1. Which of the following are excluded from the scope of application of API 510?
a. Pressure vessels on movable structures covered by other jurisdictional regulations
b. All classes of containers listed for exemption from construction in ASME Section VIII Div. 1
c. Pressure vessels which do not exceed volume of the five cubic feet and pressure of 250 psi
d. All of the above
2. During Hydrostatic testing, to avoid risk of brittle fracture, which of the following action may be taken?
a. Recalculate test pressure based on material stress at test temperature
e. Carry out test at temperature more 300F above MDMT f. The test area is cordoned off and out of bounds for
non-essential personnel g. None of the above
3. Which of the following are essential elements of a Quality control system of a repair organization?
a. Organisational authority and responsibility
b. Statements about Working (Inspection/repair)Procedures and their documentation
c. Statement of controls to ensure Quality conformance d. All of the above
4. According to API 510, authorized inspection agency is:
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a. Jurisdiction organization
b. Inspection organisation of Insurance company which under writes insurance of pressure vessels
c. Inspection organization of owner-user d. Any of above
5. Repair Organization: According to API 510 is:
a. Holder of ASME certificate & appropriate code symbol stamp.
b. Owner-user
c. Contractor under contract with owner-user d. Any of above
6. For all repairs and alterations under API 510, the ultimate responsibility rests with:
a. Owner user b. API Committee c. API-510 Inspector d. Jurisdiction authority
7. Identify incorrect statement from following:
a. A welder performing procedure test is also qualified in that position.
b. Supplementary essential variables become essential variables when impact test is specified.
c. For procedure qualification, the test can be performed in any position as the position is not essential variable for procedure qualification.
d. None of above.
8. Following two combinations of nozzle pipe dia and shell thickness are given of reinforcement. Case 1: vessel wall thk = ½ " and nozzle size NPS 3, Case 2 vessel wall thk = ¾ " Nozzle size NPS 2 ½ According to ASME Sec. VIII reinforcement requirement for which of above nozzles by should be verified by calculations?
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a. For both cases b. For none
c. Calculations required for 1 but not for 2 d. Calculations required for 2 and not for 1
9. Normally, minimum thickness evaluation may be conducted by?
a. Use of a external micrometer b. Ultrasonic testing
c. Vernier callipers d. None of above
10. Which of the following statements is true?
a. All defects are not discontinuities b. All discontinuities are defects
c. Discontinuities are rejectable defects d. Defects are rejectable discontinuities
11. A Pressure Vessel is being designed for 0.85 joint efficiency with full penetration welds. RT requirement for such vessel is
a. Nil
b. Spot
c. 100 %
d. Joints radiography
12. Post weld heat treatment is carried out a. To increase hardness
b. To increase tensile strength
c. To release locked-up stresses in the weld d. None of above.
13. If all other conditions remain same the design thickness of which dished end (torispherical, hemispherical, ellipsoidal) will be maximum?
a. Torispherical b. Hemispherical c. Ellipsoidal
d. All have same thickness
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14. In A 516 Gr 70 specification the letter A indicates:
a. That material is ASME material. (A for ASME) b. That material is Ferrous material
c. That material is Non-Ferrous material d. None of the above
15. Any thickness-offset within the allowable tolerance shall be provided a taper transition of:
a. 3 to 1 min.
b. 4 to 1 min.
c. 3 to 2 min.
d. All of the above
16. For calculating reinforcement pad requirements for given Design Pressure, which of the following statement is applicable:
a. Credit can be taken for extra metal in shell b. Credit can be taken for extra metal in nozzle c. a and b above are true
d. None of above
17. Choose correct Pneumatic test pressure from given options for a vessel with following data:
Design Pr = 160 psi Design temp= 675º F
M.O.C = SA 537 Cl. 1
Allow stress (Ambient) = 20000 psi Allow stress (675ºF) = 19200 psi
a. 176.0 psig b. 215.6 psig c. 183.3 psig d. none of above
18. You are planning for the Hydro-test of a complete vessel with Hydro test pressure 40Kg/cm2g. The calibrated test gauges
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available with you are 0-50 Kg/cm2g, 0-100 Kg/cm2g, 1-150 Kg/cm2g and 0-200 Kg/cm2g. Which two gauges are acceptable for this test? fabrication. What will be your action plan?
a. Correlate test certificate with applicable specification
b. Correlate heat marks and identification with the actual plate identification
c. Visual and dimensional inspection
d. All of the above are necessary action before accepting the plate.
20. Qualification of welding procedure as per Section IX is required:
a. For manual welding process b. For machine welding process
c. For semi automatic welding process d. For all of the above process
21. Erosion would normally be seen at:
a. Drain nozzles
b. Saddle wear plates c. Impingement plates d. a. and c.
