Straight seam steel pipes are widely used in various industries such as petroleum, metallurgy, construction, coal mines, ports, machinery, etc. There are strict technical requirements for the installation and use of straight seam steel pipes, and they should be operated simultaneously according to the actual situation to ensure quality. In normal use, the following points should be noted for straight seam steel pipes:
Straight seam steel pipe installation: According to the design of the drawings, the steel pipes are positioned, the steel pipe brackets are prefabricated according to the site conditions, and then they are designed and cut on site as needed, and then chamfered with a polishing machine, and then welded.
Quality requirements for the use of straight seam steel pipes:
1. The deviation per meter for horizontal installation should be less than 1mm, and the deviation per meter for vertical installation should be less than 3mm.
2. Avoid welding branches at the welding point and welding at the elbow.
3. The weld is required to be straight and full, and there is no burn-through or crack on the weld surface.
There are strict technical requirements in the application process of straight seam steel pipe equipment, which must be carried out in the steel pipe. According to the actual conditions and operating specifications, ensure the safety and quality of straight seam steel pipes. So what should be paid attention to when using straight seam steel pipe equipment?
The steel pipe groove should be dug according to the requirements of the drawings, the steel pipe well has been built into bricks, and the required various straight seam steel pipes have been delivered with good quality and qualified inspection. The required construction items including electric welders, cutting machines, electric hammers, polishing machines, etc. are fully prepared, and only a series of preparatory work is required to make the initial equipment.
According to the plan layout of the drawings, the steel pipe bracket is prefabricated according to the site conditions, and then the materials are cut according to the plan and on-site, and then the groove is polished with a grinder, and then welded. During the welding process, the strip steel is sent to the welding steel pipe unit. After multiple rolling, the strip steel is gradually rolled into a round tube blank with an open space. Adjust the reduction of the pinching roller to control the weld spacing at 13mm and make the two ends of the weld flush. If the open space is too large, the adjacent effect will be reduced, the eddy current will be lacking, and the weld will not be welded or cracked due to poor intercrystalline joints. If the open space is too small, the proximity effect will increase and the welding heat will be too large, which will cause the weld to burn; after pinching and rolling, the weld may form deep pits, which will affect the surface quality of the weld.
Welding of branch pipes at the weld is not allowed, and welds at elbows should be avoided. The error per meter of the vertical equipment riser should be less than 3 mm, and the error of the horizontal equipment riser should be less than 1 mm. The surface quality of the longitudinal welded pipe should be smooth, and defects such as wrinkles, cracks, delamination, and lap welding are not allowed. Small defects on the surface of the straight seam pipe (such as scratches, scratches, weld misalignment, burns, and scars) shall not exceed the negative error of the wall thickness.
Post time: Jul-04-2025