Question 1

With sour water corrosion, at a given pressure, the H₂S concentration in the sour water _________ as temperatures ________.

Accepted Answer

A)  Increases, increases 
B)  Decreases, decreases 
C)  Increases, decreases 
D)  Decreases, increases

Question 2

Titanium should not be used in known hydriding services such as _____ or ______.

Accepted Answer

A)  Caustic, amine 
B)  Amine, sour water 
C)  Sour water, Alkylation 
D)  All of the above

Question 3

Nickel based alloys usually contain ________ nickel.

Accepted Answer

A)  ≥30% 
B)  ≥20% 
C)  ≥10% 
D)  ≥12%

Question 4

What test is used to determine a material's toughness?

Accepted Answer

A)  Charpy impact test 
B)  Guided bend test 
C)  Metallography 
D)  Tension test 
E)  Physical fitness test

Question 5

Which of the following are susceptible to thermal fatigue?

Accepted Answer

A)  SA-516-70 
B)  SA-182 Gr B 
C)  SA-53 Gr B 
D)  All of the above

Question 6

In order to minimize and prevent amine SCC, PWHT all carbon steel welds in accordance with API RP _____.

Accepted Answer

A)  751 
B)  912 
C)  510 
D)  945

Question 7

Surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel based alloys under the combined action of tensile stress, temperature and an aqueous chloride environmental is called ________. The presence of dissolved oxygen ___________ the propensity for cracking.

Accepted Answer

A)  Cl SCC, Increases 
B)  Stress cracking, Increases 
C)  Cl SCC, Decreases 
D)  Stress cracking, Decreases

Question 8

Corrosion under insulation becomes more severe at metal temperatures between ________ and ________, where water is less likely to vaporize and insulation stays wet longer.

Accepted Answer

A)  100º C, 121º C 
B)  92º C, 116º C 
C)  114º C, 132º C 
D)  None of the above

Question 9

At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?

Accepted Answer

A)  Creep 
B)  Ductility 
C)  Softening 
D)  Hardening

Question 10

Galvanized steel components should not be welded to ________ due to LME.

Accepted Answer

A)  300 Series SS 
B)  400 Series SS 
C)  Carbon steel 
D)  Duplex SS

Question 11

Welds joining dissimilar materials (ferritic) may suffer __________ related damage at high temperatures due to differential thermal expansion stresses.

Accepted Answer

A)  Stress 
B)  Creep 
C)  Fatigue 
D)  Thermal stress

Question 12

Sulfidation of iron-based alloys usually begins at about:

Accepted Answer

A)  150 oF. 
B)  250 oF. 
C)  500 oF. 
D)  1100 oF.

Question 13

Non-stressed relieved __________ is susceptible to stress corrosion cracking when in contact with moist HF vapors in the presence of oxygen.

Accepted Answer

A)  Carbon steel 
B)  Alloy 400 
C)  300 Series SS 
D)  400 Series SS

Question 14

The best way to prevent 885º F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.

Accepted Answer

A)  Austenite 
B)  Martensite 
C)  Ferrite 
D)  Chromium

Question 15

________ has been a major problem on coke drum shells.

Accepted Answer

A)  Thermal fatigue 
B)  Stress cracking 
C)  Erosion 
D)  Temper embrittlement

Question 16

________ injection downstream of the desalter is another common method used to reduce the amount of HCl going overhead.

Accepted Answer

A)  Hydrogen 
B)  Nitrogen 
C)  Water 
D)  Caustic

Question 17

Sulfuric acid promotes general and localized corrosion of carbon steel. Carbon steel heat affected zones may experience severe corrosion. Acid concentration, temperature, alloy content and ____________ are critical factors affecting sulfuric acid corrosion.

Accepted Answer

A)  Pressure 
B)  Stress 
C)  Velocity 
D)  Ductility

Question 18

Blistering, HIC and SOHIC have been found to occur between ambient and ________.

Accepted Answer

A)  250º F 
B)  300º F 
C)  350º F 
D)  400º F

Question 19

In general, the resistance of iron and nickel based alloys to sulfidation is determined by the ________ content of the material.

Accepted Answer

A)  Chromium 
B)  Carbon 
C)  Molybdenum 
D)  Alloying

Question 20

Which of the following are affected by sulfidation?

Accepted Answer

A)  Carbon steel 
B)  300 Series SS 
C)  400 Series SS 
D)  All of the above

Exam 1: Corrosion and Materials

With sour water corrosion, at a given pressure, the H₂S concentration in the sour water _ as temperatures .

Titanium should not be used in known hydriding services such as _ or __.