The API Exam Handbook

API 570 Mock Exam: 10 Questions

Try these 10 mock exam questions from the API 570 BoK. Give yourself 30 minutes (if you look them up in the API 570 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. Which of these will suffer the worst galvanic corrosion when connected to type 316 passive-state stainless steel;

a) Type 304SS (passive static)
b) Carbon steel
c) Aluminium
d) Copper-Nickel

Qu 2. What is the minimum test pressure of a Class 300 A350 Gr LF6 Cl.2 forged fitting with a design temperature of 200°C?

a) 48.6 bar
b) 52 bar
c) 73 bar
d) 78 bar

Qu 3. For ferrous piping materials not listed in B31.1 Table A-1, allowable stress (S) may be calculated using;

a) SY/3
b) 2/3 ST
c) ST/3
d) ST/4

Qu 4. Personnel training requirements for the assembly of flanged pipe joints are set out in;

c) ASME B16.5
d) ASNT-TC-1A and CP 189

Qu 5. When may the preheat-only method not be used as an alternative to PWHT? There may
be one or more correct answers.

a) The material is P-3 (Gr 1 or 2)
b) The preheat used < 300°C
c) Impact testing is required
d) The PWHT is for environmentally-influenced cracking (EIC) considerations

Qu 6. A buried piping system has a design pressure of 200psi and a maximum operating
pressure of 150psi. It is buried in a soil of resistivity 8000 ohm-cm and not protected
by a CP system. If it is decided to perform leak-testing in lieu of inspection, it should be

a) At 210psi every 5 years
b) At 300psi every 10 years
c) At 165psi every 10 years
d) At 165psi every 5 years

Qu 7. For unknown piping materials, MAWP calculations may be made assuming;

a) Average-grade material strengths in the applicable code
b) Lowest-grade material strengths in the applicable code
c) Allowable stress is 17.5ksi
d) The material is A283 Grade C

Qu 8. After short-term and long-term corrosion rates have been compared, who selects the corrosion rate that best reflects the current process conditions?

a) The inspector
b) The inspector or owner-user
c) The inspector and owner-user
d) The inspector and corrosion specialist

Qu 9. Which of these parameters are not included in ‘pressure design thickness’? There may be one or more correct answers.

a) Corrosion allowance
b) Reinforcement thickness
c) Mill tolerances
d) Structural loads

Qu 10. Corrosion rates at CMLs shall be calculated using, as a minimum;

a) 15 readings, including the thinnest measured
b) The three thinnest readings measured around each recording point
c) The thinnest or an average reading at each recording point
d) Three readings in a 2in (50mm) diameter circle at each recording point

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