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08051 Evaluation of Sacrificial Anode Backfill Material

Picture for 08051 Evaluation of Sacrificial Anode Backfill Material
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Product Number: 51300-08051-SG
ISBN: 08051 2008 CP
Author: Omran Abuazza, Reafat Elaish, Mr. Khalefa Enawaa, Salem Alomami, and Abdelaziz Gaderbuh
Publication Date: 2008
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A common method of corrosion control of buried pipeline is that of cathodic protection involving the use of sacrificial anodes. To ensure maximum effectiveness of an anode, a suitable backfill material of Gypsum/Bentonite is required to maintain the necessary current flow. This material is generally inert and moisture retentive. In the River Project of Libya,the bentonite used was collected from two different clay member formations.The destructive inspection of zinc anodes revealed that the backfill material used from one formation (No. 1) has dried quickly and shrunk away from the anode and the other backfill used from formation No. 2 was still moisture retentive and working properly. Therefore a laboratory tests were carried out to determine the causes of the shrinkage of formation 1 and also to identify the characteristics of Bentonite used and its suitability for use in the backfill, and how to delay the moisture content loss with minimum shrinkage.
A common method of corrosion control of buried pipeline is that of cathodic protection involving the use of sacrificial anodes. To ensure maximum effectiveness of an anode, a suitable backfill material of Gypsum/Bentonite is required to maintain the necessary current flow. This material is generally inert and moisture retentive. In the River Project of Libya,the bentonite used was collected from two different clay member formations.The destructive inspection of zinc anodes revealed that the backfill material used from one formation (No. 1) has dried quickly and shrunk away from the anode and the other backfill used from formation No. 2 was still moisture retentive and working properly. Therefore a laboratory tests were carried out to determine the causes of the shrinkage of formation 1 and also to identify the characteristics of Bentonite used and its suitability for use in the backfill, and how to delay the moisture content loss with minimum shrinkage.
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This paper contains a review of commonly used practices and presents a generalized technique for the calculation of earth potentials for the determination of remoteness of impressed current anode ground beds. The intent is to facilitate proper design and evaluation of anode ground beds of impressed current cathodic protection system for cross-country pipelines.
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