3pe anti-corrosion steel pipe warping problem
3PE anticorrosive coating has been widely used in the field of oil pipeline because of its good anti-irritant and anti-water permeability.
However, some friends said that one side of this kind of 3PE anti-corrosion layer steel pipe is very easy to cause the situation of crooked edge, the main factor causing this situation is that the 3PE anti-corrosion layer steel pipe in the grinding treatment of the section of the polyethylene layer, the wrong side of the pipe end welding amount is not polished smooth
3pe anti-corrosion steel pipe warping problem
The remaining size of the epoxy powder at the end of the polyethylene layer can be moderately increased without compromising the standard of pipe welding, so as to avoid 3PE anti-corrosion warp due to metal corrosion.
If the 3PE anticorrosive pipe is accumulated outdoors for a long time, it must be covered on one side to avoid being eroded by sewage when it is rainy in spring and summer, resulting in corruption on the other side.
If the engineering period of the pipeline is relatively long on the spot, we can carry out brushing on one side of the metal so as to avoid rust and avoid warping. It can also adjust the amount of welding errors left on one side.
In view of the fact that the polyethylene profile at the weld is the same as the other parts of the pipe body, the specification of the epoxy powder must be promoted to exceed 22mm, so that the edge of the epoxy powder bottom at the welding can be avoided.
At this time, we must pay attention to these when welding and grinding on one side, and there should be a smooth section of 10~22mm from the welding grinding to the polyethylene cutting Angle, so as to ensure the bonding quality of the extrusion at the polyethylene cutting edge.
After grinding, the amount of the wrong side as far as possible to ensure that it is flush with the tube body, and the solved must be different and rich, so that we want to avoid polishing the epoxy powder together when polishing the cutting Angle of the polyethylene layer.
The cutting Angle of the transition section between the top of the welding and the grinding place should not be greater than 30°, so as to facilitate the extrusion pressure of the extrusion roll to apply symmetrical pressure on the polyethylene layer, and also improve the warping situation.
The importance of anticorrosive coatings for steel pipes
3PE anticorrosive steel pipe anticorrosive coating is very important for the service life of buried pipelines. Some pipes of the same material have not corroded underground for decades, and some have leaked within a few years.
Because they use different external anti-corrosion layers, ordinary steel pipes will suffer serious corrosion in harsh environments, thereby reducing the service life of the steel pipe, and the service life of the anti-corrosion insulation steel pipe is relatively long. Generally, it can be used for about 30-50 years, and the correct installation and use can also reduce the cost of tube maintenance.
