API 510 Material Evaluation and Selection

Question 1

Why is material identification important for pressure vessel inspection?

Accepted Answer

To verify the correct material was used and ensure compatibility with service conditions

Answer

Material identification verifies that construction materials meet specifications and are compatible with the operating environment and contained media.

Question 2

What is positive material identification (PMI)?

Accepted Answer

Field testing to verify the chemical composition of installed materials

Answer

PMI uses portable analyzers to verify the actual chemical composition of materials, ensuring they match specifications.

Question 3

Which material property is most critical for pressure vessel service at elevated temperatures?

Accepted Answer

Creep resistance and elevated temperature strength

Answer

At elevated temperatures, materials must resist creep deformation and maintain sufficient strength to safely contain pressure.

Question 4

What is hydrogen-induced cracking and why is it a concern for pressure vessels?

Accepted Answer

Hydrogen atoms diffuse into steel, causing embrittlement and cracking under stress

Answer

Hydrogen atoms can diffuse into steel at high temperatures and pressures, causing embrittlement and cracking that can lead to catastrophic failure.

Question 5

What is the purpose of hardness testing during pressure vessel inspection?

Accepted Answer

To assess material condition and detect changes from original properties

Answer

Hardness testing assesses material condition, detecting changes from heat treatment, service exposure, or welding that could affect mechanical properties.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Material Evaluation and Selection