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API 570 (3.1.22) Defect An imperfection of a type or magnitude exceeding the acceptance criteria. #ipetro #careergrowth

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API 570 (3.1.21) Deadlegs Components of a piping system that normally have little or no significant flow. Some examples include blanked (blinded) branches, lines with normally closed block valves, lines with one end blanked, pressurized dummy support legs, stagnant control valve bypass piping, spare pump piping, level bridles, pressure relieving device inlet and outlet header piping, pump trim bypass lines, high-point vents, sample points, drains, bleeders, and instrument connections. Deadlegs also include piping that is no longer in use but still connected to the process. #ipetro #careergrowth

API 570 (3.1.20) Damage Rate The rate of deterioration other than corrosion, i.e. rate of cracking, rate of HTHA, creep rate, etc. #ipetro #careergrowth

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API 570 (3.1.19) Damage Mechanism Any type of deterioration encountered in the refining and chemical process industry that can result in metal loss flaws/defects that can affect the integrity of piping systems (e.g. corrosion; cracking; erosion; dents; and other mechanical, physical, or chemical impacts). See API 571 for a comprehensive list and description of damage mechanisms that may affect process piping systems in the refining, petrochemical and chemical process industries. #ipetro #careergrowth

API 570 (3.1.18) Cyclic Service Refers to service conditions that may result in cyclic loading and produce fatigue damage or failure (e.g. cyclic loading from pressure, thermal, and/or mechanical loads). Other cyclic loads associated with vibration may arise from such sources as impact, turbulent flow vortices, resonance in compressors, and wind, or any combination thereof. Also see API/ASME 579-1/ASME FFS-1, Definition of Cyclic Service, in Section I.13 and screening methods in Annex B1.5, as well as the definition of “severe cyclic conditions” in ASME B31.3 Section 300.2, Definitions. #ipetro #careergrowth

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API 570 (3.1.17) Critical Check Valves Check valves in piping systems that have been identified as vital to process safety (see 5.13). Critical check valves are those that need to operate reliably in order to avoid the potential for hazardous events or substantial consequences should reverse flow occur. #ipetro #careergrowth

API 570 (3.1.16) Corrosion Under Insulation (CUI) External corrosion of carbon steel and low alloy steel piping resulting from water trapped under insulation. External chloride stress corrosion cracking (ECSCC) of austenitic and duplex stainless steel under insulation is also classified as CUI damage. #ipetro #careergrowth