API 571 Hydrochloric Acid (HCL) Corrosion

HCL Corrosion causes what kind of corrosion:

HCL corrosion affects what types of materials?

Which process areas are most susceptible to HCL corrosion?
A) Boilers
B) Distillation Overhead Systems
C) Desalters
D) Vacuum Flasher Bottoms
E) Hydrotreater Reactors

HCL Corrosion normally occurs as:
A) Fatigue
B) Isolated Pittin
C) Dew-point corrosion
D) Erosion

The severity of HCL corrosion increase as the HCL concentration increases and the temperature:

Hydrochloric acid can form when HCL comes into contact with what?

Rapid HCL corrosion begins to occur if the pH drops below:
A) 7.0
B) 4.5
C) 11.5
D) 2.0

Which materials are generally less susceptible to HCL corrosion?
A) 400 series SS and titanium
B) Aluminum and Titanium
C) Chrome alloys
D) Alloy 400 and Titanium
E) 300 series SS and 400 series SS

HCL corrosion typically occurs in which process units?
A) Crude and Catalytic Reforming Unit
B) Crude Unit and Catalytic Cracking Unit
C) Sulfur Recovery Unit and Thermal Cracking Unit
D) Catalytic Cracking Unit and Benzene Extracting Unit

HCL Corrosion in 400 Series SS will appear as:
A) Cracking or pitting
B) Pitting
C) uniform corrosion
D) Cracking

HCL Corrosion in 300 series SS will appear as:
A) Uniform Corrosion
B) Cracking
C) Pitting
D) Cracking or pitting

Which of the following is NOT a method to reduce the risk of HCL corrosion in the Crude Unit Overhead System?
A) Upgrade materials to Titanium or nickel alloys
B) Water washing - Add water to dilute the acid
C) Caustic injection to neutralize the acid
D) Steam Injection to dilute the acid

In the Crude Unit, one of the checks for the potential of HCL corrosion is to determine the chloride content of the Overhead Accumulator. A common chloride limit is:

HCL Corrosion can create highly localized corrosion in areas where:
A) The pH exceeds 10.5
B) Dry hydrogen meets light hydrocarbon
C) The temperature exceeds 120°F
D) water with chloride is condensing (vapor to liquid)