METHOD OF CONSTRUCTION OF PIPINGS FOR CONVEYANCE OF PETROLEUM AND/OR LIQUID PETROLEUM PRODUCTS, AND/OR GAS CONDENSATES, AND METHOD OF THEIR USE, REPAIR, AND/OR RECONSTRUCTION, AND/OR RESTORATION OF PIPINGS FOR CONVEYANCE OF PETROLEUM, AND/OR LIQUID PETROLEUM PRODUCTS, AND/OR GAS CONDENSATES Russian patent published in 1996 - IPC

FIELD: construction, use and repair of pipings. SUBSTANCE: at construction of pipings for conveyance of petroleum, liquid petroleum products and gas condensates, their repair and use an anode earth rod, comparison electrode and auxiliary electrode are buries near metal-containing objects. The values of potentials are measured at the object to be protected, comparison electrode and auxiliary electrode, and the former of protective potentials at the converter substation produces the necessary difference of potentials between the object to be protected and anode earth rod. EFFECT: enhanced reliability. 92 cl, 15 dwg