API-571 無料問題集「API Corrosion and Materials Professional」

（A）Sulfide cracking corrosion

（B）High-temperature corrosion

（C）Localized erosion-corrosion

（D）General or uniform corrosion

（A）alkaline sour water.

（B）amine solutions above 250°F (121°C).

（C）amine concentration.

（D）dissolved acid gases.

（A）Sodium sulfites or hydrazines

（B）Dissolved iron oxides

（C）High pH from water treatment problems

（D）Carbon dioxide and oxygen

（A）Lower the water velocity

（B）Increase the process side temperature above 212°F (100°C)

（C）Upgrade the metallurgy of the exchanger

（D）Increase the tube diameter

（A）Type 304L stainless steel

（B）9 Cr low-alloy steel

（C）Alloy 800H

（D）Type 310 stainless steel

（A）Inadequately heat-treated 1.25 Cr-0.5 Mo low-alloy steel

（B）Non-stress-relieved admiralty brass U-bends

（C）Non-stress-relieved 304 stainless steel

（D）Non-postweld heat-treated carbon steel

（A）Controlled rates of heating and cooling during startup and shutdown can lower stresses

（B）Visual examination is an ineffective method of monitoring thermal fatigue

（C）Because of their ductility, carbon steels have lower resistance to thermal fatigue

（D）Thermal fatigue cracks generally initiate on the interior of a component due to high thermal stress

（A）Using low-chloride insulation

（B）Using appropriate coatings

（C）Maintaining process temperatures at the boiling point of water

（D）Implementing a carefully planned, periodic inspection program

（A）mechanical fatigue.

（B）original weld defect.

（C）sulfide stress cracking.

（D）thermal overload.

（A）Water vapor in the hydrocarbon phase

（B）Localized zones of weld HAZ hardness above 200 HB

（C）Absorption and permeation of hydrogen

（D）pH of <7 with dissolved H#S present