API-571 Exam Dumps | __________ is a form of stress corrosion cracking normally occurring during shutdowns, startups or during

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Question 95/190

__________ is a form of stress corrosion cracking normally occurring during shutdowns, startups or during operation when air and moisture are present. Cracking is due to sulfur acids forming from sulfide scale, air and moisture acting on sensitized stainless steel.

A. Caustic SCC

B. Chloride SCC

C. None of the above

D. Polythionic acid SCC

Question List (190q): Question 1: Susceptibility to hydrogen stress cracking __________ with _...; Question 2: _________ is accelerated high temperature wastage of materia...; Question 3: Blistering, HIC and SOHIC have been found to occur between a...; Question 4: What standard refers to Fitness-For-Service evaluations?...; Question 5: Sulfidation is also known as ____________....; Question 6: Thermal fatigue cracks usually:...; Question 7: Most brittle failures occur:; Question 8: Hydriding of titanium is a metallurgical phenomenon in which...; Question 9: At high temperatures, metal components can slowly and contin...; Question 10: Since all fuels contain some amount of sulfur, sulfuric and ...; Question 11: Carbonate stress corrosion cracking is the term applied to s...; Question 12: Preventative measures to minimize the potential for brittle ...; Question 13: Dissimilar metal welds with a 300 Series stainless steel wel...; Question 14: SCC usually occurs at pH values above two (2). SCC tendency ...; Question 15: A form of mechanical fatigue in which cracks are produced as...; Question 16: If weld repairs are required, the effects of temper embrittl...; Question 17: With cooling water corrosion, _________ oxygen content tends...; Question 18: The "L" grade of stainless steels will sensitize if exposed ...; Question 19: ________ and _______ damage develop without applied or resid...; Question 20: Units where graphitization may be suspected are the FCCU and...; Question 21: In most cases, brittle fracture occurs only at temperatures ...; Question 22: Carburization can be confirmed by a substantial increase in ...; Question 23: Heat treatment can have a significant effect on the toughnes...; Question 24: With high temperature hydrogen attack, ________ using a comb...; Question 25: With very few exceptions, cooling water should always be on ...; Question 26: Which of the following metals is the most anodic?...; Question 27: Steam blanketing is when the heat flow balance is disturbed;...; Question 28: The effects of hydrogen embrittlement ___________ with _____...; Question 29: ___________ cooling water outlet temperatures and/or process...; Question 30: Cracking of dissimilar weld metals occurs in the __________ ...; Question 31: _________ significantly increases the probability and severi...; Question 32: Thermal fatigue cracks usually initiate on the _________ of ...; Question 33: A vacuum tower operating at 740º F is being entered to inspe...; Question 34: With high temperature sulfide corrosion (Sulfidization), not...; Question 35: With chloride stress corrosion cracking, __________ temperat...; Question 36: A fatigue fracture is brittle and the cracks are most often ...; Question 37: With sour water corrosion, streams with a pH below ________ ...; Question 38: Which of the methods are effective for finding thermal fatig...; Question 39: The loss in strength from spheroidization (Softening) is usu...; Question 40: ______ is most likely found in hard welds and heat affected ...; Question 41: The creep threshold temperature for carbon steel is ________...; Question 42: Which of the following is not a primary factor contributing ...; Question 43: _________ is the result of cyclic stress caused by variation...; Question 44: Cracks connecting hydrogen blisters are referred to as _____...; Question 45: Caustic embrittlement is a form of stress corrosion cracking...; Question 46: Vibration-induced fatigue can be eliminated or reduced throu...; Question 47: _________ is surface initiated cracks caused by environmenta...; Question 48: Changing to a more corrosion resistant and/or higher hardnes...; Question 49: A prime location for erosion is:...; Question 50: Creep and stress rupture is more likely in a _________ grain...; Question 51: What structure is 304 stainless steel?...; Question 52: Corrosion of carbon steel and other alloys from their reacti...; Question 53: Short term overheating is a permanent deformation occurring ...; Question 54: 300 Series SS is susceptible to LME when it comes in contact...; Question 55: With hydrofluoric acid corrosion, corrosion rates increase w...; Question 56: ________ injection downstream of the desalter is another com...; Question 57: Cavitation is a form of erosion caused by the formation and ...; Question 58: For 5Cr-0.5Mo, what is the threshold temperature for creep?...; Question 59: ________ greatly increases the probability and severity of b...; Question 60: Blistering, HIC, SOHIC and SSC damage