4 15 september 2008 API 510 PREPARATORY Mid-Session Exam (Closed Book) A vessel made with full penetration double welds shows name plate aooo 1g of ‘RT2’. The joint efficiency for this vessel will be: 0.85 0. None of these Which of the following are essential elements of a Quality control system of a repair organization? a b. c. a. Statement of authority and responsibility Welding procedures used for repair/alterations The Control of procedures and Qualifications of NDE isa Who is responsible for transferring the plate marking to the balance plate for a vessel repair work? ‘Authorized inspector who is overs the repair activities The piate marking and cutting persons involved in the repair process The pressure vessel Engineer who approved the repair work A repair work on a pressure vessel is to be carried ‘out. Who is responsible to have WPS/PQR made for the repair work? a. Owner user b. c. Authorized inspector d. Third party who does the inspection workBefore entering into a vessel for inspection the vessel shall be evaluated for safety in accordance to: a. OSHA b. API c. ASME/API d. ANST A pressure vessel fabricated in 1960 was in service. It has been decided to remove the top head and extend the height and replace the dish head with a new one. The proposal i: a. The proposal can be accepted for review by authorised Inspector b. No modification is allowed on this vessel c d. None of the above If vessel longitudinal and circumferential welds are type 1 and spot radiographed only, then stamping on name plate will be: a. RTL b. RT2 c qd. RT4 In the above question, if welds were fully radiographed for their entire length, the purpose is to conform to stamping to be put on name plate: a. RTL b. RT2 c RT3, a. RT4. A pressure vessel of 60” has three pits within a circle of 7” diameter. The nominal thickness of the shell is 0.75” and the CA is 0.125". The details and dimensions of the pits are listed below. Your assessment is: - 0.475" x 0.385” depth 0.21” - 1" diameter denth 0.35” - 0.375" x 0.385” depth 0.23” a. The pit area is more than the acceptable b. The pit length is more than the acceptable ©) The pit daptn is more tan the acceptable d. The pits are acceptable as they are meeting the requirement10. aL. 12. 13. 14. 15. Insulation inspection on a insulated vessel with no history of corrosion, may be done by: a. Removing at least 10% of insulation to check the condition b. Removing insulation on all suspected areas c. Removing the entire insulation a. Vessel MAWP of existing vessel will be affected: a. If higher corrosion allowance is provided from existing vessel b. If design pressure is reduced (other factors remaining same) o [paestgn bumparsture changed & faded The Code formula for a torispherical head thickness as per ASME Section VIII Div. 1 actually gives the thickness required: 2. At crown portion b. c. Mean of (a) and (b) d. Lower of (a) and (b) Original construction code of a pressure vessel Is ASME Sec. VIII, Div.1. The vessel has corrosion problems and is being evaluated according to ASME Sec. VIII Div. 2. Who should approve the evaluation based on Sec. VIII, Div. 2? a. Pressure vessel engineer/organization who is experienced in design b. An authorized inspector c A bresture aswel engineerorganzatlon who is experienced in d. Only the owner-user The factors of LOF and COF are considered for which methodological evaluation? a. FES b. RBI c. API 510 d. ASME Sec. VIII Div. 1 and API 510 The minimum hydro test temperature for in-service vessel of 2" thickness is: b. MDMT+30°F cc. MDMT+ 0°C d. | MDMT+ 0°C16. 17. 18. 19. 20. As per ASME Sec. VIII, Div. 1, in pressure testing, if stress ratio = 1, the test pressure as compared to design pressure shall be: a. 1.5 times for hydrotest b. 1.3 times for pneumatic test c. Same for both hydro and pneumatic @. None ofthe above As per ASME Sec. VIII, Div. 1, if permanent deformation is observed due to over pressure during hydrotesting: a. The inspector should ask for re-test using proper test pressure. b. Follow-up the hydro-testing by a pneumatic test at proper pressure, taking suitable precautions as given in code for Pneumatic test. The inspector may ask for providing additional stiffening rings around vessel and carry out re-hydro test at proper test pressure d. The inspector may reject the vessel. For a new vessel the corrosion rate will be established based on: a. Run the vessel for 6 weeks and establish the corrosion rate b. Run the vessel for 12 weeks and establish the corrosion rate c. Run the vessel for 18 weeks and establish the corrosion rate d. A corrosion engineer should be consulted for establishing corrosion rate A pressure vessel internal inspection frequency can be increased more than 10 years provided RBI evaluation is carried out. It should be approved by? a. Owner user/Jurisdiction b. Pressure vessel engineer c. Authorized inspector a. Identify incorrect statement. a. ASME Sec. VIII, Div. 1 may be adopted for unfired steam boilers b. ASME Sec. VIII, Div. 1 may be adopted for vessels containing lethal fluids c. ASME Sec. VIII, Div. 1 may be used for design of mobile vessel a.21. 