FUSION WELDER Russian patent published in 2003 - IPC

FIELD: civil engineering. SUBSTANCE: invention can be used in laying of plastic pipes. According to invention ends of pipes to be connected are tightly fitted in sleeve which contains built-in heating spirals made of high- resistance wire of filaments which provide, when being energized, fusion welding of sleeve material with material of pipe walls in places where spirals are located. Diameter of ends of sleeve is greater than diameter of its intermediate part which permits driving of outer pipe with tight fitting. Inner diameter of intermediate part is made to provide possibility of driving in inner pipe of pipeline also with tight fitting. Said pipeline contains two coaxial pipes and space in between to reveal leaks. Sleeve contains at least one channel which connects interpipe space at both sides of intermediate part of sleeve. EFFECT: simplified mounting, increased reliability of connection. 8 cl, 4 dwg