The main differences between tubes and pipes in the standard

Different shape

The tube has a square tube mouth, a rectangular tube mouth, and a round shape; the pipes are all round;

Different roughness

Tubes are rigid, as well as flexible tubes made of copper and brass; pipes are rigid and resistant to bending;

Different classification

Tubes according to outer diameter and wall thickness; pipe according to wall thickness code pipe schedule and nominal diameter (European Standard) = national pipe size (American Standard)

Using environment is different

Tubes are used when small tube diameters are needed. 10 inch tubes are rare. Pipes are used when large tube diameters are required. 10 inch tubes are common, ranging from half-inch to several feet.

Different focus requirements

The tube pays attention to the accuracy of the outer diameter, because it involves pressure, which is used for cooler tube, heat exchanger tube, and boiler tube; the pipe pays attention to the wall thickness, because the pipe mainly transports fluid and requires high internal pressure capacity;

Wall thickness is different

The wall thickness level of the tube is increased by 1 level, and the wall thickness is increased by 1mm or 2mm, and the increase is fixed. The wall thickness of the pipe is expressed by schedule. The relationship between the values of the various levels is uncertain. The connection of the pipe is labor-intensive and can be welded. It can also be connected by thread or flange.