Definition(s)
Material degradation due to operation
Material degradation due to operation is defined as loss of material strength, ductility, or toughness due to creep, graphitization, temper embrittlement, hydrogen attack, fatigue, etc., see API RP 579.
Source: API 510, Pressure Vessel Inspection Code: In-Service Inspection, Rating, Repair, and Alteration Downstream Segment, Ninth Edition, June 2006. Global Standards