API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 321:

  Refractory anchor material must be compatible with the _________ of the base metal

  A. Composition
  B. Welding
  C. Thermal coefficient
  D. Ductility
  C. Thermal coefficient

• Question 322:

  Corrosion due to acidic sour water containing H睸 at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO? may also be present. Which of the following materials is susceptible to sour water corrosion?

  A. Carbon steel
  B. 300 Series SS
  C. 400 Series SS
  D. Both B and C
  A. Carbon steel

• Question 323:

  _____________ usually occurs when a colder liquid contacts a warmer metal surface.

  A. Brittle fracture
  B. Thermal fatigue
  C. Thermal shock
  D. Stress rupture
  C. Thermal shock

• Question 324:

  When caustic stress corrosion cracking is a concern, steam out of _________ carbon steel piping and equipment should be avoided.

  A. PWHT
  B. Non-PWHT
  C. Ferritic
  D. Hardened
  B. Non-PWHT

• Question 325:

  Nitriding begins above ________ and becomes severe above _______.

  A. 500?F, 800?F
  B. 600?F, 900?F
  C. 800?F, 1000?F
  D. 700?F, 1100?F
  B. 600?F, 900?F

• Question 326:

  300 series stainless steel heater tubes in an oil-burning furnace in the hydrocracker began to leak and the furnace was brought down. What was the probable cause of the cracking?

  A. Chloride stress corrosion
  B. Polythionic acid stress corrosion
  C. Amine stress corrosion
  D. Stress oriented hydrogen induced cracking
  B. Polythionic acid stress corrosion

• Question 327:

  300 Series SS can be used for sour water service at temperatures below ____________, where Chloride SCC is not likely.

  A. 120?F
  B. 140?F
  C. 150?F
  D. 175?F
  B. 140?F

• Question 328:

  Thermal fatigue damage is in the form of cracking that may occur anywhere in a metallic component where relative movement is constrained, particularly under repeated __________.

  A. Cyclic stresses
  B. Thermal cycling
  C. Pressure variations
  D. All of the above
  B. Thermal cycling

• Question 329:

  Which of the following are susceptible to thermal fatigue?

  A. SA-516-70
  B. SA-182 Gr B
  C. SA-53 Gr B
  D. All of the above
  D. All of the above

• Question 330:

  Erosion and erosion-corrosion metal loss is characterized by:

  A. smooth pits.
  B. linear striations.
  C. grooves and gullies.
  D. rough pits and pock marks.
  C. grooves and gullies.

  ---

  Erosion and erosion-corrosion are mechanical degradation mechanisms enhanced by fluid motion, and

  typically result in directional or flow-oriented metal loss patterns.

  According to API RP 571 Section 5.4.2 (Erosion and Erosion/Corrosion):

  "Erosion typically results in localized thinning, often described as grooves, gullies, or horseshoe-shaped patterns... The metal loss is directional and may occur in elbows, tees, reducers, and pumps."

  Hence, Option C (grooves and gullies) most accurately describes erosion and erosion-corrosion

  characteristics.