What is the difference between pipe and tubing?
• In small diameter polyethylene pipe and tubing (1/2″ through 2″) pipe used in water well systems is generally made to ASTM D2239, Inside Diameter Controlled, specifications whereas tubing used in water service lines is generally made to ASTM D2737, Outside Diameter Controlled, specifications. Pipe made to ASTM D2239 is usually called IPS or Iron Pipe Size. Tubing is usually called CTS or WST, Copper Tube Size or Water Service Tubing. Pipe made to ASTM D3035 is Outside Diameter Controlled and is also classified as IPS, Iron Pipe Size.
