METHOD FOR SEALING JOINTS OF PRE-INSULATED PIPES Russian patent published in 2017 - IPC F16L13/00 

FIELD: construction.

SUBSTANCE: method consists of placing a heat-shrinkable sleeve made from sewn translucent plastic over one of the jacket pipes of the abutting pre-insulated pipes, adding adhesive material of a colour different from the colour of the jacket pipes, or on the inner surface of the sleeve and installing embedded heating elements of a colour different from the colour of the jacket pipe on the outer surface of both jacket pipes. After welding the abutting internal working pipes, the sleeve is moved to the second jacket pipe and heated, providing heat shrinkage and the formation of the adhesive compound, or, by means of embedded heating elements, and after heat shrinking and forming the compound "sleeve-jacket pipe", the cavity between the butts of the insulation layers, the working pipes and the sleeve is filled with the foaming composition. The visual inspection of forming of the permanent junction between the sleeve and the jacket pipes is performed through the sleeve made of sewn translucent plastic.

EFFECT: provision of hydraulic and mechanical protection of insulation in the permanent butt joints of piping systems, eg in heat- and water-insulated piping systems.

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