API-571 exam

Ferritic stainless steels are usually not used in __________ applications.A . Non-pressure boundaryB . Pressure boundaryC . High temperatureD . Low temperatureView AnswerAnswer: B

HCL acid corrosion is found in several units, especially _______ and ________, units, hydro processing units and catalytic reformer units.A . Amine, crudeB . Crude, AlkylationC . Vacuum, AmineD . Crude, VacuumView AnswerAnswer: D

____________ is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid service.A . Sulfide stress crackingB ....

Areas of vulnerability in sulfuric acid Alkylation units include reactor effluent lines, reboilers, deisobutanizer, overhead systems and the _________ treating system.A . CausticB . Sulfuric acidC . CatalystD . H²SView AnswerAnswer: A

High temperature H² / H²S corrosion damage is minimized by using alloys with high _________ content.A . CarbonB . MolybdenumC . ChromiumD . StainlessView AnswerAnswer: C

Which if the following materials are not susceptible to hydrogen stress cracking?A . Carbon steelB . Low alloy steelC . Stainless steelD . None of the aboveView AnswerAnswer: C

Alloys with nickel content above _________ are highly resistant to Cl SCC. The greatest susceptibility is 8% to 12% nickel.A . 15%B . 20%C . 30%D . 35%View AnswerAnswer: D

Soil corrosion of carbon steel can be minimized through the use of special backfill, coatings and _______.A . Cathodic protectionB . ResistivityC . TemperatureD . None of the aboveView AnswerAnswer: A

Steel cleanliness and _______ have a significant influence on toughness and resistance to brittle fracture.A . CompositionB . AlloyC . Grain sizeD . None of the aboveView AnswerAnswer: C

Carburization can be confirmed by substantial increases in _______ and loss of __________.A . HardnessB . Tensile StrengthC . DuctilityD . A and BE . A and CView AnswerAnswer: E