Atmospheric Corrosion

Question 1

1. Atmospheric Corrosion is of greatest concern in:

A. dry climates in rural locations
B. dry climates in industrial locations
C. wet climates in rural locations
D. wet climates in industrial locations

Answer 1

D. wet climates in industrial locations

Question 2

2. Which of the following materials is LEAST affected by Atmospheric Corrosion?

A. Carbon Steel
B. Chromes
C. Stainless steels
D. Copper alloyed with aluminum C

Answer 2

C. Stainless steels

Question 3

3. Which of the following are contaminants that could cause Atmospheric Corrosion? (Open Books) * This may have more than one correct answer, please select all answers that apply

A. Fly Ash
B. H2S
C. Hydrogen
D. Nitrogen
E. Propane compounds
F. Salts
G. Sulfur Compounds

Answer 3

A. Fly Ash
B. H2S
F. Salts
G. Sulfur Compounds

Question 4

4. On bare surfaces, the rate of Atmospheric Corrosion generally increases up to what temperature?

A. 150°F
B. 200 °F
C. 250 °F
D. 350 °F

Answer 4

C. 250 °F

Question 5

5. List the approximate corrosion rate from Atmospheric Corrosion based on the following conditions. (Open Book)

A. Dry rural environments _______ mpy
B. Inland locations with moderate humidity or rainfall ______mpy
C. Industrial areas with airborne acids/sulfur compunds _____mpy
D. Marine environments _____mpy

Answer 5

A. <1 mpy
B. 1-3 mpy
C. 5-10 mpy
D. 20 mpy

Question 6

6. Which of the following does NOT increase the likelihood of Atmospheric Corrosion?

A. Bird droppings
B. Increasing annual rainfalls
C. Locations where moisture is trapped
D. Increasing operating pressures
E. Increasing amounts of airborne contaminants

Answer 6

D. Increasing operating pressures

Question 7

7. Certain equipment types can generate down-stream conditions that can cause Atmospheric Corrosion. Which types of equipment can cause these conditions? *This may have more than one correct answer, please select all answers that apply

A. Cooling Water Towers
B. Flare Stack
C. Gasoline Tank
D. Wet Gas Scrubber

Answer 7

A. Cooling Water Towers
D. Wet Gas Scrubber

Question 8

8. A key place for Atmospheric Corrosion is:
   A. on piping systems that operate above 250°F
   B. where piping rests on a pipe support
   C. on the top side of an uncoated pipe
   D. on insulated and uncoated vessels in Arizona

Answer 8

B. where piping rests on a pipe support

Question 9

9. Atmospheric Corrosion:
   A. can cause either uniform or localized wall loss
   B. always causes localized wall loss
   C. always causes uniform wall loss
   D. is best detected using profile RT

Answer 9

A. can cause either uniform or localized wall loss

Question 10

10. The best way to prevent failures by Atmospheric Corrosion is to:

A. Have an aggressive inspection program
B. reduce airborne particulates
C. install and maintain appropriate coatings
D. shoot all birds that cross the plant fence
E. build new petrochemical facilities in a dry desert

Answer 10

C. install and maintain appropriate coatings

Question 11

11. Which of the following NDE methods is NOT used during inspection for atmospheric corrosion?

A. MT
B. RT
C. UT
D. VT

Answer 11

A. MT