Atmospheric Storage Tanks (ASTs) are significant and common equipment items in the oil, chemical and transportation industry. ASTs are often used to store very large amounts of inventory, mostly flammable liquids and sometimes toxic liquids. Their content might be kept under atmospheric temperature and pressure but can also sometimes be refrigerated. The hazards from ASTs can be serious given the large amounts of liquid. This paper will explore the risk based inspection (RBI) approach for inspections of ASTs, scenarios and results.