Getting Started: API 653 Aboveground Storage Tanks Inspector

API's Inspector Certification Programs are based on industry-developed standards that are recognized and used with confidence worldwide. These standards have also provided a uniform platform that serves as a model for many state and government regulations. These API programs emphasize professional credibility and process integrity. They enable inspectors to play an active role in improving industry health and safety; environmental performance; ensuring compliance and self-regulation; and strengthening management control and internal inspection capabilities.

Register for CASTI Training Programs

CASTI provides exam preparation training to help candidates pass the API 653 Storage Tank Inspector Certification Exam. Our blended learning program includes detailed lessons on topics covered in the exam, practice exam questions, step-by-step solutions, and e-instructor support. CASTI training programs are separate from the certification exams, which are administered by the American Petroleum Institute (API).

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Visit the CASTI API 653 course page to review the course outline and register for the course.

Education and Experience Requirements

To take the API 653 examination, a candidate must meet at least one of the following criteria:

API 653 Aboveground Storage Tanks Inspector Examination


Starting in January 2014, API will no longer be accepting paper applications. You must enroll in API's new online portal for application submission. API has also changed the examination delivery method from paper-and-pencil to computer-based-testing (CBT).

Additionally, there will no longer be one global exam day, but a 10-day testing window. This means each applicant will have a choice of when or where they want to test within the given window. Tests will be available at any of the Prometric computer testing centers around the world.

For more information about the API ICP changes, please visit: API Individual Certification Program (ICP)

The API 653 ICP examination is 6.5 hours long and consists of 150 multiple-choice questions divided into two parts:


Exam Codes and CASTI Courses

All exam candidates will need the referenced Codes as they appear in the Effectivity sheet to study from and to complete the exam preparation course. These code documents can be purchased from CASTI.

For more information about CASTI's API 653 Exam Preparation courses, please visit:

This summary of educational requirements, examination and renewal, and recognition and reciprocity information is provided for your general overview. It is important that you read the complete documents containing these details as provided by API, ASME, CSA, AWS and CASTI.

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