NACE SP21469-2021, “Corrosion Inhibition Selection and Management for Oil and Gas Production,” was approved on March 26, 2021 and is now available in the AMPP Store. This Standard Practice aims to provide guidance for the selection and application of corrosion inhibitors for upstream oil and gas process conditions exposed to corrosive environments.
The application of effective corrosion inhibitors in oil and gas production is essential to enable long-term use of carbon steel in corrosive production environments. These products can be applied continuously or on a batch basis. The effectiveness of corrosion inhibitors that are applied has to be assured for the range of conditions associated with the application and lifetime of the facility. The assurance is predominantly achieved through laboratory testing. However, field evaluation of these products can be a significant part of the assurance process.
Meanwhile, the NACE/ASTM standard, “Standard Guide for Laboratory Immersion Corrosion Testing of Metals,” has been revised and was published in February 2021. This guide covers and describes the factors that influence laboratory immersion corrosion tests, particularly mass loss tests. These factors include apparatus, sampling, test specimens, 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, interpretation of results, and calculation of corrosion rates.
This guide also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. The specific evaluation of localized attack, environmentally assisted cracking, and the effects of solution flow are not within the scope of this guide. This guide is intended to be used by those designing laboratory immersion tests who may not be familiar with all of the variables to consider and the pitfalls that could be encountered when designing and conducting this kind of testing.
It should be used as a reference to ensure that the test will allow the generation of data relevant to the application with the minimum of interferences. The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.
To access all NACE standards and reports, visit store.ampp.org.