Straight seam steel pipe is widely used in various industries, including petroleum, metallurgy, construction, coal mining, ports, and machinery. The installation and use of straight seam steel pipes have strict technical requirements and must be performed according to actual conditions to ensure quality. During normal use, the following points should be observed when using straight seam steel pipes:
Straight Seam Steel Pipe Installation
The steel pipes are positioned according to the design drawings. Steel pipe supports are prefabricated according to site conditions. The pipes are then designed and cut on-site as needed. The edges are then chamfered with a polishing machine and welded.
Quality Requirements for Using Straight Seam Steel Pipes
1. Horizontal installation should have a deviation of less than 1mm per meter, while vertical installation should have a deviation of less than 3mm per meter.
2. Avoid welding branches or elbows at the weld joint.
3. The weld seam must be straight and full, with no burn-through or cracks on the weld surface.
Straight seam steel pipe installations have strict technical requirements and must be carried out according to actual conditions and operating specifications to ensure the safety and quality of straight seam steel pipes. So, what should you pay attention to when using straight seam steel pipe equipment? The steel pipe trenches were dug according to the drawings, the steel pipe wells were bricked, and the required straight seam steel pipes were delivered in good condition and passed inspection. The required equipment, including electric welders, cutters, electric hammers, and polishers, was fully prepared, requiring only a few preparatory steps to complete the initial equipment. The steel pipes were laid out according to the drawings, and steel pipe supports were prefabricated according to the site conditions. The material was then cut according to the drawings and on-site, and the grooves were polished with a grinder before welding. During the welding process, the strip steel was fed to the welding pipe unit. After multiple rolling passes, the strip steel was gradually rolled into a round pipe blank with an open space. The reduction of the kneading rollers was adjusted to maintain the weld spacing at 13mm and ensure that the weld ends were flush. If the open space is too large, the proximity effect will be reduced, eddy currents will be insufficient, and the weld may not weld or crack due to poor intergranular joints. If the open space is too small, the proximity effect will be increased, and the welding heat will be excessive, resulting in weld burning. After kneading and rolling, deep pits may form in the weld, affecting the surface quality. Welding of branch pipes at the weld seam is not permitted, and welds at elbows should be avoided. The tolerance per meter for vertical equipment risers should be less than 3 mm, and for horizontal equipment risers, the tolerance should be less than 1 mm. The surface quality of longitudinally welded steel pipes should be smooth, and defects such as wrinkles, cracks, delamination, and lap welds are not permitted. Minor surface defects on straight seam steel pipes (such as scratches, nicks, weld misalignment, burns, and scars) must not exceed the negative tolerance of the wall thickness.
Post time: Sep-09-2025