22. Temper embrittlement is:
a. Brittleness due to low temperature operation
b. Brittleness due to Hydrogen Sulphide attack at high temperatures ( exceeding 700 deg. F)
c. Loss of ductility due to incorrect PWHT and High temperature service
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d. None of above.
23. Part MAWP for lower dished head in Vertical vessel will generally be:
a. Lower than top head b. Lower than shell
c. Higher than both shell and top head d. Same as both top head and shell
24. Choose correct statement — Allowable External pressure for a vessel:
a. Will depend on weld joint efficiency (E) b. Depends on Vessel temperature
c. Depends on Internal Corrosion allowance d. Both b and c
25. PWHT is required for vessels containing products, classified as “lethal” or a thickness exceeding:
a. 1.0 inch b. 0 .5 inch c. 0.0 inch d. 1.5 inch
SET-D
API 510 Preparatory Course
1. For safe entry in pressure vessels which of the following document is adopted in the API-510 body of knowledge?
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a. API – 2015 b. API – 576 c. IRE – Chap II d. ASME – Sec. V
2. A piping & valve system is described as follows: “closure of a line, duct, or pipe by closing and locking two in-line valves and by opening and locking a drain or vent valve in the line between the closed valves” This is designated in API documents as:
a. Double valve single drain “arrangement b. “On-off” arrangement
c. “Double block and bleed” arrangement d. “Double in single out” arrangement
3. An individual stationed outside one or more permit spaces who monitors the authorized entrants and orders the authorized entrants to evacuate the permit space under unsafe conditions.
This individual is referred as:
a. Supervisor
b. A qualified person c. An attendant d. None of above
4. HCl is more harmful in refining sour crudes because:
a. In presence of H2S, corrosion of iron by HCl becomes cyclic reaction regenerating HCl
b. HCL forms galvanic cell which causes corrosion cracking
c. HCl causes loss of ductility of steel.
d. None of the above
5. “In austenitic stainless steels, in presence of chlorides spontaneous failure may occur under combined action of corrosion and tensile stress” What type of phenomenon is described by this statement:
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a. Sensitization of stainless steel b. Stress corrosion cracking
c. Intergranular corrosion of stainless steels d. Chromium-decay of stainless steels.
6. Sour crude is more corrosive than sweet crude because a. Sour crude is heavier than is sweet crude
b. Sweet crude has more waxing tendency (compared to sour crude) which forms protective layer on metallic surfaces hence sweet crudes are less corrosive.
c. Sour crude contains high content H2S and sulpher compared to sweet crude which lead to several types of corrosion
d. None of the above.
7. The nondestructive examination method to be used for a particular inspection should be determined by the:
a. Availability of certified NDE examiners b. Length of time since the last inspection c. Age of the component to be inspected
d. Type, location, and orientation of the expected flaws 8. In planning for an internal inspection of a vessel that has acidic
corrodents, what type of corrosion would you expect to find on the vessel shell from inside,
a. Hydrogen blistering in the vapor space b. Uniform corrosion of vessel wall
c. Erosion of vessel walls.
d. None of above.
9. The principal reason for inspecting a pressure relief device is to determine:
a. Condition of pressure relief device and if it is functioning properly
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b. The remaining life of pressure relief device.
c. The spring coil diameter.
d. The body thickness.
10. Where (typically) are balanced safety relief valves used in refineries?
a. For pressure control and bypass
b. On steam boiler drums and super heaters
c. When the discharge from the valves must be piped to remote points
d. All of the above
11. Which of the following are possible reasons for improper performance of valves?
a. Corrosion
b. Damaged seating surfaces c. Failed springs
d. All of the above
12. Which of the following tests must be conducted on a valve as soon as it has been removed out of a system:
a. Visual Inspection
b. Hydrotesting of valve body c. Radiographic testing
d. Check set-pressure and leak tightness
13. Which of the following best describes a safety relief valve?
a. A spring – loaded pressure relieving device that is popped open by enough static pressure in the huddling chamber and kinetic energy of the gas or vapour to overcome the spring force on the disc as it is lifted to provide full opening and allow minimal overpressure
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b. A spring – loaded pressure relieving valve that acts as a safety valve when used in gas or vapour service and as a relief valve when used in liquid service.
