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). If you are starting a new installation, you should rely on the nominal size printed on the pipe or specified in the plumbing code for your area.
PVC Pipe ID Chart Lookup Guide: Find Exact Inside and Outside Diameters
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). This standardization is crucial for construction and plumbing, as it allows components from different manufacturers to work together seamlessly.
The key takeaway is that you should always refer to the specific pipe chart for the exact ID and OD of a specific wall schedule. Historically, for pipes ranging from 1/8 inch to 12 inches, the nominal size was originally based on the Inside Diameter for pipes 12 inches and smaller.
PVC Pipe ID Chart Lookup Guide: Find Exact Inside and Outside Diameters
Comparing these numbers to a standard PVC pipe chart will reveal the schedule and nominal size of the existing material. To determine the effective ID, you should measure the inner diameter of the pipe using calipers or a tape measure.
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