API-571 exam

Sulfidation is also known as ____________.A . Sulfur corrosionB . Sulfate corrosionC . Sulfidic corrosionD . None of the aboveView AnswerAnswer: C

Which of these materials are not susceptible to Spheroidization?A . Carbon steelB . 9Cr-1MoC . 316 SSD . Both A and BView AnswerAnswer: C

Cracking of dissimilar weld metals occurs on the _________ side of a weld between an austenitic and a Ferritic material operating at high temperatures.A . AusteniticB . FerriticC . AnodicD . CathodicView AnswerAnswer: B

________ of a component is the most important factor in determining a components resistance to mechanical fatigue.A . DesignB . TemperatureC . StressD . PressureView AnswerAnswer: A

Stresses acting on the weldments are significantly ________ when austenitic stainless steel filler metal is used. A nickel based filler metal has a coefficient of thermal expansion closer to carbon steel resulting in significantly lower stress at elevated temperatures.A . LowerB . HigherC . AlteredD . None of the aboveView...

For pressure vessels, inspection should focus on welds of ________ operating in the creep range.A . CrMo alloysB . Carbon steelC . Stainless steelD . Low hydrogen electrodesView AnswerAnswer: A

Carbon steel is susceptible to SCC when used in ___________ service.A . HydrogenB . AmmoniaC . High temperatureD . High pressureView AnswerAnswer: B

Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.A . H²OB . H²SC . CO²D . O²View AnswerAnswer: C

__________ testing is the best method to determine the susceptibility of a material to hydrogen stress cracking.A . HardnessB . AcousticC . SWUTD . AUTView AnswerAnswer: A

A 5Cr-1Mo piping system in the hydrogen unit shows significant internal wall loss after 2 years in service due to CO² corrosion. Which material would be best suited to use to install a new pipe system?A . TitaniumB . 9Cr-1MoC . A-106 Gr BD . 316 SSView AnswerAnswer: D