API 653 Mar2016

API 653 notes 2016
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     API-653 Exam (March 2016) 1.   A party other than the owner/operator is assigned certain tasks, such as relocating and reconstructing a tank, the limits of responsibility for each party shall be defined by the owner/operator prior to commencing work. 2.   The owner/operator as Authorized inspection agency, inspection program shall  provide the controls necessary for use by authorized inspectors contracted to inspect aboveground storage tanks.   3.   Which of the following is considered to be an alteration  installation of shell penetration of NPS 14 in   4.   Jacking a tank shell is considered to be major repair 5.   When a frangible roof-to-shell joint is required, evaluate for items impacting compliance with requirements under API 650 includes tank bottom-to-shell joint corrosion   6.   Areas in the roof that are pitted shall be evaluated to determine the likelihood of through-pitting occurring prior to the next scheduled internal inspection 7.   When service of a tank is changed from heavy stored naphta to diesel service Vents shall be inspected  for proper operation 8.    L is t he maximum length, in inches, over which hoop stresses are assumed to “average out” around local discontinuities, this length shall be  chosen to be in a vertical plan 9.    L shall not exceed 40'' 10.   Widely scattered pits may be ignored provided that: no pit depth results in the remaining shell thickness being less than one-half the minimum acceptable tank shell thickness exclusive of the corrosion allowance 11.   Problem for the previous criteria 12.   Problem for determine H for local thin area 13.   Problem for T min . For the entire shell course 14.   Problem for determine S t  for A516  –   70 15.   Closed Problem for determine E for a Tank built for API-12C 14 th  Edition. 0.85 16.   Which of the following not considered Distortion of the tank shell ?tank shell out of plan tilt    17.   Which of the following change in service conditions will tend to reduce the capacity of the tank  ?  a) Change the operating temp from 200 F to 300 F (to reduce the vapor volume of the tank resulted from the partial pressure) b) Change the product from G=0.9 to a lighter one with G=0.8c) Reduce of the design metal temp.  18.   Min. bottom plate thickness for Tank bottom/foundation design with no means for detection and containment of a bottom leak is 0.1''    19.   For given D, t , H what is minimum thickness of the annular plate 20.   During external visual inspection, Concrete pads cracks showing evidence of spalling, but the re-bar is not exposed your action is  foundation    shall be repaired. (i.e. without entire removal of the foundation and make a new one) 21.   Which of the following has the least   effect on the probability of storage tank brittle fracture corrosion rate of the shell    22.   When change concerning the external pressure, the roof-to-shell junction shall be evaluated for the effects of a design partial vacuum according to The criteria outlined in API 650   23.   For brittle fracture assessment, which of the following shall consider the demonstration of hydrostatic test? 24.   Which of the following inspections can be performed with unauthorized inspector? routine inspection   25.   Routine inspection interval shall not exceed one month 26.   U.T measurement interval of unknown corrosion rate 5 years  27. RCA definition 28. Corrosion rate problem 29. RCA problem 30. Ground connection can be checked during the required external visual inspection    API-653 (not operation inspection) 31. A tank was built and enters the service in  Jan. 2005 ; initial internal inspection shall be made before date  Jan.2015  32. The external visual inspection shall be every five years, when this inspection can be made before this  period, if the   interval is calculated to be less than the one- fourth corrosion rate life. 33. Personnel performing C.P surveys shall be in according to the   API-651 34. The best method in determining the bottom thickness  Digital UT measurements.  35. UT measurements can be performed from external inspection and during internal inspection  36. Prior to conducting internal or external inspection, the inspector should thoroughly review any available inspection records   to become familiar with previous problems and recommendations noted. 37. Reports shall include recommendations for repairs and the reasons for the repairs 38. All new materials used for repair, alterations, or reconstruction shall conform to the current applicable  standard 39. The maximum liquid level for hydrostatic test shall be determined by calculate the allowable stress value as the lesser of 3/4 yield strength or 3/7 tensile strength shall be used    40. If a corrosion allowance is required for the reconstructed tank, the required corrosion allowance shall be deducted from the actual thickness before calculating the maximum liquid level   41. The thickness of the replacement shell plate shall not be less than the greatest nominal thickness of any  plate in the same course adjoining the replacement plate except where the adjoining plate is a thickened insert     plate  42. The repair plate may cross any butt-welded vertical or horizontal shell seams that have been ground flush, but must overlap a minimum of 6 in. beyond the shell seam  43. Determine A in Fig 9.7 t=5/16  A=3/8 44. A new bottom may be installed through an existing tombstone reinforcing plate by remove only that  portion of the existing reinforcing plate necessary to weld and test the new bottom-to-shell weld. 44. During in service inspection the measured thickness for the shell observed to be less than 50% of min. required thickness, in your opinion, for continued operation what is the action to be taken?  