APPARATUS FOR APPLYING PROTECTIVE COATING ONTO INNER SURFACE OF PIPELINE Russian patent published in 2003 - IPC

FIELD: building and exploitation of pipeline systems, possibly restoration and protection of inner surface of pipelines against corrosion. SUBSTANCE: apparatus includes tore-like members filled with working agent, mounted in pipeline with axial gap and having elastic inner gas-tight envelope and protective outer cloth cover. Tore-like members are arranged between two supporting discs having concentric systems of rollers on detachable racks and they are mutually joined by means of flexible link passing through their cavities and through axial gap. Union is passed through supporting disc being first along motion direction of apparatus. One end of union having shutoff valve is connected with flexible supply hose; its opposite end is connected with feed pipe passed through cavity of front tore-like member together with flexible link in the same hose of elastic material. Anchor ring of driving supporting disc is joined with flexible steel tie rod. EFFECT: possibility for controlled feed of working fluid to axial gap in quantity strictly corresponding to length of pipeline and with minimized losses caused by possible flaws, reliable movement of tore-like members along straight and curvilinear portions of pipeline. 5 dwg