Internal Tank Assessment
Professional API 653 tank inspection services
API 653 Tank Inspection
Professional aboveground storage tank inspection, repair, and reconstruction services following API 653 standards. Our certified inspectors ensure comprehensive compliance with industry requirements.
What is API 653?
API 653 is a standard from the American Petroleum Institute (API) that covers the inspection, repair, alteration, and reconstruction of aboveground storage tanks (ASTs) built to API 650 or API 12C. Our experienced team specializes in these critical standards.
It ensures that tanks storing petroleum products, chemicals, and other liquids remain safe, reliable, and compliant throughout their service life. Combined with NDT techniques, API 653 provides comprehensive asset integrity management.
Key Scope of API 653
Comprehensive standards covering all aspects of tank maintenance and safety
Inspection Requirements
External inspections – Every 5 years (or sooner if required).
Internal inspections – Typically every 10 years, but can vary based on corrosion rates and service conditions.
In-service inspections – Routine visual checks by certified personnel.
Tank Evaluation
Shell thickness calculations.
Floor and roof corrosion assessment.
Settlement and foundation evaluations.
Repairs & Alterations
Welding and shell repairs.
Bottom replacements.
Nozzle additions or relocations.
Reconstruction & Certification
Rules for dismantling, relocating, and reassembling tanks.
Work must be performed or overseen by an API 653 certified inspector.
Why It Matters
API 653 compliance is essential for safe, reliable, and legally compliant tank operations
Regulatory Compliance
Ensures compliance with API, EPA, OSHA, state, and local regulations.
Risk Prevention
Prevents tank failures, leaks, and costly environmental incidents.
Asset Protection
Extends service life of tanks while reducing operational downtime.
Safety Protection
Protects workers, communities, and the environment from hazards.
Frequently Asked Questions
Common questions about API 653 services
API 653 applies to aboveground storage tanks (ASTs) that were originally constructed to API 650 or API 12C standards. This includes tanks storing petroleum products, chemicals, and other liquids in refineries, chemical plants, and tank farms. The standard covers tanks with capacities typically ranging from 1,000 to several million gallons.
External inspections are required at least every 5 years, while internal inspections are typically required every 10 years, though intervals can vary based on corrosion rates, service conditions, and tank risk assessment. In-service inspections should be performed routinely by qualified personnel to monitor tank condition between formal inspections.
Some repairs can be performed while tanks remain in service, such as external shell repairs, nozzle modifications, and certain welding operations, provided proper safety procedures are followed. However, major repairs like bottom replacements or significant alterations typically require the tank to be taken out of service and properly cleaned.
If a tank fails inspection, it must be repaired, altered, or taken out of service until it meets API 653 requirements. The inspector will document all deficiencies and recommend appropriate corrective actions. Repairs must be performed using approved procedures and materials, and the tank must pass re-inspection before returning to service.
API 653 inspections must be performed by certified API 653 tank inspectors who have passed the API examination and meet experience requirements. These inspectors must maintain their certification through continuing education and recertification every three years. Only authorized inspectors can approve tank repairs, alterations, and fitness-for-service determinations.
Need Professional API 653 Services?
Our certified API 653 professionals use advanced techniques to ensure your assets remain safe, reliable, and compliant without interrupting operations. Learn more about our safety protocols and contact us for expert consultation.