This new Quick Guide reviews one of API's three main Individual Certification Programs (ICPs): API 653: Certified storage tank inspector; Discusses key definitions and scope, inspection regimes and testing techniques relating to tank design, linings, welds, protection systems, and alteration; Provides an important resource for these API programs, which are well established in the oil/gas/petroleum industries. API runs multiple examination sites around the world at 6-month intervals. The three main ICPs are: API 570: Certified Pipework Inspector; API 510: Certified Pressure Vessel Inspector; API 653: Certified Storage Tank Inspector. Co-published with Woodhead Publishing (UK).