API Study Guide 2026
Everything you need to pass the API exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 API Exam Format at a Glance
📚 API Topics to Study (37)
✍️ Sample API Questions & Answers
1. Which of the following API certifications is crucial for ensuring the quality of materials used in drilling equipment?
API 6A specifies requirements for wellhead and Christmas tree equipment, which are critical for controlling well flow and pressure. API 7K covers drilling and well servicing equipment, including rotary drilling equipment and components. Both standards are essential for ensuring the quality and safety of materials used in drilling operations.
2. In the context of API inspection, what is a 'corrosion circuit' or 'inspection circuit'?
A corrosion circuit is a defined segment of piping or equipment expected to corrode at similar rates due to similar process conditions, used to rationalize inspection point selection.
3. Which quality improvement method is most applicable to quality control & inspection methods in American Petroleum Institute Certification?
The PDCA cycle is widely recognized as the most effective quality improvement method, allowing API professionals to systematically improve quality control & inspection methods practices.
4. What is the role of mud in drilling operations?
Drilling mud, or drilling fluid, serves several vital functions in drilling operations. It cools and lubricates the drill bit, carries rock cuttings to the surface, and most importantly, it exerts hydrostatic pressure to counteract formation pressures, preventing dangerous blowouts and maintaining wellbore stability.
5. In API 571, naphthenic acid corrosion is most commonly associated with which process condition?
Naphthenic acid corrosion occurs at elevated temperatures (typically 450–750°F) when processing high TAN crude oils, affecting carbon steel and even some stainless steels in distillation units.
6. What is 'risk target' or 'risk tolerance' as used in API 580 RBI programs?
A risk target defines the acceptable risk level; equipment exceeding this threshold triggers more intensive inspection or mitigation to reduce risk below the target.