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HTHA is dependant on temperature, hydrogen partial pressure, time and _________.
HTHA is dependant on temperature, hydrogen partial pressure, time and _________.A . PressureB . StressC . YieldD . Tensile strengthView AnswerAnswer: B
Start-up and shutdown of equipment increase the susceptibility of thermal fatigue. There is no set limit on temperature swings; however, as a practical rule, cracking may be suspected if the temperature swing exceeds about _________.
Start-up and shutdown of equipment increase the susceptibility of thermal fatigue. There is no set limit on temperature swings; however, as a practical rule, cracking may be suspected if the temperature swing exceeds about _________.A . 150º FB . 200º FC . 250º FD . 300º FView AnswerAnswer: B
Short term overheating is a permanent deformation occurring at relatively _________ stress levels as a result of localized overheating. This usually results in bulging and failure by stress rupture.
Short term overheating is a permanent deformation occurring at relatively _________ stress levels as a result of localized overheating. This usually results in bulging and failure by stress rupture.A . LowB . HighC . EvenD . None of the aboveView AnswerAnswer: A
Temperature, ________ and stress are critical factors of stress rupture. This is usually found in furnaces with coking tendencies and fired heater tubes.
Temperature, ________ and stress are critical factors of stress rupture. This is usually found in furnaces with coking tendencies and fired heater tubes.A . PressureB . DuctilityC . TimeD . Tensile strengthView AnswerAnswer: C
Steam blanketing is when the heat flow balance is disturbed; individual bubbles join to form a steam blanket, a condition known as Departure from Nucleate Boiling (DNB). Once a steam blanket forms, tube rupture can occur rapidly, as a result of _________.
Steam blanketing is when the heat flow balance is disturbed; individual bubbles join to form a steam blanket, a condition known as Departure from Nucleate Boiling (DNB). Once a steam blanket forms, tube rupture can occur rapidly, as a result of _________.A . Thermal fatigueB . Short term overheatingC ....
It is generally accepted that stresses approaching _________ are required for SCC to occur so that thermal stress relief is effective in preventing caustic SCC.
It is generally accepted that stresses approaching _________ are required for SCC to occur so that thermal stress relief is effective in preventing caustic SCC.A . MAWPB . YieldC . Creep rangeD . CriticalView AnswerAnswer: B
Nitriding begins above ________ and becomes severe above _______.
Nitriding begins above ________ and becomes severe above _______.A . 500º F, 800º FB . 600º F, 900º FC . 800º F, 1000º FD . 700º F, 1100º FView AnswerAnswer: B
In HF service, carbon steel forms a protective _________ scale in dry concentrated acid. Loss of the protective scale through high velocities or turbulence will result in greatly accelerated corrosion rates.
In HF service, carbon steel forms a protective _________ scale in dry concentrated acid. Loss of the protective scale through high velocities or turbulence will result in greatly accelerated corrosion rates.A . ChlorideB . FluorideC . Iron sulfideD . Iron oxideView AnswerAnswer: B
The major factors affecting high temperature sulfidation are the temperature, the presence of hydrogen, the H²S concentration and the ________.
The major factors affecting high temperature sulfidation are the temperature, the presence of hydrogen, the H²S concentration and the ________.A . PressureB . StressC . Alloy compositionD . VelocityView AnswerAnswer: C
Cooling water corrosion can result in many different forms of damage including general corrosion, pitting corrosion, ________, stress corrosion cracking and fouling.
Cooling water corrosion can result in many different forms of damage including general corrosion, pitting corrosion, ________, stress corrosion cracking and fouling.A . MICB . HICC . SOHICD . All of the aboveView AnswerAnswer: A
