HCL acid corrosion is found in several units, especially _______ and ________, units, hydroprocessing units and catalytic reformer units.

A. Amine, crude

B. Crude, Alkylation

C. Vacuum, Amine

D. Crude, Vacuum

All ________ based materials and low alloy materials, 300 Series SS and 400 Series SS are susceptible to Sulfidation.

A. Carbon

B. Steel

C. Chromium

D. Iron

At elevated temperatures, dissimilar weld metal cracking is aggravated by the diffusion of carbon out of the weld metal and into the base metal. The temperature at which carbon diffusion becomes a concern is above ________.

A. 700º F

B. 750º F

C. 800º F

D. 900º F

A 5Cr-1Mo piping system in the hydrogen unit shows significant internal wall loss after 2 years in service due to CO?corrosion. Which material would be best suited to use to install a new pipe system?

A. Titanium

B. 9Cr-1Mo

C. A-106 Gr B

D. 316 SS

A form of thermal cracking, __________, can occur when high and nonuniform thermal stresses develop over a relatively short period of time in a piece of equipment due to differential expansion and contraction.

A. Thermal expansion

B. Thermal stress

C. Thermal shock

D. Linear expansion

The accepted way to test for temper embrittlement is ________.

A. Impact testing

B. Metallographic

C. RT

D. UT Shear wave

Low creep ductility is __________ severe in high tensile strength materials and welds.

A. More

B. Less

C. Usually

D. Not

The best method to inspect for SCC is ____.

A. WFMT

B. UT Shear wave

C. AET

D. All of the above

Which of the following can be affected by 885º F Embrittlement?

A. 410 SS

B. 430 SS

C. 308 SS

D. Alloy 2205

E. A, B and D

Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called ______. It is most often found in heavy wall sections.

A. Thermal cracking

B. Reheat cracking

C. Step-like cracking

D. None of the above

Which of the following is not a major factor associated with boiler water condensate corrosion?

A. Operating pressure

B. Oxygen content

C. Carbon dioxide content

D. Process ph

E. Temperature

Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small amount of _________ can lead to very aggressive corrosion.

A. Ammonium chloride

B. Amine

C. Water

D. Salt

________ is a form of carbon that may promote carburization, particularly during decoke cycles where temperatures exceed the normal operating temperatures.

A. Carbonic acid

B. Coke

C. Crude oil

D. None of the above

With thermal fatigue, time to failure is a function of the magnitude of the stress and the number of cycles and decreases with _________ stress and ________ cycles.

A. Increasing, Decreasing

B. Increasing, Increasing

C. Decreasing, Decreasing

D. Decreasing, Increasing

________ and _______ damage develop without applied or residual stress so that PWHT will not prevent them from occurring.

A. SOHIC, Blistering

B. SCC, SOHIC

C. HIC, SCC

D. Blistering, HIC