1, the appearance: the pipeline for a full-line visual inspection, in the prefabricated plant should be root-by-root visual inspection, filling, injury should be checked one by one, the surface of the anti-corrosion layer should be flat, evenly connected, no bubbles, creases and breakage.
2, thickness: according to the "pipe anti-corrosion layer thickness non-destructive measurement method (magnetic method)" SY0066 to measure. One for every 20 spot checks, one random measurement, each in the direction of the circumference a约四点均匀分布;当厚度不合格时，应加倍抽查，仍不合格，则判定为不合格。
3, peeling strength: with a knife ring to cut open 10mm wide, the length of more than 100mm polypropylene anti-corrosion cold tangled, until the tube body. Then use a spring scale and the pipe wall into a 90-degree angle to pull apart, the pull speed should not be greater than 300mm/min. The peeling strength shall comply with the provisions of Table 1.3.2 of this standard. This test should be performed after wrapping the tape 4h. Three sections should be tested per kilometer of anti-corrosion pipeline, and the number of spot checks at the filling and injury fillings shall be 1% of the filling and injury.
4, spark detection leakage: in the prefabricated plant should be root by root inspection, in the field of the pipeline to carry out a full-line inspection, filling, repair injuries should be checked one by one. The leak detector does not move faster than 0.3m/s, qualified without sparks.
a关于聚丙烯防腐冷缠带的防腐层质量标准和检验方法在上面有详细的介绍，为了延长冷缠带的防腐时间和钢管的使用寿命，有必要严格按照上面的检验方法进行防腐层检测，如果发现不合格应进行修补。修理完成后，再按上述标准进行试验，直至合格为止。