The ASME Section VIII pressure vessel code covers design and fabrication of new equipment. Once a vessel is installed and placed into service, it no longer governs. The American Petroleum Institute (API) 510 code addresses vessels after that are in service. It covers inspections of vessels, including what types of testing should be done, and how often. It includes guidance on evaluation of corroded, pitted, or damaged areas. The code also covers repairs, re-ratings, and alterations of vessels. Inspection information and thickness measurements can be used to determine corrosion rates and expected remaining life of vessels. API also offers an inspector certification program for API-510. To qualify for certification, inspectors must meet experience requirements and pass a test relating to all aspects of vessel inspection and evaluation. Contact Ward for any questions about API-510, or inspections and repairs of in-service vessels.