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Sampling for Internal Corrosion

By Chemical Engineering |

Properly selected and executed sampling techniques are essential for assessing, controlling and mitigating internal corrosion of pipes and other assets in the chemical process industries (CPI). Key data for evaluating an asset or piping system for internal corrosion include the following: materials of construction, properties of fluids carried, operating conditions and valid analytical data from proper sampling. This reference describes considerations for sampling of internal corrosion. Sampling methods Internal corrosion sampling consists of several overlapping evaluation methods — some performed with the system operating normally and others performed with the equipment operated to facilitate the test method. Widely used methods for assessing internal corrosion include the following: Bacterial analysis Coupons and probes Deposit analysis Gas samples Liquid samples Inline inspections These sampling methods can be used independently, or in combination, to determine the extent and suspected causes of internal corrosion. This information can then help determine whether mitigating methods are necessary, as well as whether or not the mitigation measures were successful. Common potential causes of internal corrosion include…
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