FIELD: petroleum industry; repair and defectoscopy of pipes of a petroleum assortment.
SUBSTANCE: the invention is deal the field of repair and defectoscopy of pipes of a petroleum assortment and may be used in petroleum industry. The method includes preparation of a cleaning material, its boost up to a preset speed and feed of a jet to the treated surface. In the capacity of cleaning material changing the physical state in process of its contact with a treated surface. For treatment and hardening of a surface use liquid nitrogen compressed up to 16 pressure units, and a jet is formed of 150 up to 1000 m/s. The method is pollution-free and ensures improvement of the quality of clearing.
EFFECT: the invention ensures improvement of the quality of clearing.
3 cl, 4 ex
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