METHOD OF CLEANING TUBINGS FROM ASPHALT-RESIN-WAX ACCUMULATIONS Russian patent published in 1998 - IPC

FIELD: cleaning of tubings from asphalt-resin-wax accumulations. SUBSTANCE: method includes supplying to exterior surface of tubing of working medium from main pipeline through distributing gate, simultaneous heating of tubing over its entire length and perimeter; ceasing of supply of working medium to exterior surface of tubing upon obtaining the temperature of heating equalling the temperature of minimal adhesion of asphalt-resin-wax accumulations to metal of the interior surface of tubing; fastening hermetically to one end of tubing of plug with flexible pipeline installed in plug and supplying of working medium to interior surface of tubing through flexible pipeline. Introduced additionally to flow of working medium may be chemical reagent for removal of accumulations. In this case, reagent may be introduced into flow of working medium for cleaning of exterior and/or interior surface of tubing. EFFECT: higher efficiency. 3 cl, 1 dwg