can occur wherever the...; Question 61: Which of the following is not a method used to prevent britt...; Question 62: The primary factors affecting high temperature oxidation are...; Question 63: Type 304L SS is satisfactory for phosphoric acid concentrati...; Question 64: What is the chemical symbol for ethane or ethylene?...; Question 65: Oxygen and iron in the wash water injected into reactor effl...; Question 66: The amplitude and frequency of vibration as well as the ____...; Question 67: With sulfidation, the presence of oxygen ________ corrosion...; Question 68: Cadmium and lead will cause LME on _____________....; Question 69: A carbon steel bundle from the overhead condenser in the cru...; Question 70: Nitriding begins above ________ and becomes severe above ___...; Question 71: Caustic stress corrosion cracking typically propagates _____...; Question 72: Stresses acting on the weldments are significantly ________ ...; Question 73: Cracking susceptibility increases with __________ pH and car...; Question 74: Stainless steels with sigma can normally withstand normal op...; Question 75: Stainless steel cyclones, piping ductwork and valves in high...; Question 76: 300 Series SS, 5Cr, 9Cr and 12Cr alloys are not susceptible ...; Question 77: Welds joining dissimilar materials (ferritic and austenetic)...; Question 78: Which of the following is not a critical factor that contrib...; Question 79: Corrosion rates of the anode will be less affected if there ...; Question 80: ______ is similar to HIC but is a potentially more damaging ...; Question 81: Ammonium chloride corrosion is the general or localized corr...; Question 82: Oxidation of carbon steel begins to become significant above...; Question 83: When caustic stress corrosion cracking is a concern, steam o...; Question 84: With creep, increased stress due to loss in thickness from c...; Question 85: For pressure vessels, inspection should focus on welds of __...; Question 86: The most important factors affecting graphitization are the ...; Question 87: A loss in ductility of high strength steels due to the penet...; Question 88: SSC generally occurs below about ________....; Question 89: With CO² corrosion, increasing temperatures _________ corros...; Question 90: It is generally accepted that stresses approaching _________...; Question 91: All piping and equipment exposed to HF acid at any concentra...; Question 92: In susceptible materials, the primary factor that affects si...; Question 93: Which of these materials are not susceptible to Spheroidizat...; Question 94: Sensitization occurs in the _____ to _______ range....; Question 95: __________ is a form of stress corrosion cracking normally o...; Question 96: Protection in a boiler from boiler feed water corrosion is a...; Question 97: MIC is often characterized by _______ within pits in carbon ...; Question 98: Which of the following materials are susceptible to nitridin...; Question 99: Mitigation of CUI is best achieved by _________....; Question 100: Contrary to a pure mechanical fatigue, there is no _________...; Question 101: Sulfidation is primarily caused by:...; Question 102: Damage due to __________ is not visible and can only be obse...; Question 103: When connected to a more anodic material, titanium may suffe...; Question 104: SOHIC is driven by localized stresses so that __________ is ...; Question 105: Proper application of ________ will control but not eliminat...; Question 106: Increasing chromium content in the alloy improves resistance...; Question 107: The most common method used for monitoring underground struc...; Question 108: ________ is a loss in toughness due to a metallurgical chang...; Question 109: ________ significantly increases the probability and severit...; Question 110: Thermal fatigue cracks propagate ________ to the stress and ...; Question 111: Low alloy steels contain a maximum of _______ chrome....; Question 112: With sulfuric acid corrosion, carbon steel corrosion rates i...; Question 113: __________ testing is the best method to determine the susce...; Question 114: _______ is the primary alloying agent that affects resistanc...; Question 115: Alloys with nickel content above _________ are highly resist...; Question 116: Amine stress corrosion cracking is a term applied to the cra...; Question 117: _________ material sections also have a ___________ resistan...; Question 118: The graphitization rate ____________ with increasing tempera...; Question 119: Higher __________ containing alloys are used for improved re...; Question 120: In most cases, brittle fracture occurs only at temperatures ...; Question 121: The regenerator reboiler and the regenerator are areas where...; Question 122: The best method to inspect for SCC is ____....; Question 123: Which of the following is not a major factor associated with...; Question 124: Cl SCC usually occurs at metal temperatures above ________....; Question 125: Stress ruptures are characterized by _________ failures and ...; Question 126: Hydrogen stress cracking is the same