What is the most advanced domestic external anti-corrosion technology for bent pipes?
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Currently, for the anti-corrosion of bends used in long-distance pipelines, single-layer epoxy powder coating or double-layer epoxy powder coating is employed; 3PE coating for bends has never been seen, as it seems that the technology isn’t feasible for this purpose. Does anyone know if there are any more advanced anti-corrosion techniques?
I have done elbow pipe work before. Either epoxy powder or 3PE will work; there isn’t much difference between the two. I think in situations with poor soil conditions, 3PE performs better than epoxy powder
It is necessary to distinguish between heat bending and cold bending. For cold bending, straight pipe sections that have already been coated with 3PE for corrosion protection are typically used; whereas in the case of heat bending, bare pipes are first heated at high frequencies before being bent, after which corrosion protection is applied, usually by using PE wrapping tape, though the effectiveness of this method is not good. Another approach involves using double-epoxy powder for corrosion protection followed by protection with PP or PE tape, with it being important to ensure an appropriate thickness of the double-epoxy coating.