METHOD OF CONNECTING PIPES HAVING INNER COAT Russian patent published in 2004 - IPC

FIELD: pipe line transport; erection of pipe lines provided with inner corrosion-resistant coat. SUBSTANCE: inner diameter of ends of pipes is calibrated and extended prior to application of coat and inner protective bush is placed in joint area; said bush is provided with corrosion-resistant coat and sealing members on outer surface; in center of this bush there is ring made from heat-insulating material. Sealing members are placed in zones of change of inner diameter of pipe ends; outer surface of sealing members corresponds to configuration of inner surface of pipes in said zones and longitudinal mounting size of bush exceeds respective size of extended ends of pipes. Sealing members are made in form of radial circular projections of bush with rings made from elasto-flexible material. EFFECT: enhanced reliability. 6 cl, 4 dwg