Online Access Free API-571 Practice Test

300 series austenitic stainless steels susceptible to polythionic acid stress corrosion cracking (PTA SCC) can become sensitized when heated in the range of:

• A.1200°F to 1650°F (622°C to 900°C)
• B.400°F to 675°F (204°C to 357°C)
• C.1650°F to 1725°F (899°C to 941°C)
• D.750°F to 1500°F (400°C to 815°C)

Refer to the following table:
Corroded End - Anodic (More Active)
Magnesium
Magnesium alloys
Zinc
Aluminum
Aluminum alloys
Steel
Cast iron
Type 410 SS (active state)
Ni-Resist
Type 304 SS (active state)
Type 316 SS (active state)
Lead
Tin
Nickel
Brass
Copper
Bronze
Copper-Nickel
Monel
Nickel (passive state)
Type 410 SS (passive state)
Type 304 SS (passive state)
Type 316 SS (passive state)
Titanium
Graphite
Gold
Platinum
Protected End - Cathodic (More Noble)
Which of the following metal combinations is most likely to experience galvanic corrosion in brackish water or seawater?

• A.Aluminum coupled to steel
• B.Brass coupled to nickel
• C.Steel coupled to nickel
• D.Cast iron coupled to Ni-resist

Polythionic acid stress corrosion cracking is:

• A.Found only in low carbon grades of austenitic stainless steel.
• B.Typically localized and may not be evident until a leak appears.
• C.Rarely found in process furnaces.
• D.Identified by transgranular cracking on the process side of equipment and piping.

Brittle fracture of a component is closely related to:

• A.Number of thermal cycles
• B.Tensile strength
• C.Material toughness
• D.Ductility

Convection section soot blowers that have steam supplies without a steam trap can cause:

• A.condensate corrosion.
• B.thermal fatigue.
• C.CO2 corrosion.
• D.carbonic acid corrosion.