API-571

API-571 practice questions, page 8 of 18, with answer review and explanations.

Question 36

Amine stress corrosion cracking is a term applied to the cracking of steels under the combined actions of ________ and __________ in aqueous alkanolamine systems used to remove/absorb H²S and/or CO² and their mixtures from various gas and liquid hydrocarbon streams.

  1. Temperature, pressure
  2. Pressure, stress
  3. Temperature, corrosion
  4. Tensile stress, corrosion

Question 37

______ is similar to HIC but is a potentially more damaging form of cracking which appears as arrays of cracks stacked on top of each other. The result is a through thickness crack that is perpendicular to the surface and is driven by high levels of stress.

  1. MIC
  2. SOHIC
  3. Sulfuric SCC
  4. None of the above

Question 38

Weld heat affected zone graphitization is most frequently found in the heat affected zone adjacent to welds in a narrow band, corresponding to the low temperature edge of the heat affected zone. In multi-pass welded butt joints, these zones overlap each other covering the entire cross section. Because of its appearance, this type of graphitization is called________.

  1. Half-moon
  2. Eyebrow
  3. Radii
  4. None of the above

Question 39

At a given pressure, the H²S concentration in the sour water _________ as temperature _________.

  1. Increases, increases
  2. Decreases, decreases
  3. Increases, decreases
  4. Decreases, increases

Question 40

In order for PASCC to occur the material must be ______.

  1. PWHT
  2. Non-PWHT
  3. Sensitized
  4. Austenitic