are intended for general informational purposes only. Such product statements do not constitute a product recommendation or representation as to the appropriateness, accuracy, completeness, correctness, or currentness of the information provided. Information provided in this guide does not replace the use by you of any manufacturer instructions, technical product manual, or other professional resource or adviser available to you. Always read, understand, and follow all manufacturer instructions.