Pipe has base wall made of metallic material and pipe ends, in which outer and inner diameters of pipe ends and total thickness of base wall can be changed to achieve optimum roundness for connection with another pipe

摘要

The pipe has a base wall (G) made of metallic material, and pipe ends (L). The outer diameter (Da) or inner diameter (Di) of each pipe end or the total thickness (dges) of the base wall of the pipe can be changed to achieve optimum roundness for connection with another pipe. A protective layer, made of resistive coating material, is formed inside or outside of the pipe over the entire length of the pipe. An independent claim is included for the pipe manufacture.