Schedule and Pressure Considerations. For PVC and similar materials, the nominal size is a rounded reference number that does not directly correspond to either the ID or the OD in inches.
Understanding PVC Pipe OD Standards and Schedules
Practical Measurement for Your Project So, how do you determine the right pipe for your project? If you are replacing a section of pipe, the best practice is to measure the existing pipe. For rigid pipes like PVC, the wall thickness can vary based on the pressure rating and the schedule of the pipe.
The short answer is that it depends on the standard and the application, but the industry standard for most common pipe specifications is nominal size, which is closely related to the Inside Diameter (ID). It ensures that a pipe labeled 1-inch will fit into a fitting also labeled 1-inch, even if the physical measurements are slightly different.
Understanding PVC Pipe Outside Diameter Standards
Why Nominal Size Confuses DIY Enthusiasts The confusion usually arises when a DIYer measures a pipe with a tape measure and finds that a "1-inch" pipe does not measure one inch inside. The Role of Nominal Pipe Size Because the inside diameter is directly related to the flow rate and pressure capacity, while the outside diameter is critical for fittings and physical space, the pipe industry uses a system called Nominal Pipe Size (NPS).
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