API 653 Aboveground Storage Tank Inspector

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For professionals in the oil, gas, and petrochemical industries, the API 653 Aboveground Storage Tank Inspector certification is the "gold standard." It distinguishes individuals who possess the specialized knowledge required to ensure the structural integrity and safety of large-scale storage tanks. This guide provides an exhaustive breakdown of everything you need to know to earn and maintain this prestigious credential.

What is the API 653 Aboveground Storage Tank Inspector?

The API 653 certification is a professional credential designed for inspectors and engineers responsible for the inspection, repair, alteration, and reconstruction of steel aboveground storage tanks (ASTs) used in the petroleum and chemical industries.

  • Official Exam Name & Acronym: API 653 Aboveground Storage Tank Inspector Certification (API 653).
  • Conducting Body/Authority: The American Petroleum Institute (API), specifically through its Individual Certification Programs (ICP). Established in 1919, API is the primary trade association for the U.S. oil and natural gas industry and sets global standards for energy equipment and operations.
  • Purpose of Exam: Professional Certification. It ensures that inspectors are competent in applying the API 653 standard to maintain tank safety and prevent environmental leaks.
  • Geographic Validity: This is a globally recognized qualification. It is the mandatory standard in the United States and is widely adopted in Canada, the Middle East, Southeast Asia, and Europe.
  • Level of Competence: Specialist/Professional Level. It is not an entry-level exam; it requires significant field experience and technical proficiency.
  • Brief History: The API 653 standard was first published in 1991 to address the need for a uniform inspection code for tanks built to API 650 or API 12C standards. The certification program was launched shortly thereafter to standardize the qualifications of personnel performing these critical inspections.

Who Can Take the API 653 Aboveground Storage Tank Inspector? (Eligibility Requirements)

API uses a combination of formal education and relevant work experience to determine eligibility. You must meet one of the following criteria to apply for the exam.

Eligibility Summary Table

Education Level Required Years of Experience Experience Type
Bachelor of Science in Engineering or Technology 1 Year Supervision or performance of inspection activities as described in API 653.
2-year Degree (Associate's) in Engineering or Technology 2 Years Design, construction, repair, operation, or inspection of aboveground storage tanks.
High School Diploma or Equivalent 3 Years Design, construction, repair, operation, or inspection of aboveground storage tanks.
No Formal Education 5+ Years Design, construction, repair, operation, or inspection of aboveground storage tanks.

Documentation Checklist

  • Academic Transcripts: Required if applying based on an engineering degree or diploma.
  • Employment Verification: A signed statement from an employer or supervisor verifying your years of experience and specific job duties related to tanks.
  • ID Proofs: A valid, government-issued photo ID (Passport or Driver’s License) is required for both the application and the testing center.
  • Professional References: Contact details for supervisors who can vouch for your technical experience.
  • Language Proficiency: While there is no formal IELTS/TOEFL requirement, the exam is conducted in English. Candidates must be proficient in technical English to understand the code books and questions.

How to Register for the API 653 Aboveground Storage Tank Inspector

Exam Schedule & Availability

The API 653 exam is administered three times per year during specific testing windows. These windows typically occur in:

  • March (Applications usually close in early January)
  • July (Applications usually close in mid-May)
  • November (Applications usually close in mid-September)

Exam Fees (Detailed Breakdown)

Fee Category API Member Cost Non-Member Cost
Standard Application Fee $730 USD $940 USD
Late Registration Fee +$150 USD +$150 USD
Rescheduling Fee (via Prometric) $35 - $100 USD $35 - $100 USD
Retake Fee $320 USD $320 USD
Recertification Fee (Every 3 years) $620 USD $830 USD

Booking Process

  1. Create an ICP Account: Visit the API website and create a profile in the Individual Certification Programs portal.
  2. Submit Application: Upload your experience verification and educational documents.
  3. Pay the Fee: Payment must be made via credit card or wire transfer before the application is reviewed.
  4. Receive Exam Authorization: Once approved, API sends an "Exam Authorization ID" via email.
  5. Schedule with Prometric: Use your ID to book a specific date, time, and location through the Prometric website.

Retake Policy

If you fail the exam, you may apply for a retake. You are allowed three attempts within a 12-month period from your first attempt. If you fail all three times, you must wait another year and file a new full application.

Score Validity

The certification is valid for three years. To keep the credential active, inspectors must apply for recertification every three years and demonstrate that they have spent at least 20% of their time performing inspection activities.

API 653 Aboveground Storage Tank Inspector Exam Format & Structure

Exam Format

The exam is a Computer Based Test (CBT) delivered at Prometric testing centers. It is divided into two distinct parts:

  • Closed-Book Portion: Tests your knowledge of core concepts without the use of reference materials.
  • Open-Book Portion: Tests your ability to find and apply specific codes, formulas, and data within the permitted API standards.

Timing & Duration

Section Duration Number of Questions
Tutorial & Confidentiality 15 Minutes N/A
Closed-Book Section 2 Hours 45 Minutes 100 Questions
Scheduled Break 45 Minutes Optional
Open-Book Section 3 Hours 45 Minutes 50 Questions
Total 7.5 Hours 150 Questions

Syllabus & Content Domains

The exam covers the "Effectivity Sheet" codes, which include API 653, API 650, API 651, API 652, API 571, API 575, API 577, and ASME Section V & IX.

