API 571 Corrosion and Materials Professional Exam Prep FREE Sample Exam

Chloride stress corrosion cracking of a stainless exchanger belongs in which category?

Uniform or localized thickness loss

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High-temperature corrosion

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Environment-assisted cracking

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Mechanical and metallurgical failure

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What does HTHA stand for?

High Temperature Hydrogen Attack – reaction of hydrogen with carbon in steel at elevated temperature and hydrogen partial pressure, forming methane and decarburizing the steel

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Hydrothermal Thinning by Acid at ambient temperature

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Hydrogen Trapping in Hydrided Alloys at room temperature only

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High Tensile Heat Affected zone cracking

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How does prior temper embrittlement feed brittle fracture risk?

It lowers the transition temperature

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It removes all flaws from the vessel

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It raises the transition temperature, so a vessel can be in the brittle regime at temperatures that were once acceptable

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It increases impact toughness

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Monitoring most helpful for detecting conditions leading to steam blanketing includes:

Pump net positive suction head calculations only

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Vibration monitoring of small-bore piping only

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Circulation, flow, and tube temperature monitoring in boiler circuits

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Elbow thickness surveys in gas lines

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What morphology is characteristic of metal dusting?

A uniform soft ferrite skin

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A smooth hard nitride case with no metal loss

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Deep, localized pits and rapid wastage, often with coke deposits and metal powder or dust at the attack site

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Thick glassy ash deposits

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What is the primary alloying defense against high-temperature oxidation?

Increasing carbon content, which hardens the surface against oxygen

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Increasing chromium content, which forms a more protective, slower-growing oxide scale

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Adding sulfur to form a protective sulfide layer

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Removing chromium so iron oxide can form freely

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A plant proposes raising caustic strength in a carbon steel system without stress relief. What is the appropriate integrity response?

Evaluate caustic SCC susceptibility for the new concentration and temperature and consider stress relief, material, and controls before operating

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Assume dilute-service history guarantees safety at any concentration

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Only check the pump capacity

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Approve automatically because carbon steel is immune to caustic

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Which stress condition can drive chloride SCC even when operating pressure stress is low?

Purely compressive stress from external supports

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No stress is needed if chlorides are present

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Hydrostatic test water pressure after the equipment is drained and dried

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Residual tensile stress from welding, forming, or cold work

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A new inspector asks which single change of service would most increase amine corrosion in an existing carbon steel line. Which answer is best?

Switching the line to dry gas service with no liquid amine

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Switching the line from lean-amine service to hot rich-amine service at higher velocity

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Lowering the acid gas loading and temperature in the line

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Putting the line in stagnant lean-amine storage service

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What mitigation besides metallurgy and wash water helps control bisulfide corrosion?

Deliberately increasing salt concentration

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Removing ammonia and sulfide monitoring

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Allowing repeated dry-out of effluent tubes

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Controlling velocity and maintaining effective wash water distribution and quantity

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How does water availability change hydrochloric acid corrosion in an overhead vapor line?

Water prevents hydrochloric acid corrosion completely

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Corrosion becomes severe where water condenses; dry vapor alone is much less corrosive to steel

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Dry hydrogen chloride gas corrodes faster than aqueous acid in all cases

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Water turns hydrogen chloride into a protective coating

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Applied choice: For a damage-mechanism review, a team must decide which circuits get detailed HTHA screening. Which selection rule is most defensible?

Screen circuits chosen by alphabetical order until the budget runs out

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Screen only circuits that have already leaked

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Screen only the newest circuits, because older ones have proven themselves

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Screen every steel circuit where metal temperature and hydrogen partial pressure could approach or exceed the alloy's limit, including during credible excursions, and document why other circuits are excluded

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API 571 Corrosion and Materials Professional Exam Prep FREE Sample Exam — Fixed Set

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