API 570 Question Bank (API 570 QB001)

Today's questions here............

30) Environmental cracking of austenite stainless steels is caused many times by:-

a) Exposing areas to high-velocity and high-turbulence streams

b) Excessive cyclic stresses that are often very low

c) Exposure to chlorides from salt water, wash-up water, etc.

d) Creep of the material by long time exposure to high temperature and stress

31) When the inspector suspects or is advised that specific piping circuits may be susceptible to environmental cracking, the inspector should:

a) Call in a piping engineer for consultation.

b) Investigate the history of the piping circuit.

c) Obtain advice from a Metallurgical Engineer.

d) Schedule supplemental inspections.

32) If environmental cracking is detected during internal inspection of pressure vessels, what should the inspector do?

a) The inspector should designate appropriate piping spools upstream and downstream of the vessel to be inspected if piping is susceptible to environmental cracking.

b) The inspector should consult with a metallurgical engineer to determine extent of the problems

c) The inspector should review history of adjacent piping to determine if it has ever been affected.

d) The inspector should consult with a piping engineer to determine the extent of the problems.

33) If external or internal coatings or refractory liners on a piping circuit are in good condition, what should an inspector do?

a) After inspection, select a portion of the liner for removal

b) The entire liner should be removed for inspection

c) Selected portions of the liner should be removed for inspection

d) After inspection, if any separation, breaks, holes or blisters are found, it may be necessary to remove portions of the lining to determine the condition under it.

34) What course of action should be followed it a coating of coke is found on the interior of a large pipe of a reactor on a Fluid Catalytic Cracking Unit?

a) Determine whether such deposits have active corrosion beneath them. If corrosion is present, thorough inspection in selected areas may be required.

b) The coke deposits should be removed from the area for inspection.

c) The coke deposits may be ignored – the deposits will probably protect the line from corrosion.

d) Consult with a Process Engineer and a Metallurgist on the necessity of removing the coke deposits.

35) Fatigue cracking of piping systems may result from 

a) Embrittlement of the metal due to it operating below its transition temperature

b) Erosion or corrosion / erosion that thin the piping where it cracks

c) Excessive cyclic stresses that are often well below the static yield strength of the material

d) Environmental cracking caused by stress corrosion due to the presence of caustic, amine, or other substance.

36) Where can fatigue cracking typically be first detected?

a) At points of low-stress intensification such as reinforced nozzles

b) At points of high-stress intensification such as branch connections

c) At points where cyclic stresses are very low

d) At points where there are only bending or compressive stresses.

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