Avoid the 3PE anticorrosive layer tube side appear warped edge of what measures?

Avoid the 3PE anticorrosive layer tube side appear warped edge of what measures?
Three layer polyethylene coating (3PE) has excellent comprehensive properties of fusion bonded epoxy powder coating and extrusion two polyethylene anticorrosive coating, interfacial properties of fusion bonded epoxy powder coating and chemical resistance properties, combined with polyethylene coating extrusion mechanical protection characteristics, thereby significantly improving their performance. Therefore, the outer protective layer of the buried pipeline is very superior. Three layer PE can make the life of the buried pipeline up to 50 years, at present, in the world is considered to be the most advanced pipeline external corrosion protection technology. In China, the three tier PE has been the first to be applied in the oil and gas system. Chinese has built the Shaanxi Beijing gas pipeline and Korla Shanshan oil pipeline, the recent national key project west east gas pipeline nearly 4000 kilometers are adopted three layers of PE external coating.
1 epoxy powder coating is reserved only to protect the integrity, in order to delay the pipe end due to corrosion caused by the edge of the. With the wire wheel grinding way of domestic polyethylene pipe end groove processing, can damage the epoxy powder coating. Should use mechanical chamfering edge to the bottom, the cutting depth limiting device to control the tool, so as not to hurt the epoxy powder coating.
2 without affecting the mouth welding conditions, should be appropriate to increase the reserve length polyethylene layer end epoxy powder, can prevent steel long stack, 3PE anticorrosive pipe end metal corrosion caused by alice.
3 strict control of the pipe end of the weld residual high repair quality. In the weld slope and the pipe body as polyethylene outside the other parts, the epoxy powder retention length >20mm, to prevent Weld Epoxy Corrosion Caused by bottom first 3PE anticorrosion layer alice.
4 anti-corrosion pipe in the open air for a long time, should be covered at the pipe end to prevent rain erosion, resulting in serious corrosion of the pipe.
5 if the pipeline site construction period is longer, can be in the tube end metal exposed to paint can be welding rust proof paint, in order to prevent corrosion protection pipe in the storage period due to corrosion caused by 3PE anti corrosion layer edge.
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