22. 23. 24. 25. 26. Identify correct statements. The pressure vessel materials tend to be less brittle: a. As material thickness increases b. As service temperature increases above transi temperature c. aandb d. None of above is a correct statement. Typical mode of failure in ferrous metals at low temperatures i: a. Ductile failure b. Creep failure c. Fatigue failure da. Dritle failure Which of the following is typical phenomenon in low-alloy chromium steels? a. Creep failure b. ‘Tamper embrittlement c. Caustic embrittlement d. Stress corrosion cracking Which of the following is typical phenomenon in Silicon steels at elevated temperatures above 700°F? a. Graphitization b. Stress corrosion cracki c. Carbide formation and carbide cracking 4. Tamper embrittlement If the part to be PWHT’ed is longer than the furnace, multiple shot PWHT is proposed. What is the minimum over lap as per code to ensure proper PWHT? a 2 feet b. c. 2 meter a. 5 meter In PWHT of pressure vessels that are built in carbon and low- alloy steels: a. Minirnum PWHT temperature increases with increase of vessel thickness. b. | PWHT Soaking period increases with increasing vessel thicknes: c ee d. Only (b) and (c) above27. 28. 29. 30. 31. 32. ‘Scope of API 510 cavers: a. Nuclear vessels b. Vessels for human occupancy c. Power boilers d. If there is conflict between API 510 rules and prevailing isdictional requirement: a. API 510 shall prevail over jurisdiction requirements. b. Jurisdiction requirements will prevail over API 510 reantirements c. Depends on authorised inspector, which one to adopt d. Depends on owner / user, which one to adopt “On stream-inspection” means Inspection carried ou a. Only when a vessel is in operation b. Only when a vessel is not in operation c d. — *On-stream inspection” is same as “external inspection” As per API 510, all NDE results for in-service inspection shall be ‘evaluated and accepted by: a. NDE Level II or Level III person only, as he already possesses requisite knowledge and skill to evaluate and accept NDE results c. Since NDE is specialist job, authorised inspector need not be involved d. (a) and (c) As per API 510, responsibility to develop a Quality Assurance Inspection Manual shall rest with: b. Authorised inspection agency ©. Jurisdiction authority d. None of the above For recertification of API 510 authorised inspector, he shall be “Actively engaged” in inspection of pressure vessels during the most recent 3-year period. The term “actively engaged” means: a. Minimum of 25% of time shall be spent on inspection activities b. Minimum of 20% of time shall be spent on inspection adivities AND shall cover inspection on at least 75 ressure vessels d. Performance of inspection on 100 pressure vessels as33. 34. 35. 36. 37. 38) Prior to internal inspection, the vessel should be made ready as follows: a. — Drained, purged, gas tested, isolated b. Isolated, gas tested, drained, purged c. a. Gas tested, isolated, drained, Purged A vessel failure occurred due to repeated stress fluctuations. The failure is called: a. Brittle failure b. Creep failure ‘. Fatigue falure a. Stress corrosion cracking (SCC) ue failure of pressure vessels may be caused due to: a. Temperature changes b. Pressure changes ec Anyortaorte) d. None of (a) or (b) Likely areas where fatigue failure may be caused are: a. Areas of high secondary stresses (stress concentration) b. Areas of uniform stress ¢. Areas exposed to stagnant flows 4. Only (a) and (b) Which of the following are characteristics of “creep” in carbon steel: a. Creep is aggravated at lower temperature b. Creep is aggravated at elevated temperatures c. 4. creep iS agaravated at points of stress concentrations Choose the correct statement. a. Higher the material ductility, higher is possibility of brittle failure. b. Carbon and low alloy steels are susceptible to temper embrittlement if operated at sub-zero temperature: c. ccations were metals wth ciferent thermal coefcients d. None of the above is correct statement.39. 