Anticorrosive steel pipe factory tutors you how to deal with the surface of anticorrosive spiral steel pipe; After mechanical damage occurs on the surface of anti-corrosion spiral steel pipe, we need to do it. Generally, what method do we use? Today, anti-corrosion steel pipe manufacturers share a skill!
For surface mechanical damage, the method of adding sleeve is generally adopted. The sleeve is composed of two pieces, and the two longitudinal welds are welded by two laths by Nuo welding. The utility model has the advantage that there is no weld on the body of the steel pipe. The longitudinal seam is a butt weld with lining plate, and the pipe body itself becomes the lining plate of the upper and lower sets. Either way.
When the scratch does not cause leakage, the two annular fillet welds between the sleeve and the spiral steel pipe body do not need to be welded. In case of leakage, they need to be welded. At this time, the sleeve is directly subjected to the internal pressure caused by liquid. Therefore, in this case, the thickness of the sleeve is generally not less than the pipe wall thickness.
The method described above is a repair method for mechanical damage found during construction. In case of leakage (not yet broken) in the operating state, the upper and lower sleeves are generally connected by bolts, and there is an annular sealing ring inside the sleeve. With the tightening of the stud, the seal is pressed between the spiral steel pipe body and the sleeve, so that oil and gas will not leak out, and there is also a seal in the longitudinal direction.