Part(s) of a product that require specific operational control in service life; includes sealing surfaces and locations of high stress and strain under static and/or cycling loads.
Source: API Specification 16A, Specification for Drill-through Equipment, Fourth Edition, April 2017. Global Standards
Critical areas are locations vulnerable to substantial corrosion, buckling and/or fatigue cracking.
Source: Rules and Regulations for the Classification of Mobile Offshore Units, Part 1, Regulations, June 2013, Lloyd’s Register, Global Standards