c. A spring – loaded pressure relieving device for liquid service that begins to open when the inlet pressure reaches set pressure. Overcomes the spring force and begins to lift the disc off the seat and that continues to open as inlet pressure and the lift of the disc increase allowing the flow
of the liquid to increase d. All of the above
14. Which of the following are reasons for inspection of pressure relieving devices:
a. To protect personnel and equipment b. To determine the condition of a device c. To evaluate inspection frequency
d. All of the above
15. Which of the following could cause flutter/chatter in valves?
a. Improper material of construction b. Overpressure
c. Erosion
d. Large length piping to the valve inlet from the vessel 16. API 576 does not address:
a. Valve testing on test benches in shop b. Application of rupture discs
c. Training requirements for mechanics involved in inspection and repair of pressure relieving devices d. All of the above
17. If any settling is noticed on a vessel, which of the following should be done:
a. Conduct RT after 48 hours of observing the defective condition
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b. Nozzles and adjacent shell areas should be inspected for distortion and cracking
c. Use acoustic emission monitoring d. All of the above
18. Recommended resistance of electrical grounding connections is:
a. 5 ohms b. 50 ohms c. 100 ohms
d. none of the above
19. For vessels which are supported on concrete saddles and working in an area where the humidity is high which areas on them are typically susceptible to external corrosion?
a. At the anchor bolts in the foundation
b. At the Points of contact of the metal surface with the concrete
c. All of the above d. None of the above
20. H2S is in sour crude is more harmful in presence of:
a. Oxygen
b. Water (i.e. Wet H2S) c. Sulphur
d. ‘a’ and ‘c’ above
21. The leak tightness of the relief valves is tested on the test block at a pressure equal to:
a. Same as set pressure b. 90% of the set pressure c. Same as reseat pressure d. None of the above
22. During Hydrostatic testing, risk of brittle fracture, which of the following action may be taken
a. Replace Hydro testing by pneumatic testing
b. Recalculate test pressure based on material stress at MDMT
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c. Carry out test at temperature more 300F above MDMT
d. None of the above
23. Which of the following classifications of heat exchangers would have U-tubes incorporated into it?
a. AES type b. BEM type c. AEP type d. CFU type
24. If any setting is noticed on a vessel, which of the following should be done:
a. Conduct RT after 48 hours of observing the defective condition
b. Nozzles and adjacent shell areas should be inspected for distortion and cracking
c. Use acoustic emission monitoring d. All of the above
25. Which of the following are typical deterioration that can take place on the external surfaces of vessels?
a. CUI
b. Caustic embrittlement c. Erosion
d. All of the above
26. The external surfaces of vessels should be examined not only for corrosion but also for:
a. Leaks b. Cracks c. Buckles
d. All of the above
27. Which of the following are commonly used techniques of surface preparation for inspection:
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a. Wire brushing b. Sand – blasting
c. High pressure water blasting d. All of the above
28. According to API 510, authorized inspection agency is:
a. Jurisdiction organization
b. Insurance company which under writes insurance of pressure vessels
c. Inspection organization of owner-user d. Any of above
29. Repair Organization: According to API 510 is
a. Holder of ASME certificate & appropriate code symbol stamp
b. Owner-user
c. Contractor under contract with owner-user d. Any of above
30. For corrosion area of considerable size; thickness averaging along most critical element shall not exceed following length for 72” ID
31. According to API 510 for ellipsoidal head, crown portion thickness recalculation:
a. Crown can be taken as spherical portion of radius K1 x D b. K1 depends on D/2h ratio
c. Crown lies within concentric circle of 80% shell diameter d. All of above
32. For non-continuous corrosive service with remaining life 25 years, external inspection shall be performed after:
a. 10 years
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b. 12.5 years c. 5 years
d. None of above
33. Inspection records shall have following information a. Design & Construction records (permanent) b. Running inspection records
c. Repair and alteration records d. All of above
34. According to API-510, restoration by welding of parent metal loss may be made by using by electrodes having tensiles strength:
a. Same as parent material b. Higher than parent material c. Lower than parent material d. All of the above
35. For all repairs and alterations under API 510, the ultimate responsibility rests with
a. Owner user b. API Committee c. API-510 Inspector d. Jurisdiction authority
36. “Hot tapping” means
a. Light tapping of vessel by ball point hammer to find leakages when the vessel is operating at working temperature.
b. Cutting the threads in the help of tap and die when material hot so as to make the cutting of threads easier
c. Act of providing new tapping connection while the vessel is in operation
d. Tapping hot water samples from process plants for analysis purpose
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37. Which of the following is an advantage of magnetic particle testing over penetrant testing?
a. can detect surface discontinuities with foreign material imbedded in them
b. It is faster on individual parts
c. It can detect near-surface discontinuities d. All of the above
38. In an A-scan presentation, the amplitude of vertical indications on the screen represents the
a. Amount of ultrasonic sound energy returning to the search unit
b. Distance traveled by the search unit c. Thickness of material being tested
d. Elapsed time since the ultrasonic pulse was generated 39. The nondestructive examination method to be used for a
particular inspection should be determined by the:
a. availability of certified NDE examiners.
b. length of time since the last inspection.
c. age of the component to be inspected.
d. type, location, and orientation of the expected flaws.
