Damage mechanisms for API 653 inspection

By Carlos Molina

Hi friends. I hope you are all doing well.

Today we are going to review 3 relevant damage mechanisms you should know in order to pass the API 653 certification exam. All of them appear in the BOK for the March 2015 exam. Download this pdf and you´ll find all of the 52 questions, based in API 571 (2 more questions than other pdfs, because I was so into it)

These are Brittle Fracture, Mechanical Fatigue and Atmospheric Corrosion. Continue reading

How to determine joint efficiencies for tank inspection

By Carlos Molina

Hi folks. I hope you are doing well studying for your API 653 certification examination on March 20, 2015.

Here at Apiexam.com, we continue with the explanation of concepts neccessary for passing the API 653 exam. One of the topics you should study in order to pass is calculation of joint efficiencies for shell joints. Continue reading

Calculating intervals for tank inspection

By Carlos Molina

One of the things about API 653 certification is that doesn´t ensure that you are competent in tank inspection. You can pass the exam, and still you don´t always know or remember all you studied in the course, especially if not practiced on a daily basis. One of those things to remember is tank internal inspection interval calculation .

I was wandering the eng-tips forum the other day and I found a question about calculating minimum remaining thickness for a tank bottom.  I saw that forum and decided to write this post in order to clarify the subject more. Besides, this is part of the Body Of Knowledge of the examination, and you know you have to get it right… Continue reading

What part plays RBI in tank inspections

By Carlos Molina

This time I will make a break in the API 653 series and talk you about Risk Based Inspection. This change in the course of the blog is according to 2 reasons

  1. I don´t want to overload google with the “api 653 question” keyword
  2. I need to study for my API 580 certification examination on December, 19th.
  3. I need to make my posts more appealing to comments, questions and answers.

Those are enough reasons to make this break. However, the subject of Risk Based Inspection (RBI) is not alien to static equipment inspection and API certifications, so any thing I write about RBI will be helpful for API certificated personnel. That´s why (besides some writer´s block) I want to try this subject this time.

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In the core of API 653. Path # 3.

By Carlos Molina.

Good morning to all of you.

I am bringing you the third set of 50 questions to study in order to pass the API 653 examination. With these we reach 150 questions and on the way to reach many more. This questions deal with sections 4 to 9 in the API 653 standard.

You know what I did realize? That back then when I was studying for my exam, I didn´t learn all the treats needed to be a successful inspector. But now, the question extracting process has made me aware of a lot more things you should know. I hope you can do the same systematic proccess in your study.

The objective of this website is to give you the most comprehensive guide ever about tank repair, construction and the API examinations so you should pass your own exams. There is a long way to go. Gulp.

You cand download all questions 101th to 150th from Path #3 here in pdf format. If you have some question, please feel free to write it in the comment section.

More pages on the API 653 questions series

1. Beginning the path: API 653 Questions

2. General and definitions. #2 in the API 653 questions series.

Don´t forget to share your thoughts on this info in the comment section.

Cheers and good luck!

General and definitions. #2 in the API 653 questions series.

By Carlos Molina.

We continue discovering questions for your API 653 exam preparation. In the last post I wrote 50 general questions of the whole BOK that will maybe pop-up in the test. This time we have general questions too, but from question 93 and on I will start putting questions in an order according to the standard, beginning with definitions (Section 3).

With these we reach 100 questions and on the way to reach many more. Do you think then that they are too many?

Continue reading

Beginning the path: API 653 Questions

By Carlos Molina

What should you do in order to pass the API 653 exam? Well, you should read the standards well ahead, choose and write down the most questions and answers you can, and, if possible, take the course to reinforce knowledge. Regarding the Q&A´s, you should revisit them regularly using an spaced repetition software. 

The following 50 questions were extracted from the standards by me, or remembered by me or other students that took the exam before.

The format is a Q&A one, different from the multiple choice question format from other courses I have seen online. I prefer this method because it takes away all the clutter that leads to confusion when treating these standards. I advise you to copy this info and paste it in a spaced repetition software like Anki or Supermemo, as the Q&A format allows, and start studying right away.  You could choose to print flashcards too. When days pass by, you will see who you remember all of the information with no problem.

1. Q: What is the minimum thickness for a tank floor plate with no means for leak detection or secondary containment if an RBI program is not in place?

A: 0,1 inches Ref: Table 4.4 API 653

Don´t hesitate to keep reading if you are studying for the API 653 exam, as there is a downloadable  for you.

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What to study to pass the api 653 examination

By Carlos F Molina

Choosing to read this article is choosing to begin the path to API certifications. The most important objective of apiexam.com is to give affordable, safe learning advice in order for you to pass the API certification examinations, beginning now, and not having to make the course and spend the bunch of money it costs.

The way I see it, if you already decided you want to try certification, you have 4 options…..

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Introduction to the API 653 Certification Exam

By Carlos F Molina

With this post I am announcing the birth of APIEXAM.COM, a website dedicated to deliver resources to pass the certification examinations of the Individual Certification Programs of the American Petroleum Institute. It is a compendium of the subject that will grow while I study for the exams. For the time being, you will see plain posts about the subject in a blog format, but the idea is that with your help we will be improving the site and increase resources. Welcome.


If you read the first chapter of API 653, you will see it is a standard that covers Inspection, Repair, Alteration, and Reconstruction of steel storage tanks built to API 650 and its predecessor, API 12C. It provides minimum requirements for maintaining the integrity of such tanks after they have been placed in service and addresses inspection, repair, alteration, relocation, and reconstruction. Continue reading