API 571 ACTUAL STUDY GUIDE FOR API
570 EXAM 2025 LATEST UPDATED,
DISTINCTION GRADE BOOSTER
What does "L" mean in Austentic SS, like 304L?
A) Has a low carbon content
B) has a low chrome content
C) has a low nickel level
D) has a low toughness level
E) is lousy steel - - ANSWER A
What does "H" mean in Austenitic SS, like 316 H?
A) Has a high carbon content
B) has a high chrome content
C) has a high nickel level
D) has a high toughness level
E) is horrible steel - - ANSWER A
Which of the following is NOT a critical factor contributing to Sour Water
Corrosion?
a) pH
b) temperature
c) Pressure.
,d) H2S Concentration - - ANSWER C
Which of the following process chemicals is a critical factor contributing to Sour
Water Corrosion?
a) carbon
b) hydrogen
c) Oxygen.
d) Sulfur
e) vanadium - - ANSWER C
At what pH does a thin iron sulfide layer deposit on the steel and provides some
protection to corrosion?
a) >4.5 pH
b) <4.5 pH
c) >7.0 pH
d) <7.0pH - - ANSWER A
Which process areas are most susceptible to Sour Water Corrosion?
a) boilers
b) desalters
c) hydrotreater reactors
d) Overhead systems.
e) Vacuum flashers - - ANSWER D
Sour Water Corrosion typically appears as:
,a) A change in mechanical properties
b) A crack
c) General wall loss.
d) Localized thinned areas
e) A pit - - ANSWER C
Sour Water Corrosion can cause localize corrosion is:
a) Nickel content in steel exceeds 30%
b) Oxygen is present.
c) pH is less than 2.4
d) temperature exceeds 400°F
e) velocity is less than 2 fps - - ANSWER B
Which materials are generally NOT susceptible to Acid Sour Water Corrosion?
a) Chromes
b) Copper alloys
c) Nickel alloys
d) Copper and Nickel Alloys.
e) Chrome and Nickel alloys - - ANSWER D
Amine Stress Corrosion Cracking affects:
a) aluminums
b) Carbon steels and low alloys.
c) 300 series stainless steels
, d) Most plant construction materials - - ANSWER B
Which of the following is NOT a factor in Amine Stress Corrosion Cracking?
a) Amine concentration
b) temperature
c) tensile stress
d) Fluid velocity. - - ANSWER D
Amine Stress Corrosion Cracking normally occurs in:
a) 300 series SS
b) boilers
c) hydro-treaters
d) Non-stressed relieved CS. - - ANSWER D
Amine Stress Corrosion Cracking normally occurs in:
a) Lean amine. 5.1.2.2.3.e
b) Rich amine
c) Pure amine
d) Low temperature amine - - ANSWER A
A common way for Amine Stress Corrosion Cracking to occur is by:
a) Increasing the amine concentration
b) Increasing the amine velocity
c) Steaming out amine piping/equipment during an outage.
570 EXAM 2025 LATEST UPDATED,
DISTINCTION GRADE BOOSTER
What does "L" mean in Austentic SS, like 304L?
A) Has a low carbon content
B) has a low chrome content
C) has a low nickel level
D) has a low toughness level
E) is lousy steel - - ANSWER A
What does "H" mean in Austenitic SS, like 316 H?
A) Has a high carbon content
B) has a high chrome content
C) has a high nickel level
D) has a high toughness level
E) is horrible steel - - ANSWER A
Which of the following is NOT a critical factor contributing to Sour Water
Corrosion?
a) pH
b) temperature
c) Pressure.
,d) H2S Concentration - - ANSWER C
Which of the following process chemicals is a critical factor contributing to Sour
Water Corrosion?
a) carbon
b) hydrogen
c) Oxygen.
d) Sulfur
e) vanadium - - ANSWER C
At what pH does a thin iron sulfide layer deposit on the steel and provides some
protection to corrosion?
a) >4.5 pH
b) <4.5 pH
c) >7.0 pH
d) <7.0pH - - ANSWER A
Which process areas are most susceptible to Sour Water Corrosion?
a) boilers
b) desalters
c) hydrotreater reactors
d) Overhead systems.
e) Vacuum flashers - - ANSWER D
Sour Water Corrosion typically appears as:
,a) A change in mechanical properties
b) A crack
c) General wall loss.
d) Localized thinned areas
e) A pit - - ANSWER C
Sour Water Corrosion can cause localize corrosion is:
a) Nickel content in steel exceeds 30%
b) Oxygen is present.
c) pH is less than 2.4
d) temperature exceeds 400°F
e) velocity is less than 2 fps - - ANSWER B
Which materials are generally NOT susceptible to Acid Sour Water Corrosion?
a) Chromes
b) Copper alloys
c) Nickel alloys
d) Copper and Nickel Alloys.
e) Chrome and Nickel alloys - - ANSWER D
Amine Stress Corrosion Cracking affects:
a) aluminums
b) Carbon steels and low alloys.
c) 300 series stainless steels
, d) Most plant construction materials - - ANSWER B
Which of the following is NOT a factor in Amine Stress Corrosion Cracking?
a) Amine concentration
b) temperature
c) tensile stress
d) Fluid velocity. - - ANSWER D
Amine Stress Corrosion Cracking normally occurs in:
a) 300 series SS
b) boilers
c) hydro-treaters
d) Non-stressed relieved CS. - - ANSWER D
Amine Stress Corrosion Cracking normally occurs in:
a) Lean amine. 5.1.2.2.3.e
b) Rich amine
c) Pure amine
d) Low temperature amine - - ANSWER A
A common way for Amine Stress Corrosion Cracking to occur is by:
a) Increasing the amine concentration
b) Increasing the amine velocity
c) Steaming out amine piping/equipment during an outage.
