The first difference is actually pipe vs tubing. Pipe is measured at the inside diameter or ID vs tubing being measured at the outside diameter or OD. Dies for bending pipe and tubing are different because of the different measurements. A mandrel is pulled through tubing or pipe to keep the inner diameter constant.
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what is the difference between the PE pipe and HDPE pipe.
The threads
The main difference is the thickness of the pipe Compare to A Class pipe B Class pipe thickness is more.Like that Compare to B class pipe C Class pipe thickness is more.
Mandrel for drifting the casing or drill pipe is forged with high-strength alloy steel, strict heat treatment process.
Pipe Lining refers to the internal diameter, pipe coating is external.