Materials Performance

JUN 2016

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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34 JUNE 2016 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 55, NO. 6 resistivity conditions local to a pipeline or other metal structure in contact with soil must be estimated reliably. These numbers also tell a lot about soil ion content. In addition, the degree of moisture-wetting in soils should be understood, and virtually no soil condition should be considered to be completely dry. Many other study results identify the aggressiveness of chloride ions in the exter- nal corrosion of steel. Any time salinity is found in soils, chloride ions will be detri- mental to steel structures. Study of regional geologic publications may lead to better anode bed design and installation. References 1 USDA Web Soil Survey, http://websoilsurvey (May 3, 2016). 2 A.W. Peabody, Peabody's Control of Pipeline Corrosion , 2nd Ed . (Houston , TX: NACE International, 2001). 3 U SD A Natural Re s ourc e s C on ser vation Ser vice, "A Soil Profile," http://www.nrcs. u s d a . g o v / w p s / p o r t a l / n rc s / d e t a i l / s o i l s / edu/?cid=nrcs142p2_054308 (May 3, 2016). 4 C o l o r a d o S t a t e Un i v e r s i t y E x t e n s i o n , "Managing Soil Tilth: Texture, Structure, and Pore Space," mg/gardennotes/213.html (May 3, 2016). 5 University of Queensland , Australia, Soil Sciences, Science_Lessons/Soils.html (May 3, 2016). CAL CHAPMAN is president of Chapman Engineering, Inc., PO Box 1305, Boerne, TX 78006, e-mail: cchapman@chapman. engineering. He provides environmental and corrosion engineering services as a licensed engineer in four states, is a Model Law Engineer through the National Council of Examiners for Engineering Surveying, and is a NACE International Cathodic Protection Specialist. He co-authored the June 2015 Pipeline & Gas Journal article, "Oil/Gas Operators: Managing Risk When Energy Prices are Down." He has been a member of NACE since 1998. NACE CORROSION CAREER AND SALARY SURVEY RESULTS COMING NEXT MONTH! CATHODIC PROTECTION

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