METHOD OF LINING METALLIC TUBE BY PLASTIC ENVELOPE Russian patent published in 1997 - IPC

FIELD: production of pipelines for pipeline transportation systems. SUBSTANCE: method comprises steps of inserting plastic envelope inside metallic tube; fastening said envelope by means of jamming rings; expanding end portions of metallic tube by value no less than doubled thickness of said jamming rings; placing said jamming rings in zones of expanded tube ends when plastic envelope is inside tube; expanding jamming rings together with plastic envelope and metallic tube until their final mutual joining and securing one to another; finally sizing end portions of metallic tube; additionally flaring one of expanded end portions of tube. EFFECT: enhanced efficiency. 2 cl, 2 dwg