Determination of the priority of withdrawal to repair of equipment of anti-corrosive protection on the section of the gas pipeline in the conditions of restriction of financing

Issue 25(2) 2020
Pages 7-17

S.V. Sabanov, JSC «Giprogascentr», Nizhniy Novgorod, Russian Federation

S.A. Nikulin, JSC «Gipro-gascentr», Nizhniy Novgorod, Russian Federation

E.L. Karnavskiy, JSC «Giprogascentr», Nizhniy Novgorod, Russian Federation


Keywords: the main gas pipeline, anti-corrosion protection equipment, priority of withdrawal to repair

http://www.doi.org/10.31615/j.corros.prot.2020.96.2-1

 

Based on the experience of the operating organizations and results of previous studies, it is determined, that the more rational criterion for the withdrawal in the repair of insulation coating on the section of the pipeline is the reserve of the current from the nominal value, and the criterion of withdrawal in the repair of anode grounding is a reserve of voltage from the nominal value. It has been revealed that with data on changes in the output parameters of the cathode protection station and protection potential at the control point for a certain period, it is possible to predict the change in the factor of influence of the station at this point for a certain period and, therefore, to predict changes in the modes of operation of this station and the technical condition of the anti-corrosion protection system at the specified required range of maintenance level of protective potential. Based on the above conclusions, algorithms have been developed to assess the residual resource of the anti-corrosion protection system on the gas pipeline site and make management decisions on its extension based on the received values in the conditions funding restrictions. Also, an algorithm has been developed to determine the residual resource of the anti-corrosion protection system with the most effective redistribution of parameters between the cathode protection stations and an algorithm that allows to determine the priority of output in the repair of the system elements.