The main type of pipe that used in Oil pipeline is carbon steel pipe, including seamless steel pipe and welded steel pipe.
Seamless steel pipe is applicable to transport strong corrosive oil or transport in the high temperature conditions as it has the characteristics of high strength, specifications and more features. The technology of seamless steel pipe includes hot rolling and cold drawn.
Welded steel pipe includes LSAW steel pipe and SSAW steel pipe. The process characteristics of carbon steel pipe leads the steel pipe to tend to become brittle at low temperatures, so it is mainly applied to the normal temperature pipeline, the use of pipe temperature should not exceed 300 degrees Celsius. In general, the temperature of ordinary carbon steel pipe is between 0 to 300 degrees Celsius. If using the high-quality carbon steel pipe, the temperature range can be broadened from -40 to 450 degrees Celsius. The experimental pressure of the steel pipe is generally 1.5 times of the nominal pressure. When the temperature of the material delivered does not exceed 200 degrees Celsius, the working pressure is the nominal pressure. When the temperature exceeds 200 degrees Celsius, the working pressure should be correspondingly lower than the nominal pressure.