PROCEDURE FOR MONITORING CORROSION OF MAIN WITH DEVICE OF CATHODE PROTECTION Russian patent published in 2011 - IPC F17D3/00 

FIELD: machine building.

SUBSTANCE: procedure consists in measurement of values of protection potentials U_n of pipeline relative to corresponding reference electrodes in n control points along pipeline at specified space step. On base of these values there is determined condition of corrosion in the main. Also, values of protection potentials U_n in a controlled section of the pipeline are measured m times, where m≥10 in each control point n in specified time interval, with successive determination of histograms of distribution of measured values U_n in each control point n. Further, using plotted histograms, there is determined percent ratio ε_n of values of protection potential to common number m of performed measurements for values U_n. There are plotted histograms of per cent ratios ε_n for each point n. There are established values ε_n beyond the specified interval (U_hn…U_ln) of allowed values, where U_hn and U_ln are high and low allowed values of the specified interval of allowed values in point n. If value ε_n exceeds specified threshold value ε_thresh in any control point, there is diagnosed presence of corrosion danger of the main in the given control point.

EFFECT: increased reliability of control of corrosiveness in places of main contiguity.

8 cl, 2 dwg