Line pipe is made of high-strength carbon steel, and it is usually manufactured in accordance with the metallurgical specifications set by the American Petroleum Institute (API). Carbon steel line pipe can be used to build pipelines that transport various resources, including natural gas, oil, petroleum, and water. This pipe is available in a variety of diameters, ranging from 2 inches to 48 inches.
Line pipe includes seamless and welded pipes, and its pipe ends are flat ends, threaded ends, and socket ends; its connection methods are end welding, coupling connection, socket connection, etc. The main materials of the pipe are L245, L290, L360, L415, L480, GR.B, X42, X46, X56, X65, X70, X80, X100 and other steel grades.
In most cases, the main pipeline for transporting oil requires a diameter of about 16 to 48 inches. Pipelines that transport oil to or from the trunk line can use pipes with a diameter of 6 to 16 inches.
API 5L Line pipe Mechanical properties
| Pipe Grade | Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1 | Seam of Welded Pipe | ||
|---|---|---|---|---|
| Yield Strength a | Tensile Strength a | Elongation | Tensile Strength b | |
| Rt0,5 PSI Min | Rm PSI Min | (in 2in Af % min) | Rm PSI Min | |
| A | 30,500 | 48,600 | c | 48,600 |
| B | 35,500 | 60,200 | c | 60,200 |
| X42 | 42,100 | 60,200 | c | 60,200 |
| X46 | 46,400 | 63,100 | c | 63,100 |
| X52 | 52,200 | 66,700 | c | 66,700 |
| X56 | 56,600 | 71,100 | c | 71,100 |
| X60 | 60,200 | 75,400 | c | 75,400 |
| X65 | 65,300 | 77,500 | c | 77,500 |
| X70 | 70,300 | 82,700 | c | 82,700 |
