Inspection 6 min read
API 653 Storage Tank Inspection: A Practical Guide
What an API 653 inspection covers — floor MFL, shell UT, roof and settlement — and when it's due.
API 653 governs inspection, repair, alteration and reconstruction of above-ground storage tanks. An inspection program splits into in-service external checks and out-of-service internal inspection.
The internal scope typically includes magnetic flux leakage (MFL) scanning of the floor to find under-side corrosion, ultrasonic thickness of shell courses, roof condition and a settlement survey of the foundation. Findings drive repair scope, re-rating and the next inspection interval. TESKO delivers the full API 653 scope under one contract.