Domain Topics Covered Weightage (Approx.)
Inspection & Testing Internal/External inspection intervals, NDE procedures, hydro-testing. 30%
Design & Reconstruction Tank shell, bottom, and roof design; reconstruction tolerances. 25%
Repairs & Alterations Welding requirements, patch plate installation, hot tapping. 20%
Corrosion & Protection Cathodic protection (651), lining (652), and degradation mechanisms (571). 15%
Welding & Materials ASME Section IX, API 577, material identification. 10%

How is the API 653 Aboveground Storage Tank Inspector Scored?

Passing Score

API uses scaled scoring. The passing threshold is typically set at a scaled score of 70. Because some questions are harder than others, the number of raw correct answers required may vary slightly between exam forms, but it generally equates to roughly 70-72% correct.

Scoring Mechanics

  • No Negative Marking: You are not penalized for wrong answers. It is always in your best interest to guess if unsure.
  • Unscored Questions: Out of the 150 questions, 25 are "pre-test" questions used for future exams. These are not identified and do not count toward your final score.
  • Sectional Cut-offs: There are no individual section cut-offs; you only need to pass the overall combined score.

Score Reporting

Candidates receive a preliminary "Pass/Fail" result on the computer screen immediately after finishing the exam. Official results and a detailed diagnostic report (showing performance in each domain) are emailed within 6 to 8 weeks.

How Difficult is the API 653 Aboveground Storage Tank Inspector?

The API 653 is considered Challenging to Very Difficult. It requires not just memorization, but the ability to perform complex calculations (such as minimum remaining shell thickness) under time pressure.

Historical Pass Rates

Metric Estimated Percentage
First-Time Pass Rate 50% - 55%
Overall Pass Rate (including retakes) 65%

Most Challenging Topics: ASME Section IX (Welding Qualifications) and API 650 (New Tank Construction) calculations are cited by candidates as the most difficult areas.

API 653 vs. Similar Certifications

Feature API 653 STI SP001 API 510
Primary Focus Large Field-Erected Tanks Shop-Fabricated Tanks Pressure Vessels
Difficulty High Moderate High
Recertification 3 Years 5 Years 3 Years
Best Suited For Refinery/Terminal Inspectors Small Fuel Depot Inspectors Refinery/Plant Inspectors

How to Prepare for the API 653 Aboveground Storage Tank Inspector

Recommended Study Timeline

  • Total Preparation Time: 150 - 200 hours.
  • Months 1-2: Read through API 653 and API 650 once. Focus on understanding the layout of the codes.
  • Month 3: Focus on calculations (t-min, hydro-test heights, venting) and ASME Section V/IX.
  • Month 4: Practice exams and timed open-book searches.

Best Study Resources

  • Official API Codes: You MUST have the latest versions of the codes listed on the API Effectivity Sheet.
  • Prep Courses: Companies like MSTS, CASTI, and API University offer 5-day intensive "boot camps" which are highly recommended.
  • Practice Exams: Utilize platforms like Atlas API Training or Exam-Labs for realistic CBT simulations.

What to Expect on Exam Day

  • Arrival: Arrive at the Prometric center 30 minutes early.
  • Security: You will be scanned with a metal detector. Watches, jewelry, and calculators are prohibited.
  • Calculator: An on-screen scientific calculator is provided within the testing software.
  • Reference Materials: For the open-book portion, the codes are provided as searchable PDFs on the computer screen. You cannot bring your own paper copies.

After Passing the API 653 Aboveground Storage Tank Inspector

Once certified, you will receive a digital badge and a hard-copy certificate. Career opportunities include:

  • Third-Party Inspector: Working for firms like SGS, Bureau Veritas, or Intertek.
  • Owner-User Inspector: Working directly for companies like Shell, ExxonMobil, or BP.
  • Salary Impact: Certified API 653 inspectors often earn between $100,000 and $160,000 USD annually, depending on overtime and location.

Frequently Asked Questions

  1. Is the API 653 exam open book? Yes, but only for the second half (50 questions). The first half (100 questions) is closed-book.
  2. Can I use a physical code book? No. Since 2017, all API exams use PDF versions provided on the computer.
  3. How many questions do I need to get right? Roughly 88-90 out of the 125 scored questions.
  4. Does the certification expire? Yes, every three years.
  5. Can I take the exam online from home? No, API 653 currently requires physical presence at a Prometric center.
  6. What is the difference between API 650 and API 653? API 650 is for building new tanks; API 653 is for inspecting and repairing existing ones.
  7. What happens if I miss the application deadline? You must wait for the next testing window (approx. 4 months later).
  8. Is there math on the exam? Yes, significant algebra and formula manipulation are required.
  9. Are there any prerequisites like AWS CWI? No, but being a CWI (Certified Welding Inspector) helps significantly with the welding portions.
  10. Is API 653 valid in Australia/UK? Yes, it is the standard for tank inspection in those regions.

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