How to distinguish the greenhouse pipe according to its production process

How to distinguish the greenhouse pipe according to its production process?
It can even be made of non-metallic materials such as plastic.
The fluid tube needs to have a hollow section, but it can also be square, triangular or any other shape. Some equipment is limited by conditions, and a rectangular tube is required, but most of them use a round tube. The round tube has a smaller perimeter/area ratio in all geometric sections, ie a larger internal section can be obtained with the same amount of material.
Because of its low cost and high strength, steel pipes are widely used in fluid transportation in modern society. According to the production process, the greenhouse steel pipe is divided into two categories: seamless steel pipe and welded pipe. The welded pipe is divided into high frequency straight seam welded pipe (HFW), spiral welded pipe (SSAW) and submerged arc welded pipe (UOE). In the past, fluid pipes have traditionally used seamless steel pipes. With the development of materials science, molding processes, and unit equipment, welded pipes have been greatly developed. The welded pipe has the advantages of better uniformity than the seamless pipe wall, high precision, low energy consumption and high production efficiency. The oil and gas pipeline (API standard) is very demanding. In the past, almost 100% of the seamless pipes were used. More than 95% of the developed countries in the United States, Japan, and Europe have been replaced by welded pipes.
When the welded pipe is used as a conveying fluid pipe, it has different requirements from ordinary steel pipes:
1, the weld is not allowed to leak. For welded pipes requiring APIs, it is also required to perform ultrasonic testing and hydrostatic testing on the welds of each welded pipe;
2. For the transportation of corrosive chemical solutions, all steel pipes need to be treated with anti-corrosion treatment of the inner wall;
3, the fluid tube needs to remove the internal burrs to reduce the fluid transport resistance.

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