Reduce the liquid height  . 45. Welded-on patch plates are not permitted in the critical zone for    a   carbon steel tank bottom with an operating temperature exceeding 200 0  F 46. Arc strikes discovered in or adjacent to welded joints shall be repaired by grinding and/or welding  . 47. The use of welded-on patch plates that do not meet the requirements is permitted if the repair method has  been reviewed and approved by an engineer experienced in storage tank design in accordance with API 650  48. All arc-gouged areas of the tank shell-to-bottom weld  shall be magnetic particle examined, and defective areas repaired and re-examined. 49. Hot taps are not permitted on the roof of a tank or within the gas/vapor space of the tank  . 50. Completed welds of stress-relieved assemblies shall be examined by the magnetic particle or liquid  penetrant methods after stress relief, but before hydrostatic testing 51. New welding on the shell-to-bottom joint shall be examined for its entire length by using a right-angle vacuum box and a solution film, or by applying light diesel oil 52. The minimum diagnostic length of each radiograph  shall be 6 in. 53. Radiographs and radiograph records of all repaired welds shall be marked with the letter “R.”   54. Personnel performing PT, MT, and RT shall be qualified as well as  personnel performing VB.  55.   Hydrostatic Testing Exemptions if the tank    owner/operator has authorized the exemption in writing  . 56. Calculate the min thickness of the shell plate used for hot tapping a NPS 18'' nozzle. 57. FFS shall be performed by an engineer experienced in storage tank design and the evaluation methodologies used. 58. For Tank Diameter 65 feet, min. number of the settlement points is  8 59. If maximum height of bulge or depth of local depression exceeds the limits shown per API 653,  Repairs or a rigorous assessment should be conducted    60.During internal inspection two flat spots have been observed with 2 in depth and 5 ft height, these spots does not contain any weld seam, what is the action is to be taken no required repair as these spots are in the limits  61. Settlement measured is done by an engineer experienced in settlement measurement   62.   In riveted Shell Inspection, what is the best method to locate leaks?  By sketch or photo 63. NDE performers should be qualified and certified according to  ASNT-SNT-TC-1A  64.   MFL operators shall receive training of 40 hours . 65. The sample tank bottom should be a minimum of   70 ft  2   66. When qualifying either a procedure or a scanning operator, for remaining bottom thickness less than .05 the operator must be able to detect the following Flaws 90% to 100 %  67. For similar service assessment, Heavy sticky oil is as class   H. 68. If the criteria for the control tank and candidate tank do not match, the difference in corrosion allowance  should be accounted for in the remaining life and inspection interval calculations to consider both tanks in  similar service. 69. Unsupervised RT examiner shall qualified to  ASNT-SNT-TC-1A level 1 70. At each roof column, a wear plate with a nominal thickness of not less than 6 mm (1/4 in.) shall be welded to the tank Bottom with a 6 mm (1/4 in.) minimum fillet weld. 80. If a drip ring is specified by the tank owner, it shall have an extension beyond bottom plate by min. 3'' 81. Hardness test is important after PWHT for weld and heat affected zone to obtain acceptable softening of the welds  82. B back scatter letter image is rejected when it is white 83. What is the designation IQI hole type if (t=0.5 and IQI will be @ source side)? 84. Densitometers shall be calibrated by  step wedge calibration film . 85. Concerning MT by using prod Tech., during calibration the unit meter, the readings shall not deviate by more than ±10% of full scale  86. How many RT films shall be taken for completed joints of a replaced rectangular portion of the tank shell ?   6 films 87. During performing vacuum box test according to API-650, Partial vacuum pressure to be registered shall have a minimum pressure of 3 PSI  . 88. When it is impractical to stress relieve at a minimum temperature of 600 °C (1100 °F), it is permissible to carry out the stress-relieving operation at 1000 F for 4 hours table 89. During internal inspection which of the following methods are not reliable to obtain the bottom plate thickness?  Taking sample coupon  
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