40. al. 42. 43. For MAWP calculations as per API 510, the thickness as determined by inspection shall be used in these calculations after: a. Deducting corrosion loss up to next inspection B. _Deducting twice the corrosion lose up to next inspection c. Use the thickness as i d. As regards thickness reduction due to corrosion, Code does not give specific guidelines. A vessel in service has different zones of corrosion. The next Inspection frequency will be decided by: a. Zone with highest rate of corrosion b. Zone with lowest remaining life ©. Average rate of corrosion shall be taken into consideration d. Average remaining life of the vessel shall be considered Three corrosion patches were seen on the shell for a tall vertical vessel to decide their effect on vessel MAWP: a. Work out pert MAWP at thinnest patch and that will represent vessel MAWP. b. Vessel MAWP does not get affected by thinning of the vessel c. Work out part MAWP for lowest head, and that will represent vessel MAWP When dial-type indicating and recording pressure gauges are used to monitor leak testing, the maximum gauge range shall not exceed which multiple of the expected test pressure? a. 1% times b. 2% times c d. A vessel is to be pneumatically pressure tested to 250 psi. This test pressure will be reached in how many stages of pressurization? a. Sstages b. 2 stages eG stages d. 7 stages45. 46. 47. 48. In above question what will be the incremental values of pressurization at first and second stage if pneumatic test Pressure is 250 psi? b. c. 100 psi, 50 psi d. None of above For a vessel which was in service, top dished head (2:1 Ellip.) was corroded severely was replaced by a properly designed Hemisph. The head Is designed as per the present design conditions of the vessel. This is: a. A repair b. An alteration c. New vessel MAWP will have to be worked out. da. Pneumatic test is proposed for a vessel instead of standard hydro test. Most probable reason for this could be: a. The vessel internal is lined with refractory b. No water is available c. The skirt of the vessel is too week to take care of the static water head and pressure. a. ‘Any one or both of a and ¢ above Crown portion for both Ellipsoidal and Torispherical heads may be considered to be the located entirely within a circle whose center coincides with the center of the head and diameter equal to 80% of vessel diameter, d. Knuckle portion In post weld heat treatment inspection what important things you will verify: a. Loading temperature and heating rate b. Holding temperature and holding time ©. Cooling rate and un-loading (from furnace) temperature a49. 50. As per API 510, the organization who carry out PSV repair, testing has to be: a. Neads to ne a qualified and certified company to perform all repair work in accordance to ASME and registered with stp erganeation b. Have documented quality control procedure c Needs to have qualified personnel to carry out the on within scope of repair ¢. Gnly band ¢ above API 510 can be applied to in-service pressure vessels built as per: a. ASME Section VIII b. Other international standard cc Non-standard vessel which may be in operation d. API. 510 PREPARATORY |-Session Exam ~ Closed Book Dap Tus —77 and apt 510.45 ANSWER KEY REFERENCE @ |_ANS. | REFERENCE UG = 116 ¢.2 and Table UW 13 | 26) Cc UCS 56, di, 5 ‘AST S10, 4.3 27D | APT 510, App. A a] 8) arrsi0, 4.5 297 caer sions 11 5A APIS10, 5.1 306 APTS10, 4.4 SC) AMS10, 7.1.0 SA) APTS10,4.3, 7 ¢[ASME Vil, UG = 116 32, CAPT S10, App. BZ 3A ASME VITT,_UG- 116. 33D APT 510.5. ‘oC [avr si0, 87, 63,2, 2 34 caer s10, 5.2 30D | API510/ §:5'8 Practical Experience | 35 | C | APLS10, 5.2 1D] APTS10, 5.4 36) A APTS10, 5.2 32) B | APTS10, 5.7€ 37D | ae si0, 5.2 13) cf aerst0. 5.70 3a) cf ap 510.52 14]_B | P1510, 6.2, 396 | API S10, 5.4 15) A) aPTsi0, 6.5 40.) BAP S10, 6.4 16|_D| UG - 99 and US 100 41D | ASME Vill, UG = 98 (a) 37D [us =99 (a) 42 | D | ASME VIII, UG = 102 1s) a) avr 510, 5.36 ‘a3 )C ASME Vill, UG - 100 19D | ApI510 ‘44 A ASME Vill, UG ~ 100 20|D | API510, 6.2 lack paragraph 45D | Application of API 3.1 2i| A | ASME VIII, Fig. UCS = 66. 46D | Application of UG = 100 fa) 22) [apt 510, 5.2 and UCs - 66 a7) a [apr 510, 57e. 23_B | API510,5.2 48D | UCS - 56, di, 2,5 24) A 1 IRE Chapter ff 49 | DT APT 510, 6.6 25__B ASME VIII, UW - 40 a2 50D 1 APT510, 1.1 [2a 6 | at 510. 1.1 tast paragraph |