API-571 Exam Dumps | Increasing chromium content in the alloy improves resistance to sulfidation. However, there is little

<< Prev Question Next Question >>

Question 106/190

Increasing chromium content in the alloy improves resistance to sulfidation. However, there is little improvement with increasing chromium content until about ________ Cr.

A. 5-7

B. 3-5

C. 9-12

D. 7-9

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 106/190

LEAVE A REPLY

Download PDF File