API 653 – Above Ground Storage Tank Inspection

Tanks built to API 650 and its predecessor API 12C that are in-service are covered by API-653. Tank foundation, bottom, shell, structure, roof, attached appurtenances, & nozzles are all required to be inspected. Inspections are required at recommended intervals to remain compliant with code and environmental regulations.

API-653 Inspections

This standard covers maintenance, inspection, alteration, and repair of specific tanks.

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Protect your storage tanks and your facility with trustworthy, reliable inspectors.

Non-Destructive Testing

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API 653

What is API 653 for Above Ground Storage Tank Inspection?

API 653 applies to above-ground storage tanks that are built to API-650 or API 12C. The standard regulates how those tanks should be maintained, inspected, repaired, or altered. Not just anyone can do an API 653 inspection – regulations require they be administered by a certified inspector.

All storage tanks deteriorate over time. If they aren’t properly maintained and monitored, it’s just a matter of time before problems can occur. Regular inspections protect your equipment, your facility, your staff, and your community from the possibility of failure. Utilizing insight from inspections to improve safety and maintenance can also improve your storage tank’s lifespan.

Equipment Covered
  • Fixed Roof
  • Internal Floating Roof
  • Open Atmosphere
Services Offered
  • Fitness for Service (FFS) Evaluations
  • Risk Based Inspection (RBI)
  • Inspection Work Plan (IWP) Development and execution
  • Formal External Inspection
  • Formal Internal Inspection
  • Floating Roof Seal Environmental Inspection
  • Ultrasonic Thickness Testing (UTT)
  • Automated Ultrasonic Thickness Testing (AUT)
  • Settlement Survey
  • Verticality Assessment
  • Corrosion Mapping
  • MFL Floor scan Inspection
  • Monthly and Annual Checklist Inspections
  • Leak Testing
  • Leak detection
  • Seal inspection
  • Post repair
  • Dike Survey
  • Spill Prevention Control and Countermeasure (SPCC) Plan Development and Review
  • Corrosion rate and remaining life evaluations


Every facility, organization, or agency has unique needs when it comes to inspections. We’ve answered a few of the most common questions about above ground storage tank inspection here, but our experts are eager to help if you have more.

What are the components of an above ground storage tank inspection?

API 653 inspection involves reviewing storage tank inspection history, specifications, the tank’s construction, spill control, and release detection protocols. Our inspector examines all elements of the tank bottom, shell, and roof. We’ll also conduct a settlement evaluation to check how the tank rests or settles into the ground.

How do you examine above ground tank components?

Our experts use a range of inspection methods including visual, ultrasonic, liquid penetrant, magnetic particle, X-ray, MFL and other non-destructive testing.

What happens after an above ground tank inspection API 653?

Our certified experts will provide you with reports on our findings that include needed repairs, a suggested follow-up inspection schedule, and any adjustments recommended on your tank’s maximum fill height.

How do I avoid regulation-related penalties and fines?

Obtain and document a formal inspection schedule for internal and external storage tank inspections. Work with one of our experts to ensure safety and compliance.

Why choose InServe for API 653 Above Ground Storage Tank Inspections?

Our inspectors are American Petroleum Institute 653 certified, so we have the knowledge and experience to conduct required inspections with minimal downtime. We stay up to date on all state tank inspection requirements, and we can help ensure your tank is safe, reliable, and ready for continued service.

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