API 510 Questions

S.E.M INSPECTION SDN. BHD. COMPANY NO.: 372496-D

API 510 QUESTIONS

1. a. b. c. d.

The application of API 510 is restricted to organization that: Fabricate or build pressure vessels according to ASME B & PV Code. Employ or have access to an authorized inspection agency. Manufacture or inspect pressure vessels according to NBIC. Hire or have access to an unsanctioned unsanctioned inspection agency.

2. API 510 Inspection Code is only applicable to pressure vessels used by the petroleum and chemical process industries that: a. are being fabricated for the petroleum/chemical industries. b. can be fabricated to ASME B&PV Code and inspected by NBIC inspectors. c. will be place in service after fabrication to the ASME B&PV Code. d. have been placed in service; inspected and/or repaired by an authorized agency. 3. The following is an example of a pressure vessel not excluded from coverage by API 510. (All of the vessels are in-service) a. Pressure vessel on an ocean-going ship, operates at 100 psig & 100 F. b. Pressure vessel vessel in a oil refinery, operates at 5 psig and 70 F. c. Pressure vessel vessel in a oil refinery, operates at 100 psig and 200 F. d. Pressure vessel vessel in a oil refinery, vol. of 4 cu ft & operates at 70 psig and 70 F. 4. a. b. c. d.

The term “minimum allowable shell thickness” is the thickness: essential for the shell and heads of a vessel. required for each element of a vessel. necessary for the shell of a vessel. including the corrosion allowance for the shell of a vessel.

5. _____________ _____________ may occur if equipment is subjected to temperatures above those for which it is designed. a. Creep b. Brittle fracture c. Stress Corrosion d. Erosion 6. The period between internal or on-stream inspections shall not exceed one-half the estimated remaining life of the vessel based on corrosion rate or ___________ years whichever is less. a. 10 b. 15 c. 5 d. 12

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API 510 QUESTIONS

7. A pressure vessel has been in service for 12 years and has shown a history of corrosion over its service life. The original thickness was 1.9375” thick and the present thickness is 1.405”. What is the corrosion rate for this vessel? a. 0.266250 inches/year b. 0.532500 inches/year c. 0.088750 inches/year d. 0.044375 inches/year 8. a. b. c. d.

What is the maximum inspection interval of pressure-relieving devices? 15 years 12 years 10 years 20 years

9. a. b. c. d.

The following is not normally found in pressure vessel records. Manufacturers data reports Vessel identification numbers Piping past the first vessel flange Relief valve information

10. What type of repairs can an authorized inspector give prior general authorization for ? a. major repairs that require pressure tests. b. alterations that require pressure tests. c. major alterations that require pressure tests. d. limited or routine repairs that will not require pressure tests. 11. The repair organization shall maintain records of its qualified welding procedures and its welding performance qualifications. These records shall be available to the _________ prior to the start of welding. a. operator b. Owner-user c. welder d. inspector 12. For alterations or repairs of vessel initially post weld heat treated as a code requirement and constructed of P-1 and P-3 steels listed in the ASME Code, preheating to not less than _______ degree F may be considered as an alternative to PWHT. a. 200 b. 300 c. 400 d. 500 13. A pressure test is normally required after: a. an alteration b. a repair c. a lightning strike d. a unit upset

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API 510 QUESTIONS

14. The minimum number of TML’s on any given vessel is : a. determine by the API 510 Inspector b. determined by the owner/user c. at least one d. at least 4 on each shell and head 15. If a short-term corrosion rate reflects a 0.001” per year corrosive environment currently exists and the long-term corrosion rate is 0.009” per year, the corrosion rate used in calculating the inspection interval should be: a. the long term b. the short term c. both terms d. as defined by the Inspector for the process 16. Risk Based Inspection may be conducted to evaluate: a. consequence of a failure b. likelihood of a failure c. possibility of a failure d. a & b above 17. A pressure vessel has an established corrosion rate of 0.012” per year. The vessel was last inspected in 2001 and had a measured wall thickness of 0.375 “ per year. The minimum required thickness for this vessel based on calculation performed in accordance with the original construction code is 0.265” per year. Utilizing this information, what is the remaining life of this pressure vessel? a. 9 years b. 5 years c. 15 years d. 7 years 18. A pressure vessel was placed into service in 1989 and was constructed with a design thickness of 0.750”. In 2001 the wall thickness was measured at 0.630”. Based on this information and a minimum thickness of 0.550”, when is the next internal inspection due to this pressure vessel? a. 4 years b. 2 years c. 8 years d. 10 years. 19. The most common material used to construct pressure vessel is: a. titanium b. austenitic stainless steel c. monel d. carbon steel

