API
API-571
Q1:
Corrosion from oxygen in boiler feed water usually creates:
○
A
Uniform corrosion.○
B
Isolated pitting.○
C
Intergranular cracking.○
D
Transgranular cracking.○
E
Hard and brittle zones.
API
API-571
Q2:
Many thermal fatigue cracks are filled with:
○
A
chlorides.○
B
hydroslime.○
C
oxides.○
D
sulfides.
API
API-571
Q3:
Thermal fatigue cracks usually:
○
A
Initiate on the surface of the component.○
B
Initiate in the subsurface of the component.○
C
Grow very rapidly (at the speed of sound in the material).○
D
Are very tight and narrow.
API
API-571
Q4:
Which of the following is not a primary initiating point for thermal fatigue?
○
A
Notches○
B
Rounded pits○
C
Nozzle-to-shell welds○
D
Weld toes
API
API-571
Q5:
Which of the following is not a prime candidate for thermal fatigue?
○
A
Coke drums○
B
Steam actuated soot blowers○
C
Mix points of hot and cold streams○
D
600 psig steam piping○
E
Welds joining materials having different coefficients of expansion