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

FIELD: construction.

SUBSTANCE: method comprises placing the heat-shrinkable sleeve made from sewn translucent plastics, over one of the jacket pipes of the abutting pre-insulated pipes, and applying an adhesive material having a colour different from the colour of the jacket pipe, to the outer surface of the both jacket pipes. After welding the abutting internal working pipes, the sleeve is moved onto the second jacket pipe and heated, providing heat shrinkage and the formation of the adhesive compound, and after heat shrinking and forming the compound "sleeve-jacket pipes", the cavity between the butts of the insulation layers, the working pipes and the sleeve is filled with the foaming composition. Visual inspection of forming the permanent junction of the sleeve and the jacket pipes is performed by means of the sleeve of the sewn translucent plastic.

EFFECT: provision of hydraulic and mechanical protection of insulation in the permanent butt joints of piping systems.

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