FIELD: transportation pipe lines and pipe lines fittings for tubes made from different materials. SUBSTANCE: permanent joint consists of polyethylene pipe, steel pipe and sleeve mounted on outer surface of working portion of polyethylene pipe embracing the working portion of steel pipe; working portion of polyethylene pipe is made in form of bell mouth. length of sleeve exceeds length of working portion of pipes. Ends of sleeve extend beyond working portion of pipes. Sleeve is made from polyethylene whose linear expansion coefficient is equal to that of polyethylene pipe. EFFECT: enhanced reliability of joint. 6 cl, 1 dwg
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