FIELD: oil and gas industry.
SUBSTANCE: marker consists of two marking straps made of ferromagnetic material and namely of pre-magnetised compound material with high plasticity properties; the straps are installed on top of a pipeline at a certain gap between them. The marker contains marks with reference index. The straps are fixed due to magnet forces interaction between the strap and steel pipe and the mark with reference index is placed to the ground when the pipeline is covered by earth.
EFFECT: reducing weight of the marker and labour intensity of its installation, improving mounting quality and reliability of its operation.
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