Inspection Practices for Pressure Vessels

3.1.4 corrosion specialist
A person, acceptable to the owner/user, who has knowledge and experience in
corrosion damage mechanisms, metallurgy, materials selection, and corrosion
monitoring techniques.
3.1.5 corrosion under insulation CUI
Corrosion that occurs under insulation, including stress corrosion cracking under
insulation.
3.1.6 damage (or deterioration/degradation) mechanism
A process that induces deleterious micro and/or macro material changes over time
that is harmful to the material condition or mechanical properties. Damage
mechanisms are usually incremental, cumulative, and unrecoverable. Common
damage mechanisms include corrosion, stress corrosion cracking, creep, erosion,
fatigue, fracture, and thermal aging.
3.1.7 defect
An imperfection, whose type or size, exceeds the applicable acceptance criteria.
Fion Zhang/ Charlie Chong