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This standard presents methods and practices for achieving effective control of external corrosion on underground or submerged metallic piping systems and is intended for use by corrosion control personnel concerned with piping used for the transport of oil, gas, water, and other fluids. It is applicable to underground structures and piping buried on land, or submerged in water bodies such as lakes, rivers, bayous, and creeks.
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Keywords: submerged metallic piping, underground, external corrosion, anode, cathodic protection, coatings
This standard presents standard practices for effective control of external corrosion of underground storage tank (UST) systems by cathodic protection (CP). It is intended to be used by corrosion professionals as a guideline to establish minimum requirements for using CP to control external corrosion of metallic UST systems, including those used to contain oil, gas, and water.
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This guide covers and describes the factors that influence laboratory immersion corrosion tests, particularly mass loss tests. These factors include apparatus, sampling, test specimen, test conditions (test solution composition, temperature, gas sparging, fluid motion, solution volume, method of supporting test specimens, duration of test), methods of cleaning test specimens, imterpretation of results, and calulation of corrosion rates. This guide also emplasizes the importance of recording all pertinent data and provides a checklist for reporting test data.