The most common use of steel pipes is for the transportation of products, as the characteristics of their raw materials are well suited for long-term installation. As the best way to transport oil and natural gas, steel pipe transportation has become the best choice for oil and natural gas transportation because of its larger volume and continuous flow, faster, more economical, less injection capital, less land, low cost, and the advantages of automatic control. Because of these advantages, many places also use steel pipes to transport solid energy, such as coal. The principle of pipeline transportation is the use of the principle of the connector, through the pressure difference so that the fluid in the tube from high to low flow. During the conveying process, the pressure of the fluid decreases gradually due to friction loss and elevation difference. To pressurize the fluid, long-distance transport requires intermediate pumping or compressor stations. Product name: steel pipe, transportation; Standard: ASTM, ASME and API; Grades: API 5L Gr. X42/X46/X52/X56/X60/X65/X70/X80and higher. PSL-1/PSL-2. ASTM A106 Gr. B/C. ASTM A53 Gr. B; Size: 1/2 inch to 12 inch, 14 inch, 16 inch, 18 inch, 20 inch, and 24 inch for seamless; Wall thickness: SCH 10, SCH 20, SCH 30, SCH 40, STD, XS, SCH 60, SCH 80, SCH 100, SCH120, SCH160, XXS; Length Range: 20 FT (6 meter), 40FT (12 meter)or customized; Ends Type: Beveled ends, Plain ends; End Protection: plastic Caps or iron Caps; Surface Coatings: Natural, Varnished, Black painting, 3PP, FBE and 3PE, Cladding and Lined etc.