Phosphoric acid corrosion in polymerization units is usually found under what circumstances?
Temper embrittlement is a metallurgical change that is:
Naphthenic acid corrosion (NAC) is most severe in what phase of flow?
The likelihood of brittle fracture is best lessened by:
Which of the following is the main concern for the potential of brittle fracture in typical process service?
Which of the following is the most significant result of spheroidization in steels?
What damage mechanism can occur in wet H₂S environments and is sometimes confused with wet H₂S damage?
The potential for galvanic corrosion will increase when:
Damage from oxidation is usually determined by:
The form of corrosion most often caused by sulfidation is typically described as:
(Repeated) The best method for finding damage from sigma phase embrittlement is:
Carbonate stress corrosion cracking and alkaline stress corrosion cracking are:
Which of the following statements is most accurate with regard to thermal fatigue?
Which of the following is considered resistant to cracking in hydrofluoric acid service?
The primary cause of ammonium chloride corrosion is the formation of salts:
Which of the following damage mechanisms is related to steel hardness?
Which type of corrosion is most likely to occur in hydroprocess reactor effluent streams in units producing alkaline sour water?
Which of the following is the lowest threshold temperature at which creep damage is a concern in carbon steel with tensile strength > 60ksi (414 MPa)?
Microbiologically induced corrosion is largely independent of the:
Which of the following is a critical factor for chloride stress corrosion cracking?
Aggressive ammonium chloride corrosion often occurs:
Both sulfide stress corrosion cracking and stress-oriented hydrogen-induced cracking are most often found in:
In a naphthenic acid corrosive (NAC) environment, what is the effect of sulfur?
In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?
Which of the following is related to all wet H₂S damage mechanisms?
Metal dusting usually occurs in the operating temperature range of:
Which of the following statements about high-temperature hydrogen attack is most accurate?
Spheroidization is a change in the microstructure of steels that can occur after exposure to a minimum temperature of:
Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF) acid corrosion?
The presence of which additional substance(s) will accelerate the corrosion of steel in the presence of sulfur compounds at high temperature?
What is the most effective way to mitigate aqueous organic acid corrosion in overhead streams?
An inspector has discovered significant cracking in a T-joint where hot and cold hydrogen-containing streams are mixing in a hydroprocess unit. What damage mechanism should the inspector suspect is the cause?
Why are high-cycle fatigue cracks difficult to detect with nondestructive examination (NDE)?