METHOD OF APPLYING COAT ON INNER SURFACE OF PIPE LINE Russian patent published in 1999 - IPC

FIELD: methods of repair of pipe lines laid under ground and above its surface; repair of sewage systems, in particular. SUBSTANCE: combination hose made from composite material is introduced into pipe line, pressed to inner surface of pipe line under action of pressure of heat-transfer agent and is polymerized. Auxiliary hose is preliminarily placed inside combination hoes; additional hose is filled with gaseous mixture after introducing it in pipe line; upon completion of polymerization, this hose is withdrawn from pipe line. EFFECT: enhanced reliability of coat. 9 cl, 2 dwg