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API 510 QUESTIONS

20. Which of the following may cause the improper performance of a pressure-relieving device? a. Damaged seating surfaces b. Failed springs c. Rough handling d. All of the above 21. Which of the following pressure-relieving devices would be used to protect the upstream side of pressure relief valve against corrosion? a. Safety Valve b. Relief Valve c. Rupture Disk d. Conventional Safety Relief Valve 22. An inspection or testing of a pressure relieving device is required by API 510 at least every ________ years maximum a. 7 b. 10 c. 15 d. 20 23. When a pressure relief valve is first received in the shop, what should be done prior to dismantling? a. dismantle and clean the valve b. check the valve spring for corrosion c. dip the valve in a cleaning solution d. test pop the valve to determine the “as received” relieving pressure 24. Which of the following should be on a pressure relieving device’s identification tag? a. Test dates b. Unit designation c. Set pressure d. All of the above 25. Which of the following pressure relieving devices would be used to protect the upstream side of a pressure relief valve against corrosion? a. Safety valve b. Relief valve c. Rupture Disk d. Conventional Safety Relief Valve 26. What normally causes the failure of pressure relief valve springs? a. Over tightening of the set screw b. Improper assembly c. Lack of maintenance d. Corrosion

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API 510 QUESTIONS

27. Which of the following types of heads will normally require the greatest wall thickness? a. 2:1 elliptical head b. Dished torispherical c. Hemispherical head d. Flat head 28. The symbol “HT” on a pressure vessel nameplate indicates: a. Vessel was hammer tested b. Whole vessel was Post Weld Heat Treated c. Vessel is good for high temperature d. Vessel was hydrotested 29. A welded carbon steel joint has an MDMT that is colder than 120 F, at what governing thickness must impact materials always be used? a. > 4 in b. < 2 in c. 6 in d. 3 in 30. Which of the following are classified as service restrictions under Section VIII, Div. 1? a. Lethal b. Vessel operating below certain temperatures c. Unfired steam boilers exceeding 50 PSI d. All of the above. 31. Longitudinal welded joint within the main shell or nozzles are Category ________ a. C b. D c. A d. B 32. When performing thickness calculations for shells and tubes under of a under external what value must first be determined? a. L/Do ratio b. D/D ratio c. Do/t ratio d. t/Do ratio 33. A pressure vessel is to be hydrostatically tested in accordance with the ASME code. The MAWP is 654 PSI. Sd = 8600 PSI and St = 17500 PS I. What is the minimum required test pressure? a. 981 b. 818 c. 1730 d. 1308

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API 510 QUESTIONS

34. A torispherical head is connected to a seamless vessel with a single welded butt joint with backing. The seam has been welded by single welder, and i s spot radiographed per UW 11 (a) (5) (b). What is the type of joint, joint category and joint efficiency factor? a. Type 1, Cat. D, E=0.85 b. Type 2, Cat. B, E=1.0 c. Type 2, Cat. A, E=1.0 d. Type 2, Cat. B, E=0.85 35. A vessel’s cylindrical shell has corroded down to 0.25” in thickness. The cylinder is 40” OD with an unsupported length of 10’. Design te mperature is 300 F, and the material yield strength is 30,000 psi. What is the allowable external pressure allowed on this vessel? a. 38 psi (approximately) b. 45 psi (approximately) c. 12 psi (approximately) d. 23 psi (approximately) 36. A vertical pressure vessel in water service with Type 1 Category “A” long seam welds is 10’ seam/seam, is made from ½” thick SA 516 Gr . 70 material (S=17,500), is stamped for an MAWP of 100 psig @ 650 F, and is also stamped as RT-3 (satisfies spot RT rules) with an ID of 60”. What is the actual minimum thickness of this vessel, including hydrostatic head. a. 0.211” b. 0.250” c. 0.350” d. 0.360” 37. What is the required thickness of a seamless flat, unstayed circular head with a diameter (or short span) of 24”, an internal design pressure of 250 psig @ 650 F, with material of SA 105 (S=17,500) ? Attachment is as shown in Fig. UG-34 (A), and the inside corner radius is not less than three times the required head thickness. a. 1.1” b. 1.9” c. 2.1” d. 1.66” 38. A pressure vessel head is thinned at the knuckle radius to 0.250 thick. The head is attached to the vessel with a type 1 joint that is fully RT and operated at 600 F. The head is a 2:1 elliptical head with an ID of 45” and is made from SA 285 Gr. C (S=13,800) material. What MAWP can be operated on this head, with no static head consideration? a. 175 psi b. 153 psi c. 190 psi d. 142 psi

