METHOD OF MANUFACTURE OF SCREENS TO PROTECT PIPELINES FROM ELECTROCHEMICAL ACTION Russian patent published in 2002 - IPC

FIELD: construction; protection of pipelines from stray currents. SUBSTANCE: according to said method, two layers of insulation made of silicon foamed concrete and foamed polyurethane in form of "shells" are applied to pipe, and then pipe is covered with aluminium foil which is secured by bands in 10-50 m steps, with grounding of bands. Aluminium foil tape in form of spiral covering from outside all pipe insulation is glued between first inner layer and outer foamed polyurethane layer using foamed polymer solution. Ends of tape are brought out in places of pipe butt joints over entire length of pipeline and are electrically connected to bands. Description of invention contains recommendations on thickness of tape and its winding on. EFFECT: improved reliability of pipeline.