An API 653 job involves the inspection, repair, alteration, and reconstruction of aboveground storage tanks in accordance with API Standard 653. API 653 inspectors ensure tanks remain safe, compliant, and operational by conducting evaluations, recommending repairs, and verifying adherence to industry standards. These professionals typically work in industries such as oil and gas, chemical processing, and power generation. Certification through the API 653 program requires experience, passing an exam, and knowledge of tank design, inspection practices, and repair procedures.