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API 510 QUESTIONS

39. What is the minimum thickness required for a pressure vessel that is stamped with a 600 psig @ 500F MAWP, is 70” OD, complies with the rules for spot RT, has Type 2 joint, is made from SA 516 Gr. 60 (S=15,000) material and is 25’ high in water service? a. 1.950” b. 1.074” c. 1.560” d. 1.746” 40. An 80” ID vessel is Full RT, is 1” thick and is made from SA 516 Gr. 70 (S=17,500) material with Type #1 joints with an MAWP of 150 psig @ 600 F. If this vessel corrodes at an even rate of 1/ 8” per year, how many years may the vessel operate within the principals of the ASME Code? a. 5.24 years b. 2.62 years c. 10.48 years d. 3.15 years 41. A pressure vessel is currently 0.370” thickness 10 years from now the vessel i s scheduled to be inspected again. The stress is 17,100 psi and the vessel is stamped RT-2 with Type 2 longitudinal weld seams. The last thickness measurements (5 years ago) reflected that the vessel was 0.407” thick. If the vessel is 72” ID and the corrosion rate is expected to continue, what MAWP should be allowed on the vessel per API 510 Para 6.4? a. 98 psi b. 150 psi c. 180 psi d. 200 psi 42. A pressure vessel has been inspected and found to be thinned over a 20” long area, parallel with the long seam. Thickness readings in this area are 0.275”, 0.279”, 0.280”, 0.290” and 0.295”. Original thickness is 0.375”. The vessel is now 11 years old. MAWP is 80 psig @ 100 F, 24” ID and material stress is 16,800. Joint efficiency is 0.85. 1. What is the minimum shell thickness? 2. What is the longest dimension that can be corrosion averaged per API 510? 3. What is the internal or on stream inspection interval for the vessel based on the above?

a. b. c. d.

1. 0.067” , 2. 12” , 3. 10 years 1. 0.100” , 2. 6” , 3. 10 years 1. 0.500” , 2. 2.44” , 3. 10 years 1. 0.050” , 2. 2.14” , 3. 10 years

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API 510 QUESTIONS

43. A vessel is ultrasonically checked on the shell in 1990 and is 0.637” thick. This same spot is checked again in 1996 and is 0.607” thick. It is on-stream inspected again in 1999 and is 0.509” thick. What is the remaining life of this vessel if the maximum thickness is 0.411” thick? a. 1.5 years b. 2.7 years c. 3.2 years d. 6.4 years 44. A 30” ID vessel is fully RT, has type 1 joints, is 0.500” thick and is stamped for an MAWP of 100 psig @ 300 deg. F with a co rrosion allowance of 1/16” and minimum temperature of -40 deg F. If the material is SA 516 Gr. 70 (not normalized), does this vessel require impact testing? (A reduction stress ratio of 1.0 will be used, per UCS 66.1) a. yes, requires impact testing b. no, does not require impact testing c. exempted from impact per UG-20 (f) d. not enough information provided 45. A stationary vessel is made from SA 516 Gr. 70 plate that has been normalized. The MDMT is 30 deg F @ 470 psig. The actual material thickness is 3.0” thick, and the vessel ID is 48” and the joint efficiency is 1.0. Does this material require impact testing? a. yes b. no c. not enough information d. none of the above

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API 510 Questions

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