FIELD: oil and gas industry.
SUBSTANCE: invention refers to processes of shot blasting treatment of parts and metal structures, particularly to the methods applied for cleaning and strengthening oil and gas main lines by means of self-propelled trass machinery. Treatment is performed with nozzles producing shot blast circulating by means of compressed air. Treatment is carried out with turned off line feed during oscillating motion of nozzles. When shot blast is set off to the boundary of treated section at a distance equal to a step of oscillating motion, oscillating motion of nozzles is turned off and line feed of nozzles is turned on. Line feed of nozzles is performed at rate equal to oscillating rate of nozzles.
EFFECT: increased efficiency.
3 dwg, 1 ex
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