Citadel Engineering Company is a full-service inspection, maintenance and repair company that provides a wide range of services to the oil and gas industry. We offer tank inspections, tank cleaning, corrosion control, tank lining and other services to help our clients keep their facilities running smoothly. Our storage tank inspections cover both in- and out-of-service inspections of vertical and horizontal bulk storage tanks, both above and below ground. A combination of techniques is used to provide a comprehensive storage tank inspection, reporting on the overall condition of tank floors, shells, roofs and structures. The inspection reports include engineering calculations in accordance with API 653 & 650 and other relevant specifications.