METHOD OF PROTECTION FROM CORROSION FOR WELDED PART OF PLASTIC LINED STEEL PIPE AND FIXING TAPE WITH PRESSURE-SENSITIVE ADHESIVE FOR CORROSION PREVENTING HEAT-SHRINK SHEET Russian patent published in 2018 - IPC F16L58/10 

FIELD: technological processes.

SUBSTANCE: method of corrosion protection for welded part, in which an anticorrosion treatment is applied to welded part of the plastic lined steel pipe by using a corrosion preventive shrink sheet including: step of fixing the end part of the sheet wound around the peripheral surface of at least welded part, by using a fixing tape with a pressure-sensitive adhesive for sheet, having a pressure-sensitive adhesive, in which the shear force at a temperature, at which the sheet shrink force becomes maximum, is greater than the maximum shrink force, and also the step of heat shrinking of the sheet and fixing tape with a pressure-sensitive adhesive for the corrosion-preventing shrink sheet, which has a layer of pressure-sensitive adhesive comprising a pressure-sensitive cross-linkable adhesive, crosslinkable by heating on one side of the heat-resistant base film and in which the shear force of the adhesive at a temperature, at which the shrink force of the sheet becomes maximum, is greater than the maximum shrink force.

EFFECT: method of protection against corrosion is proposed.

10 cl, 7 dwg