Free Access API.API-571.v2025-12-13.q120 Practice Test (Page 17)

Question 76

The creep threshold temperature for carbon steel is ________.

A.426º C

B.371º C

C.315º C

D.538º C

Question 77

All piping and equipment exposed to HF acid at any concentration with hardness levels above the recommended limit (237 BHN) are subject to _________.

A.None of the above

B.Sulfide stress cracking

C.Hydrogen stress cracking

D.Chloride stress cracking

Question 78

For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance?

A.Lower the water velocity

B.Increase the tube diameter

C.Upgrade the metallurgy of the exchanger

D.Increase the process side temperature above 212°F (100°C)

Question 79

Which of the following does not increases the likelihood of atmospheric corrosion?

A.Bird poop

B.Increasing annual rainfalls

C.Increasing amounts of airborne contaminates

D.Locations where moisture is trapped

E.Increasing operating pressures

Question 80

_________ material sections also have a ___________ resistance to brittle fracture due to higher constraint, which increases triaxial stresses at the crack tip.

A.Thicker, Higher

B.Thinner, Higher

C.Thicker, Lower

D.Thinner, Lower

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Question 76

Question 77

Question 78

Question 79

Question 80

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