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

（A）Using carbon or low-alloy steels

（B）Postweld heat treatment (PWHT)

（C）Frequent inspection of the piping or equipment involved

（D）Using thicker construction materials to lower the resulting stress

（A）Chromium

（B）Nickel

（C）Manganese

（D）Niobium

（A）Caustic injections in crude units

（B）Caustic storage tanks (non-postweld heat treated)

（C）Caustic treaters

（D）Boilers and steam generating equipment

（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）Hardness of the furnace outlet piping

（B）Surface exfoliation of furnace tubes

（C）Hot/cold injection points

（D）Bulging at elbows

（A）condensate corrosion.

（B）thermal fatigue.

（C）CO2 corrosion.

（D）carbonic acid corrosion.

（A）exposure time and stress.

（B）temperature and pressure.

（C）temperature and microstructure.

（D）type of steel and H# partial pressure.

（A）12%

（B）35%

（C）20%

（D）45%

（A）Thermal fatigue

（B）Injection point corrosion

（C）Hydrogen embrittlement

（D）Mixing point corrosion

（A）At the toe of the weld in the heat-affected zone of the austenitic material.

（B）In the parent metal on the austenitic side of the weld.

（C）In the center of the dissimilar weld.

（D）At the toe of the weld in the heat-affected zone of the ferritic material.