The API Exam Handbook

API 653 Mock Exam: 10 Questions

Try these 10 mock exam questions from the API 653 BoK. Give yourself 30 minutes (if you look them up in the API 653 Effectivity List codes) or 10 minutes if you attempt them closed-book (not recommended unless you are very familiar with API/ASME codes). There is a single correct answer unless stated otherwise. If there are multiple answers mentioned, you must get exactly the correct answers; if you tick too few or too many answers you get the question wrong, with no credit for any correct answers you did choose. Sorry, that’s the exam rules.

A good mark is 7/10 correct. Choose your answers, then check out the answers here

Qu 1. Similar service evaluation of soil-side corrosion rates is typically only useful for tanks;

a) With 10+ years corrosion history
b) With unlined bottoms
c) On similar inspection intervals
d) On a given site

Qu 2. Residual mill scale on hot-rolled tank bottom plates commonly causes?

a) HIC
b) Fatigue crack initiation
c) Fretting-related corrosion
d) Galvanic cell corrosion

Qu 3. What type of tank pad is not recommended for new tank construction fitted with a CP system? There may be one or more correct answers.

a) Oiled sand
b) Clean sand, mechanically compacted
c) Crushed limestone
d) Asphalt

Qu 4. When doing an external roof inspection of a tank containing volatile hydrocarbons, the inspector should;

a) Walk on weld seams
b) Position the floating roof as low as possible
c) Inspect the underside of the roof from inside the tank first
d) Not walk on the roof for safety reasons

Qu 5. Welding procedures for ladders and handrails for an API 650 tank shall comply with which codes? There may be one or more correct answers.

d) AWS D1.1

Qu 6. When adding a new penetration to a tank shell for which PWHT is required, when must the welds be tested by PT/MT?

a) Before hydrostatic testing
b) Before and after hydrostatic testing
c) Only for material ≥0.25% C unless the tank engineer approves otherwise
d) Before final grinding of weld caps

Qu 7. During tank reconstruction, existing weld joints shall meet;

a) API 650
b) ASTM A6
c) The as-built standard
d) The current applicable standard

Qu 8. When can a bottom lap-patch repair be considered a permanent repair?

a) It can’t. They are always temporary
b) If the floor has a CP system installed
c) If they have an ongoing inspection and maintenance programme
d) Always, with the approval of the API inspector

Qu 9. Who may appoint a reconstruction organisation to disassemble a tank and reconstruct it on a different site? There may be one or more correct answers.

a) The API authorized inspector
b) The jurisdiction
c) The owner-user
d) A repair organisation

Qu 10. How many thickness measurements are required to determine the lowest average shell thickness over a length L?

a) Minimum 5, on a plane containing the minimum thickness t2
b) Minimum 5, equally spaced
c) Minimum 15 per 40in length
d) Minimum 15, equally spaced

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