API-571 Exam Question 191
_____________ usually occurs when a colder liquid contacts a warmer metal surface.
API-571 Exam Question 192
Temperature, ________ and stress are critical factors of stress rupture. This is usually found in furnaces with coking tendencies and fired heater tubes.
API-571 Exam Question 193
Sulfidation is primarily caused by:
API-571 Exam Question 194
Thermal fatigue cracks usually propagate _______ to the stress and they are usually dagger-shaped.
API-571 Exam Question 195
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 _________.
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