① The width of the crack must not be greater than {{0}}.8mm. The vertical length of the pipeline should not be greater than the perimeter of the pipeline, and it should not be greater than 2.0m.

② The agreed deviation of the thickness of the anticorrosive layer and the depth of the disadvantages of the appearance of the hemp point, the empty nest should be in line with the rules. The disadvantage area should not be greater than 5cm2.

③ The flatness request is obsessed with the tube wall along the vertical axis direction of the pipeline. The gap between the appearance of the anti -corruption layer and the ruler should be less than 2mm.

④ The area of ​​empty drums must not exceed 2 per 1m2, and each place must not be greater than 100cm2.