What type of corrosion is particularly a concern in sour service conditions?

What type of corrosion is particularly a concern in sour service conditions?

• A. Pitting corrosion
• B. Hydrogen-induced cracking
• C. Uniform corrosion
• D. Stress corrosion cracking

Answer: (B)

In sour service conditions, hydrogen-induced cracking (HIC) is a significant concern due to the presence of hydrogen sulfide (H2S), which can lead to the formation of atomic hydrogen. This atomic hydrogen can penetrate the steel and combine with the iron in the metal, resulting in internal damage and the formation of cracks. These conditions make materials more susceptible to HIC, particularly in environments with high pressures and temperatures associated with sour service. Being aware of HIC is crucial for pressure vessel inspectors, as it can compromise the structural integrity of vessels, leading to potential failures. Therefore, understanding the mechanisms behind hydrogen-induced cracking in sour service helps in both inspection protocols and material selection, ultimately ensuring safety and reliability in operations involving these corrosive environments.

In sour service conditions, hydrogen-induced cracking (HIC) is a significant concern due to the presence of hydrogen sulfide (H2S), which can lead to the formation of atomic hydrogen. This atomic hydrogen can penetrate the steel and combine with the iron in the metal, resulting in internal damage and the formation of cracks. These conditions make materials more susceptible to HIC, particularly in environments with high pressures and temperatures associated with sour service.

Being aware of HIC is crucial for pressure vessel inspectors, as it can compromise the structural integrity of vessels, leading to potential failures. Therefore, understanding the mechanisms behind hydrogen-induced cracking in sour service helps in both inspection protocols and material selection, ultimately ensuring safety and reliability in operations involving these corrosive environments.