What are the sizing differences between PVC pipe, and PVC rigid tubing and PVC flexible tubing?

Q. What are the sizing differences between PVC pipe, and PVC rigid tubing and PVC flexible tubing?
A. PVC rigid tubing measured and listed by the actually dimensions the inside and outside diameter measure.
For instance: 1/2” rigid PVC tubing is 1/2” outside diameter and 3/8” inside diameter. The fittings that can be used for this type of tubing are compression fittings or flexible fittings that can be clamped onto the PVC tube.

PVC flexible tubing is measured and listed in the same way as the rigid tubing, you would measure the outside and inside diameters. The difference is the type of fittings that you would use. Hose barbs or inserts fittings should be used and they get inserted into the tubing. That is why you would go by the inside diameter of the tubing to determine the size fitting you would need.
For instance: 1/2” outside diameter tubing with a 3/8” inside diameter would require a 3/8” hose barb or insert fitting.
 
PVC pipe sizes are nominal, so for most pipe sizes the pipe is neither the outside nor the inside diameter. PVC pipe is socket fittings (schedule 40) and socket or threaded fittings (schedule 80). All socket fittings are designed to go on the outside of the pipe, not the inside. Click here for a chart showing the outside and inside diameters of SCH40 and 80 PVC pipe.
For instance: 1/2” SCH40 PVC pipe has an outside diameter of .840” and a .602” inside diameter.

Article Title:
What are the sizing differences between PVC pipe, and PVC rigid tubing and PVC flexible tubing?
Article Summary:
A brief summary on the difference in PVC.
Article Date:
5/27/2003
Article ID:
610
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