Online Access Free API-571 Exam Questions

In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?

• A.Carbonates
• B.Cyanides
• C.Amines
• D.Polythionic acid

The potential for galvanic corrosion will increase when:

• A.applying a coating to both metals.
• B.insulating dissimilar metals with different electro-chemical potentials.
• C.using a relatively large volume of anodic material.
• D.different metals are in contact with presence of electrolyte.

(Creep damage can be mitigated by:)

• A.Solution anneal heat treatment
• B.Removing the damaged material
• C.Postweld heat treatment at 1150 °F (621 °C)
• D.Preheating to 500 °F (260 °C) during repair welding

Temper embrittlement is defined as:

• A.An increase in ductility and notch toughness caused by postweld heat treatment (PWHT) or high- temperature service above 120°F (49°C).
• B.A reduction in ductility and notch toughness caused by postweld heat treatment (PWHT) or low- temperature service below 120°F (49°C).
• C.A reduction in fracture toughness caused by long-term exposure in the temperature range of 650°F to
  1070°F (345°C to 575°C).
• D.An increase in toughness caused by long-term exposure in the temperature range of 650°F to 1100°F (345°C to 595°C).

(What is the minimum pH value where chloride stress corrosion cracking begins to occur?)

• A.10
• B.2
• C.7
• D.4