mechanism that is respo...; Question 127: Atmospheric corrosion is of greatest concern in:...; Question 128: At high temperatures, metal components can slowly and contin...; Question 129: If wet electrodes or high moisture content flux weld electro...; Question 130: Amine cracking is ________ likely to occur in lean MEA and D...; Question 131: For some materials such as titanium, carbon steel and low al...; Question 132: Start-up and shutdown of equipment increase the susceptibili...; Question 133: Soil to Air interface areas are usually more susceptible to ...; Question 134: Which material does not have an endurance limit?...; Question 135: With sulfuric acid corrosion, alloys such as Alloy 20 resist...; Question 136: Susceptibility to sulfidation is determined by the _________...; Question 137: Areas of vulnerability in sulfuric acid Alkylation units inc...; Question 138: _________ is a selective corrosion mechanism in which one or...; Question 139: In general, the resistance of iron and nickel based alloys t...; Question 140: Thermal fatigue becomes of concern if the temperature swings...; Question 141: Nitriding layers are magnetic. Therefore, _________ should b...; Question 142: Temperature, ________ and stress are critical factors of str...; Question 143: With short term overheating, time to failure will __________...; Question 144: Dissimilar weld metal cracking forms at the toe of the weld ...; Question 145: Titanium Hydriding damage occurs primarily in sour water str...; Question 146: Dissimilar weld metal cracking can be aggravated by _______....; Question 147: With decarburization, the decarburized layer will be free of...; Question 148: _________ is most likely found in hard weld and heat-affecte...; Question 149: Decarburization results in a __________, which can be confir...; Question 150: Erosion-corrosion is a description for the damage that occur...; Question 151: SSC is a form of hydrogen stress cracking resulting from the...; Question 152: _________ acid is most often used as a catalyst in polymeriz...; Question 153: To prevent hydrogen embrittlement, use lower strength steels...; Question 154: Cracking of a metal due to stress relaxation during PWHT or ...; Question 155: HCL acid corrosion is found in several units, especially ___...; Question 156: In HF service, carbon steel operating above ________ should ...; Question 157: A 6", A106 Gr B, flanged line carrying caustic wash water at...; Question 158: ____________ is a form of environmental cracking that can in...; Question 159: The major factors affecting high temperature sulfidation are...; Question 160: Wet H²S services or _________ acid services are process wher...; Question 161: Formation of a metallurgical phase known as sigma phase resu...; Question 162: Different organisms thrive on different nutrients including ...; Question 163: _________ of the amine system is the most effective way to p...; Question 164: Mechanical fatigue can cause cracks that initiate from the s...; Question 165: The best way to prevent 885º F embrittlement is to use low _...; Question 166: Caustic is sometimes added to process streams for ________ o...; Question 167: 300 Series SS can suffer pitting corrosion, crevice corrosio...; Question 168: Nitriding is usually confined to the surface of most compone...; Question 169: Surface initiated cracks caused by environmental cracking of...; Question 170: A quick test for embrittlement from _________ is a bend test...; Question 171: Mechanical fatigue is caused by:...; Question 172: With sulfuric acid corrosion, mix points with _______ cause ...; Question 173: High temperature hydrogen attack results from exposure to hy...; Question 174: For carbon steel, common velocity limits are generally limit...; Question 175: A form of fatigue cracking in which cracks develop under the...; Question 176: In order for PASCC to occur the material must be ______....; Question 177: The accepted way to test for temper embrittlement is _______...; Question 178: In pressure containing equipment, SOHIC and SCC damage is mo...; Question 179: SCC tendency ________ towards the alkaline pH region...; Question 180: What structure is 409 stainless steel?...; Question 181: Cooling water corrosion can result in many different forms o...; Question 182: A condition where steel loses strength due to the removal of...; Question 183: In fired heater tubes, dissimilar weld metal cracking forms ...; Question 184: Which of these materials are not susceptible to PASCC?...; Question 185: The removal of surface material by impacting materials is ca...; Question 186: Equipment that is temper embrittled may be susceptible to __...; Question 187: The dewpoint of hydrochloric acid depends on the concentrati...; Question 188: _________ is a mechanical form of degradation that occurs wh...; Question 189: Alloy 400 is susceptible to LME when it comes in contact wit...; Question 190: At elevated temperature, the carbide phases in certain carbo...

Question 95/190

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