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Carbonate SCC can occur at relatively low levels of ________ but usually occurs at welds that have not been stressed relieved.
Carbonate SCC can occur at relatively low levels of ________ but usually occurs at welds that have not been stressed relieved.A . Residual stressB . Applied stressC . Acid concentrationD . None of the aboveView AnswerAnswer: A
With short term overheating, time to failure will ___________ as internal pressures or loading decrease.
With short term overheating, time to failure will ___________ as internal pressures or loading decrease.A . IncreaseB . DecreaseC . Remain the sameD . None of the aboveView AnswerAnswer: A
Carbonate SCC may easily be mistaken for SSC or SOHIC; however, the carbonate cracks are usually ________ the toe of the weld and have multiple parallel cracks.
Carbonate SCC may easily be mistaken for SSC or SOHIC; however, the carbonate cracks are usually ________ the toe of the weld and have multiple parallel cracks.A . Further fromB . Closer toC . Diagonal toD . Perpendicular toView AnswerAnswer: A
The regenerator reboiler and the regenerator are areas where the temperature and __________ of the amine stream are the highest and can cause significant corrosion problems.
The regenerator reboiler and the regenerator are areas where the temperature and __________ of the amine stream are the highest and can cause significant corrosion problems.A . PressureB . StressC . TurbulenceD . ConcentrationView AnswerAnswer: C
Sulfidation of iron-based alloys usually begins at metal temperatures above _____.
Sulfidation of iron-based alloys usually begins at metal temperatures above _____.A . 500º FB . 600º FC . 800º FD . 1000º FView AnswerAnswer: A
All piping and equipment exposed to HF acid at any concentration with hardness levels above the recommended limit (237 BHN) are subject to _________.
All piping and equipment exposed to HF acid at any concentration with hardness levels above the recommended limit (237 BHN) are subject to _________.A . Hydrogen stress crackingB . Sulfide stress crackingC . Chloride stress crackingD . None of the aboveView AnswerAnswer: A
With sulfuric acid corrosion, carbon steel corrosion rates increases significantly if the flow velocity exceeds about ________m fps or at acid concentrations below _________.
With sulfuric acid corrosion, carbon steel corrosion rates increases significantly if the flow velocity exceeds about ________m fps or at acid concentrations below _________.A . 6-9, 80%B . 5-7, 75%C . 2-3, 65%D . 4-6, 85%View AnswerAnswer: C
Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called ______. It is most often found in heavy wall sections.
Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called ______. It is most often found in heavy wall sections.A . Thermal crackingB . Reheat crackingC . Step-like crackingD . None of the aboveView AnswerAnswer: B
What type of damage mechanism would cause the cracks to form?
A vacuum tower operating at 740º F is being entered to inspect. Several sets of Type 410 SS trays are bent at various angles. The trays are removed in order to straighten them. When an attempt is made to straighten them cracks form at the bends. What type of damage...
What standard refers to Risk-Based-Inspection?
What standard refers to Risk-Based-Inspection?A . RP 581B . RP 579C . RP 588D . RP 568View AnswerAnswer: A
