{"id":11057,"date":"2020-05-04T09:41:40","date_gmt":"2020-05-04T09:41:40","guid":{"rendered":"https:\/\/arvengtraining.com\/?p=11057"},"modified":"2023-07-26T16:14:38","modified_gmt":"2023-07-26T14:14:38","slug":"inspection-and-repair-of-storage-tanks-according-to-api-653","status":"publish","type":"post","link":"https:\/\/arvengtraining.com\/en\/inspection-and-repair-of-storage-tanks-according-to-api-653\/","title":{"rendered":"Inspection and repair of Storage Tanks according to API 653"},"content":{"rendered":"

The API 653 standard was developed to guide during the inspection, repair, alteration and dismantling works of storage tanks designed and manufactured under API 650 or API 12C.<\/p>\n

Contents are divided into the following sections:<\/p>\n

    \n
  1. Scope<\/li>\n
  2. References<\/li>\n
  3. Definitions<\/li>\n
  4. Suitability for Service<\/li>\n
  5. Brittle Fracture Considerations<\/li>\n
  6. Inspection<\/li>\n
  7. Materials<\/li>\n
  8. Design Considerations for Reconstructed Tanks.<\/li>\n
  9. Tank repair and Alteration<\/li>\n
  10. Dismantling and Reconstruction<\/li>\n
  11. Welding<\/li>\n
  12. Examination and Testing<\/li>\n
  13. Marking and Recordkeeping<\/li>\n
  14. Annexes<\/li>\n<\/ol>\n

    The Scope of the API 653 Standard<\/strong> is limited to the following tank components: foundation, tank bottom, shell, structure, roof, and nozzles to the face of the first flange.<\/p>\n

    For the assessment of degradation during service, additional normative must be consulted, such as API 579-1 \/ ASME FFS-1 (Fitness for Service). This normative defines the acceptance procedures and criteria to be considered in the failure analysis. It is important to be familiar with these regulations for an adequate evaluation of the tank.<\/p>\n

    When a physical modification to the tank is required, an assessment of the future integrity of the tank will be performed.<\/p>\n

    The main factors that must be taken into account during the tank integrity evaluation the ones associated with the stored product, the environmental conditions, materials, live loads, foundations, distortions of the existing tank, etc.<\/p>\n

    One of the most important sections of the API 653 standard is the one associated with inspection requirements. When scheduling and carrying out periodic inspections to \u201cin service\u201d storage tanks,<\/strong> the requirements indicated in Section 6 of the said standard must be considered.<\/p>\n

    What is the main purpose of in-service tank inspection?<\/p>\n

    The primary objective is to ensure the integrity of the tank during its future operating state. It will be necessary to carry out an external inspection<\/strong> that includes a visual inspection, an analysis of thicknesses employing ultrasonic tests as well as an inspection of the cathodic protection (according to API 651 standard).<\/p>\n

    In addition to external inspection, an internal inspection<\/strong> of the tank should be carried out, mainly to assess the integrity of the tank bottom.<\/p>\n

    The frequency of inspections will be based on the history of the tank in service, its corrosion rates, and the type of inspection considered.<\/p>\n

    \"\"<\/em><\/p>\n

    Replacement of the bottom plates of a tank<\/em><\/p>\n

    The API 653 standard establishes the inspection frequency for storage tanks (both internal and external) based on different factors such as:<\/p>\n