METHOD OF APPLICATION OF COATING ONTO INNER SURFACE OF PIPELINE Russian patent published in 2000 - IPC

FIELD: public utilities, oil, gas and other industries; protection of pipeline inner surfaces. SUBSTANCE: method comes to introduction of single-layer or multilayer lining into pipe line. Ends of lining layers are turned inside out and secured over perimeter on outer surface of pipe line end. Lining is pressed to pipe line surface owing to creation of pressure differences. Lining is made of cloth or film web by turning the web into spiral in direction square to its long side and is driven into pipeline under vacuum built at opposite end of pipeline. Two toruses are used to introduce, move and press lining to pipe line surface. One torus, whose outer diameter is less than inner diameter of pipe line and which is filled with gas, is used to straighten out lining relative to inner surface of pipeline. Foregoing torus, with outer diameter equal to inner diameter of pipeline and which is filled with gas or liquid, is used to pull and roll down lining to surface of pipeline. Description of invention provides formulas for determining width of web, width of side overlapping and diameter of torus straightening out lining. EFFECT: improved reliability and quality of coating. 2 cl, 3 dwg