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地下埋设的输油、气管线都要在外面涂布高绝缘强度的防腐层,目前我国使用的防腐材料大都是沥青。我们测定,茂名产防腐沥青的绝缘强度在加三层玻璃丝布和不加的情况下都在30千伏/毫米以上。因此,只要防腐层不破损,不脱落,只要存在一有限薄层,就能保护钢管防止腐蚀。绝缘层破裂造成钢管部分裸露称为漏铁。漏铁处,钢管表面直接与水、土接触,发生腐蚀。若能早日发现漏铁处,及时修补防腐层,就能防止管线腐蚀穿孔。这在保证输油气管道工业安全高产方面有着重要的意义。地下管道防腐层检漏仪就是在地面上寻找防腐层破损漏铁处的仪器。
Underground buried oil and gas pipelines should be coated with high dielectric strength of the coating, the current anti-corrosion materials used in our country are mostly asphalt. We determined that the insulation strength of Maoming anti-corrosion bitumen is above 30 kV / mm with three layers of glass cloth and without addition. Therefore, as long as the coating does not break or fall off, it will protect the steel from corrosion as long as there is a finite layer of material present. Insulation rupture caused by the bare exposed pipe called leakage of iron. Leakage at the pipe surface directly with water, soil contact, corrosion occurred. If early detection of leaky iron, repair the coating in a timely manner, can prevent pipeline corrosion perforation. This is of great significance in ensuring industrial safety and high output of oil and gas pipelines. Underground pipeline anti-corrosion coating leak detector is on the ground looking for anti-corrosion coating at the damaged iron.