40. Which of the following statements is true?
a. All defects are not discontinuities.
b. All discontinuities are defects.
c. Discontinuities are rejectable defects.
d. Defects are rejectable discontinuities.
41. Which of the following search unit would contain the thinnest quartz crystal?
a. A 1 megahertz search unit b. A 5 megahertz search unit c. A 15 megahertz search unit d. A 25 megahertz search unit
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42. Which of the following can be magnetized?
a. Iron b. Nickel c. Cobalt
d. All of the above
43. Why are magnetic particles available in different colors?
a. For color contrast with the part surface.
b. To enhance the detection of indications.
c. Both a and b.
d. Different colors are used with different magnetic flux values.
44. Visual testing is a
a. Nondestructive testing techniques applicable for surface and internal discontinuities
b. Nondestructive testing techniques applicable for surface discontinuities only.
c. Destructive testing techniques applicable for surface and internal discontinuities.
d. Destructive testing techniques applicable for internal discontinuities only.
45. Incase of horizontal insulated vessel most likely location of CUI will be:
a. Under belly areas
b. At the top in lengthwise area
c. In 3 O’clock and 9 o’clock position d. Uniformly all over
46. The rate of erosion varies as:
a. Square of fluid velocity b. Linearly with velocity c. Varies as cube of velocity
d. Varies as square root of velocity
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47. For testing relief valves for set pressure:
a. Only air shall be used b. Only water shall be used c. The combination may be used
d. Only nitrogen shall be used irrespective of service condition 48. Cracks and laminations look similar from surface however,
generally:
a. Cracks run normal to vessels surfaces b. Lamination runs slant or parallel to surface c. a and b above
d. None of above
49. Visual Testing can detect the following weld discontinuities.
a. Undercut b. Crater crack
c. Excessive reinforcement d. Allof the above
50. What probe would be chosen to detect the smallest defect if steel specimen with a velocity 6 x 106 mm/sec is to be inspected?
a. 2 MHz b. 10 MHz c. 5 MHz d. 6 MHz
51. Austenitic S.S. is considered as good Cryogenic material because:
a. Because of its good corrosion resistance b. Because of its good tensile Strength c. Because of its good yield Strength d. Because of its good impact Strength
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SET-E
API 510 Preparatory Course
1. For repairs on vessel walls, which have been subjected to PWHT as a code requirement and made of P1 or P3 Steels, (for which exemptions exist in ASME Sec. VIII Div 1 code,) which of the following options may be adopted?
a. Conduct RT after 48 hours of completion of all hot work b. Pre- heat to al least 3000F as an alternative to PWHT
after repair
c. Use acoustic emission monitoring d. Ultrasonic testing
2. HCl is more corrosive in refining sour crudes because:
a. In presence of H2S, corrosion of iron by Hcl becomes cyclic reaction regenerating Hcl.
b. Hcl liberates chlorine in presence of sulphur which causes stress corrosion cracking
c. Hcl liberates Hydrogen in presence of sulphur causing Hydrogen embrittlement.
d. None of the above
2. “In austenitic stainless steels, in presence of chlorides spontaneous failure may occur under combined action of corrosion and tensile stress” What type of phenomenon is described by this statement?
a. Sensitization of stainless steel?
b. Stress corrosion cracking
c. Intergranular corrosion of stainless steels d. Chromium-decay of stainless steels
4. Sour crude is more corrosive than sweet crude because a. Sour crude is heavier than sweet crude
b. Sweet crude has more waxing tendency (compared to sour crude) which forms protective layer on
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metallic surfaces hence sweet crudes are less corrosive.
c. Sour crude contains high content H2S and sulpher compared to sweet crude which lead to several types of corrosion
d. None of the above.
5. In planning for an internal inspection of a vessel that has acidic corrodents, what type and location of corrosion would you expect to find on the vessel shell, away from the welds?
a. Hydrogen induced cracking in the vapor space b. Hydrogen embrittlement in the vapor space c. Hydrogen blistering near the liquid level
d. Hydrogen embrittlement below the liquid level
6. What can be done to extend the life of a vessel with a corroded area in the shell plate 12 inches from the weld, a joint efficiency of less than 1, and a corrosion thickness currently near the minimum required thickness?
a. Recalculate t minimum for current operating conditions using E < 1.
b. Recalculate t minimum for current operating conditions using E = 1.
c. Recalculate t minimum for design conditions using E = 1.
d. Recalculate t minimum for design conditions using E < 1.
7. A pressure vessel constructed according to ASME Sec VIII Div 1 with shell thickness 7/8’’ (Material of Construction is classified as P no 4 Gr. 1), repaired by using insert plates.
7. A pressure vessel constructed according to ASME Sec VIII Div 1 with shell thickness 7/8’’ (Material of Construction is classified as P no 4 Gr. 1), repaired by using insert plates.