Depending on the use and subsequent production process. It can be roughly divided into scaffolding pipe, fluid pipe, line casing, bracket pipe and guardrail pipe. Low pressure fluid welded pipe is a straight seam welded pipe. After the welding is completed, another hydrostatic test is performed on the water and gas delivery, so the price of low-pressure fluid pipes is usually higher than ordinary longitudinal welded pipes, such as: 1 inch (DN25) (i.e. 33.5 * 3.25) welded steel pipe fluid. Welded steel pipe is also called welded pipe. After bending, it is welded with steel plates or steel strips. According to the welding seam form, it is divided into straight seam welded pipe and spiral welded pipe. According to the use, it can be divided into ordinary welded pipes, galvanized welded pipes and oxygen blown welded pipes, wire casings, transformer pipes, thin-walled pipe welding, special-shaped pipe welding and spiral welded pipes.
General-purpose welded pipe: This welded pipe is mainly used to transport low-pressure liquid or fluid. Of course, in addition to these types of steel, there are also some easily weldable steels that can be used to make general-purpose welded pipes. This kind of steel pipe has certain requirements for surface quality. Such steel pipes should be tested for hydraulic pressure, bending and flattening.
- The following points should be paid attention to when using straight seam steel pipes:
1. Construction preparation before using straight seam steel pipes
In order to excavate the pipe trench and complete the pipe well masonry, various straight seam steel pipes need to be installed, and various tools are required, including electric welding machines, cutting machines, electric hammers, polishing machines, etc. All equipment is ready, and installation can only begin after a series of preparatory work is completed.
2. Installation of straight seam steel pipes
- The pipelines are positioned according to the drawing design and the pipe racks are prefabricated according to the site conditions. The Use quality requirements
1. Branch pipes should not be welded at the weld. Avoid welding at the elbow.
2. The vertical installation deviation per meter should be less than 3 mm. The deviation per meter for horizontal installation should be less than 1 mm.
3. The welding seam must be straight and full, and there should be no burn-through or cracks on the surface of the welding seam.
