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API 653 Tank Inspection Services

Assisting Tank Owners/Operators in Achieving API Certification

Essential requirements regarding the integrity of above-ground steel tanks are described in the American Petroleum Institute (API) Standard 653. This important standard also identifies considerations regarding the inspection, repair, alteration, relocation and reconstruction of above-ground tanks. The scope of the standard includes:

  • Tank foundation
  • Tank bottom
  • Tank structure
  • Roof of the tank
  • All tank attachments, such as nozzles

API 653 compliance also requires regular tank inspections, which must be conducted by API-certified inspectors. The frequency of these mandated inspections may vary depending on the specific installation. However, API 653 tank inspections usually involve a comprehensive external and internal inspection, as well as an assessment of the thickness of the tank bottom.

Tank owners/operators must also maintain documentation about the construction and ongoing maintenance of the tank, and retain copies of all inspection records. Finally, they must implement a comprehensive safety program to protect the health and safety of workers and inspectors.

Our services at a glance

  • API 653 visual inspection
  • API 653 engineering evaluations and repair recommendations
  • MFE floor scanning, with indications confirmed by ultrasonic testing
  • Vacuum box inspection of the bottom plate lap welds and internal shelf-to-bottom weld
  • ACFM weld inspection
  • Ultrasonic inspection of the tank shell and roof
  • Settlement evaluations in accordance with API 653 requirements
  • Tank inspection services
  • Comprehensive, quality reporting
  • Support services

Why choose TÜV SÜD America?

TÜV SÜD America, Chemical, Oil and Gas is one of the largest employers of API-certified and API-qualified inspectors in the U.S. Our mechanical integrity program is recognized as the standard in the petrochemical industry. And TÜV SÜD laboratories and testing facilities can perform quality API 653 tank inspections on almost any form of ferrous material, component or product assembly, helping you achieve API 653 certification.

TÜV SÜD America, Chemical, Oil and Gas has been synonymous with quality inspection services in the energy and chemical industries for more than 30 years. We’re part of the global network of TÜV SÜD AG, and have access to a complete range of product testing, certification and audit services. From unbundled risk evaluations to management systems and product testing, we deliver what other inspection companies cannot.


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