Question 1

Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF). Time-to-failure decreases as the hardness increases.

Accepted Answer

A)  225 BHN 
B)  237 BHN 
C)  241 BHN 
D)  247 BHN

Question 2

Amine cracking is ________ likely to occur in lean MEA and DEA services than in MDEA and DIPA services.

Accepted Answer

A)  More 
B)  Less 
C)  As 
D)  None of the above

Question 3

With sour water corrosion, corrosion increases with __________ NH4HS concentration and __________ velocity.

Accepted Answer

A)  Increasing, Decreasing 
B)  Increasing, Increasing 
C)  Decreasing, Decreasing 
D)  Decreasing, Increasing

Question 4

_________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.

Accepted Answer

A)  Hydrate corrosion 
B)  Carbide corrosion 
C)  Spheroidization 
D)  Metal dusting

Question 5

What is the chemical symbol for propane or propylene?

Accepted Answer

A)  C₂ 
B)  C3 
C)  C4 
D)  CH4

Question 6

ASME Section VIII had few limitations concerning brittle fracture prior to:

Accepted Answer

A)  1955. 
B)  1962. 
C)  1973. 
D)  1987.

Question 7

Cavitation is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles. Temperatures approaching the boiling point of the liquid are _________ to result in bubble formation.

Accepted Answer

A)  Less likely 
B)  More likely 
C)  Not likely 
D)  None of the above

Question 8

Which of the following materials are subject to mechanical fatigue?

Accepted Answer

A)  Carbon steels 
B)  Stainless steels 
C)  Low alloy steels 
D)  All of the above

Question 9

_________ is accelerated high temperature wastage of materials that occurs when contaminants in the fuel form deposits and melt on the metal surfaces.

Accepted Answer

A)  Spheroidization 
B)  Dealloying 
C)  Fuel ash corrosion 
D)  None of the above

Question 10

What standard refers to Fitness-For-Service evaluations?

Accepted Answer

A)  RP 581 
B)  RP 579 
C)  RP 588 
D)  RP 568

Question 11

The "L" grade of stainless steels will sensitize if exposed more than several hours above _______ or long term above _____.

Accepted Answer

A)  1200º F, 800º F 
B)  1000º, 600º F 
C)  1000º F, 750º F 
D)  1100º F, 800º F

Question 12

_________ of the amine system is the most effective way to prevent amine corrosion.

Accepted Answer

A)  Proper concentration 
B)  Proper operation 
C)  Proper design 
D)  Proper startup

Question 13

SCC generally occurs below about _______.

Accepted Answer

A)  150º F 
B)  180º F 
C)  210º F 
D)  240º F

Question 14

Which of the following materials is susceptible to CO₂ corrosion?

Accepted Answer

A)  Carbon steel 
B)  Stainless steel 
C)  Duplex stainless steel 
D)  Both B and C

Question 15

Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).

Accepted Answer

A)  Oxide 
B)  Sulfide scale 
C)  Sulfate scale 
D)  Caustic scale

Question 16

Stresses acting on the weldments are significantly ________ when austenitic stainless steel filler metal is used. A nickel based filler metal has a coefficient of thermal expansion closer to carbon steel resulting in significantly lower stress at elevated temperatures.

Accepted Answer

A)  Lower 
B)  Higher 
C)  Altered 
D)  None of the above

Question 17

With sour water corrosion, streams with a pH below ________ indicate the presence of a strong acid.

Accepted Answer

A)  7.0 
B)  5.5 
C)  6.0 
D)  4.5

Question 18

Cooling water corrosion is a concern with water-cooled __________ and cooling towers in all applications across all industries.

Accepted Answer

A)  Pumps 
B)  Vessels 
C)  Piping 
D)  Exchangers

Question 19

HTHA is dependant on temperature, hydrogen partial pressure, time and _________.

Accepted Answer

A)  Pressure 
B)  Stress 
C)  Yield 
D)  Tensile strength

Question 20

Corrosion from oxygen tends to be __________ type damage and can show up anywhere even if only very small amounts break through the scavenging system.

Accepted Answer

A)  General 
B)  Localized 
C)  Pitting 
D)  Cracking

Exam 1: Corrosion and Materials

Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF) . Time-to-failure decreases as the hardness increases.