Above Ground Storage Tank Inspection According to API 653 Standard
Introduction
Above Ground Storage Tanks (ASTs) are critical components in the storage of petroleum, chemicals, and other hazardous materials. Over time, these tanks are exposed to environmental, chemical, and operational stress, which can lead to corrosion, leakage, or structural failure. To ensure safety, environmental compliance, and operational efficiency, regular inspections as per API 653 are essential.
What is API 653 Inspection?
API 653 is the inspection code developed by the American Petroleum Institute for the maintenance, inspection, alteration, and repair of above ground storage tanks. This standard applies to steel storage tanks built to API 650 or API 12C standards and focuses on:
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Structural integrity
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Tank bottom corrosion
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Shell and roof conditions
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Weld inspections
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Settlement or foundation issues
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Compliance with original design and safety regulations
Scope of API 653 Inspection Services
Our API 653-certified inspectors provide comprehensive assessments that include:
1. Visual Inspection
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Tank shell, roof, and bottom inspection for corrosion, deformation, or cracking
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Manways, nozzles, and welded connections
2. Ultrasonic Thickness Testing (UTT)
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Wall thickness measurement to detect corrosion and remaining life of tank components
3. Magnetic Particle Testing (MT) & Dye Penetrant Testing (PT)
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Detect surface and near-surface cracks on weld seams and structural areas
4. Settlement Survey
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Evaluation of tank foundation, tilting, and differential settlement
5. Bottom Plate Inspection
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Internal corrosion check using UT, Vacuum Box Testing, and MFL if applicable
6. Out-of-Service & In-Service Inspections
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Tailored inspection depending on operational status of the tank
Why API 653 Inspection Is Critical
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✅ Safety: Prevent catastrophic failures and hazardous spills
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✅ Regulatory Compliance: Meet legal requirements from OSHA, EPA, and local authorities
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✅ Extend Equipment Life: Early detection helps reduce repair costs and extend asset life
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✅ Risk-Based Inspection Planning: API 653 integrates with RBI to prioritize maintenance schedules
Inspection Interval Guidelines
| Tank Risk Level | Initial Inspection | Routine Inspection | Internal Inspection |
|---|---|---|---|
| High Risk | Within 5 years | Every 5 years | Every 10 years |
| Medium Risk | Within 10 years | Every 10 years | Every 20 years |
| Low Risk | Within 20 years | Every 15–20 years | Every 20–25 years |
(Intervals may vary based on tank age, condition, contents, and location.)
API 653 Inspection Report Deliverables
After inspection, our clients receive a detailed report including:
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Inspection findings and photographs
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Corrosion rate and remaining life calculations
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Repair recommendations (if any)
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Next inspection schedule
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Certification by an API 653-certified inspector
Why Choose Us?
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✅ Certified API 653 Inspectors
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✅ Advanced NDT Tools (MFL, UT, AE)
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✅ Digital Reporting System
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✅ Customized Inspection Plans
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✅ Experience with Petrochemical, Refinery, and Terminal Facilities
Contact Us Today for API 653 Tank Inspection Services
📞 (855) 16 557 945
📧 sorphea@khmerndt.com | info@khmerndt.com
🌐 Visit our website to request a quote or inspection plan
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