Effectiveness criterion and residual life prediction method of sacrificial anode and cathode protection system

A sacrificial anode and cathodic protection technology, applied in the field of the remaining life of sacrificial anodes, to eliminate errors and avoid waste of resources

Active Publication Date: 2014-09-24
BEIJING GAS GRP +2
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Problems solved by technology

As for the cathodic protection system that has been in service, whether it can effectively operate to its design lif

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  • Effectiveness criterion and residual life prediction method of sacrificial anode and cathode protection system
  • Effectiveness criterion and residual life prediction method of sacrificial anode and cathode protection system
  • Effectiveness criterion and residual life prediction method of sacrificial anode and cathode protection system

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[0040] (1) Design a sacrificial anode cathodic protection system for buried pipelines. The length L of the protected steel pipe is 2000m, and the inner diameter is d p is 10.16cm, the outer diameter D is 51cm, the buried depth of the pipeline is 1m, the anti-corrosion coating is asphalt glass cloth, the required protection current density i is 0.03mA / m2, and the most positive polarization potential of the pipeline is -850mV (CSE), The soil resistivity is 40Ω·m;

[0041] (2) Choose a magnesium alloy sacrificial anode. The anode group is laid at the midpoint of the pipeline. There are 2 anodes in the group. The specifications of the magnesium anode: the mass m is 14.5kg, the length l is 70cm, and the equivalent diameter d is 13.4cm; Set up a negative protection test pile here;

[0042] (3) Use the formula (1) to calculate the minimum protection current I required by the pipeline 0 48.04mA, the minimum output current I of sacrificial anode group z min = I 0 , the minimum outp...

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Abstract

The invention discloses an effectiveness criterion and residual life prediction method of a sacrificial anode and cathode protection system. According to the invention, the effectiveness criterion takes a sacrificial anode critical ground resistance as an evaluation index to perform effectiveness evaluation on a whole group of sacrificial anodes in the sacrificial anode and cathode protection system, if yes, the residual life of the system is calculated. The residual life prediction method can be used for obtaining the allowable minimal mass of the anodes, the residual mass of serving anodes and average output current through measurement and calculation so as to obtain the residual life of the sacrificial anodes. Compared with a traditional cathode protection effectiveness evaluation method, the sacrificial anode critical ground resistance is introduced in the effectiveness criterion for the first time to be taken as the cathode protection effectiveness evaluation index so that the cathode effectiveness evaluation method is more systematic and comprehensive; meanwhile, the invention also provides a simple and effective residual life prediction method for cathode protection engineering.

Description

field of invention [0001] The present invention relates to the technical field of sacrificial anode cathodic protection, in particular to the effectiveness of the buried metal pipeline sacrificial anode cathodic protection system and the remaining life of the sacrificial anode. Ensure the remaining life of the sacrificial anode in the system and improve the safety of the pipeline. Background technique [0002] Sacrificial anode cathodic protection technology has been widely used in the anticorrosion of urban buried metal pipelines as a cost-effective anticorrosion method. Since sacrificial cathodic protection was adopted for buried pipelines, the earliest sacrificial anodes have approached the design life of the cathodic protection system. Whether these sacrificial anodes can continue to protect the pipelines, whether the cathodic protection system is still effective, and if so, what is the remaining life of the cathodic protection system? Issues that pipeline anticorrosi...

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Application Information

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IPC IPC(8): C23F13/04
Inventor 李夏喜杜艳霞高顺利路民旭邢琳琳高佳伟赵欣唐德志张辉
Owner BEIJING GAS GRP
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