API Corrosion and Materials Professional API-571 Question # 15 Topic 2 Discussion
API-571 Exam Topic 2 Question 15 Discussion:
Question #: 15
Topic #: 2
(In an RBI assessment, sulfidation was identified as a credible damage mechanism and assigned a corrosion rate of 8 mpy (0.20 mm/yr). Which of the following are critical factors in sulfidation?)
A.
Concentration of sulfur species and operating temperature
B.
Operating temperature and corrosion rate
C.
Concentration of sulfur species, operating temperature, and metallurgy
D.
Corrosion rate and concentration of sulfur species
Comprehensive and Detailed Explanation From Exact Extract:
Per API RP 571, sulfidation corrosion is controlled by three primary variables:
Sulfur species concentration (e.g., H₂S, sulfur compounds)
Operating temperature
Metallurgy, especially chromium content
Chromium significantly improves sulfidation resistance by forming protective sulfide scales. All three factors must be considered in RBI assessments.
Referenced Documents (Study Basis):
API RP 571 – Section on Sulfidation Corrosion
======================
Contribute your Thoughts:
Chosen Answer:
This is a voting comment (?). You can switch to a simple comment. It is better to Upvote an existing comment if you don't have anything to add.
Submit