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. 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.
How to Measure PVC Pipe ID Correctly
To determine the effective ID, you should measure the inner diameter of the pipe using calipers or a tape measure. They then assume the labeling is incorrect.
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. ID stands for Inside Diameter, which is the measurement of the hollow core inside the pipe.
How to Measure PVC Pipe ID Accurately for Your Project
Comparing these numbers to a standard PVC pipe chart will reveal the schedule and nominal size of the existing material. A frequent question that arises during this process is whether PVC pipe is measured ID or OD.
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