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Compatibility Analysis of Regional CP System and Electrical Grounding System in Oil/Gas Stations

cathodic protection, electrical grounding, oil/gas stations, numerical simulation
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Numerical simulation was used to calculate the potential and current distribution for cases with: (1) electrical isolation between grounding system and CP system; (2) different electrical grounding materials; (3) Optimization of anode beds (near/remote); (4) isolation of partial grounding electrodes.

Product Number: 51317--9254-SG
ISBN: 9254 2017 CP
Author: Liang Dong
Publication Date: 2017
Industry: Cathodic Protection
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$20.00
$20.00

Regional cathodic protection (CP) system is used to protect buried facilities in oil/gas stations from corrosion caused by soil and electrical grounding system with electropositive materials. However the required current may increase tens to hundreds of times due to the existing electrical grounding materials and extremely heterogeneous protected potential distribution on buried facilities may occur. Electrical isolation from grounding system with direct current decoupler is theoretically feasible but not practical because of excessive connection points. To analyze and improve the compatibility of regional cathodic protection system and electrical grounding system in oil/gas stations numerical simulation was used to calculate the potential and current distribution based on different cases with: (1) near/remote anode beds; (2) different electrical grounding materials; (3) local insulation. The results showed that the lower spacing including intersection between buried facilities and grounding structures were the main cause. Local insulation in these locations and optical design of anode beds with numerical simulation technique could improve the CP effects. Moreover using zinc anodes as electrical grounding materials may be a good choice in some situations.

Key words: cathodic protection, electrical grounding, oil/gas stations, numerical simulation

Regional cathodic protection (CP) system is used to protect buried facilities in oil/gas stations from corrosion caused by soil and electrical grounding system with electropositive materials. However the required current may increase tens to hundreds of times due to the existing electrical grounding materials and extremely heterogeneous protected potential distribution on buried facilities may occur. Electrical isolation from grounding system with direct current decoupler is theoretically feasible but not practical because of excessive connection points. To analyze and improve the compatibility of regional cathodic protection system and electrical grounding system in oil/gas stations numerical simulation was used to calculate the potential and current distribution based on different cases with: (1) near/remote anode beds; (2) different electrical grounding materials; (3) local insulation. The results showed that the lower spacing including intersection between buried facilities and grounding structures were the main cause. Local insulation in these locations and optical design of anode beds with numerical simulation technique could improve the CP effects. Moreover using zinc anodes as electrical grounding materials may be a good choice in some situations.

Key words: cathodic protection, electrical grounding, oil/gas stations, numerical simulation

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