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API 653 Study Guide Questions with
Solved Answers
1.API 653 covers which of the following activities? a) Tank Design b) Tank Fabrication c) Tank Operation d) Tank Reconstruction: d) Tank Reconstruction 2.Corroded roof plates on a fixed-roof tank shall NOT be less than: a) Designers Recommendation b) 0.090" thick averaged over any 100 sqin. c) 0.500" at any point. d) tmin averaged over critical length "L" Dimension: b) 0.90" thick averaged over any 100sqin. 3.A new nameplate shall be added to a tank after: a) either major alterations or tank reconstructions. b) either major alterations or tank reconstruction. c) it has been relocated. d) it has been reconstructed.: d) it has been reconstructed. 4.For a reconstructed tank, the shell thickness readings used to determine the allowable liquid height must have been taken within the last: a) 30 days. b) 60 days. c) 90 days. d) 180 days.: d) 180 days. 5.The impressed current sources of a cathodic protection system should be checked (to see if still operating) every: a) month b) two months. c) six months. d) year.: b) two months 6.Which of the following is part of the "critical zone"? a) the bottom within 3" of any roof support column b) the bottom within 3" of the shell
2 / 32 c) the bottom 3" of the lowest shell course d) the frangible roof to shell weld: b) the bottom within 3" of the shell 7.A tank is 20 years old and has a bottom thickness of 0.170" original bottom thickness was 0.250. determine the interval for the next internal inspection? a) 10 years b) 15 years c) 17.5 years d) 20 years: c) 17.5 years 8.Widely catered pits in a tank shell can be ignored if the extent of the pitting does not exceed: a) 2 pits in any 8 inches. b) 1 inch in any 8 inches. c) 2 inches in any 8 inches. d) 1 inch in any vertical 8 inches. e) 2 inch in any vertical 8 inches: e) 2 inch in any vertical 8 inches. 9.Which of the following is an advantage of the galvanic cathodic protection system? a) Annual maintenance costs are generally low. b) A single anode covers large surface areas c) the Effective life of the anodes is usually 50 years. d) It is easy to test the system's effectiveness.: a) annual maintenance costs are generally low 10.Hot taps are permitted: a) anywhere on the tank. b) anywhere on the tank provided the tank is gas free. c) only in the liquid section of tank. d) only in the liquid section of tank provided the product flash point is above 250*F.: c) only in the liquid section of tank. 11.An API 653 hydrotest shall be held for at least: a) 4 hours. b) 8 hours c) 12 hours d) 24 hours: d) 24 hours 12.During a tank repair, if API 653 conflicts with the design standard,
4 / 32 a) most stringent standard b) design standard c) API 653 d) either standard based on the inspector"s judgment: c) API 653 13.Which of the following activities is considered an alteration in API 653? a) the addition of a shell lap patch b) the addition of a floor lap patch c) the addition of a shell insert patch d) the addition of 16 NPS nozzle e) the addition of a tank bottom lining: d) the addition of 16 NPS nozzle 14.Repaired or replaced bottom welds shall be examined with either a vacuum box or by using: a) tracer gas test b) radiographic and visual methods c) either magnetic particle or liquid penetrant methods d) a light diesel oil test: a) tracer gas test 15.Welding procedures for tank repairs to the shell should be qualified in accordance with: a) API 650 b) original construction standard c) ASME section IX d) AWS D1.1: C) ASME section IX 16.A lap patch is installed on a tank bottom and the patch plate crosses a tank bottom weld. What is the minimum dimension for this patch plate? a) any size b) 6" c) 10" d) 12": d) 12" 17.API 653 is intended to be used by owner/operator organizations that: a) employ tank inspectors b) have access to engineers and inspectors c) have a quality control manual d) have both inspection and repair organizations: b) have access to engineers and inspectors
5 / 32 18.Which of the following tests are required when qualifying a weld proce- dure? a) UT the complete assembly b) a minimum of 6 bend tests c) radiograph the completed assembly d) a minimum of 2 tension tests: d) a minimum of 2 tension tests 19.Calcining of the tank concrete ringwall can occur when the concrete is: a) exposed to a high temperature b) attacked by an aggressive chemical c) cracked and the reinforcement is exposed to atmosphere d) exposed to freezing temperatures: a) exposed to a high temperature 20.Which of the following does NOT increase the risk of brittle fracture? a) change to a product with a higher specific gravity b) change to a lower operating temperature c) change to product with increased viscosity d) increasing the allowable liquid height: c) change to product with increased viscosity 21.Which type of external floating-roof is the most susceptible to sinking? a) pan b) pontoon c) double deck d) internal aluminum: a) Pan 22.All new materials used for repairs must conform to: a) latest edition of API 650 b) original construction standard c) current construction standard d) current applicable standard: d) current applicable standard 23.Which of the following is NOT considered one of the major types of inspection records? a) operation history b) inspection history c) construction data d) repair history: a) operation history
7 / 32 a) decrease the internal inspection interval b) repair with a lap patch over corroded area c) install coating per API 652 d) lower the allowable liquid level: d) lower the allowable liquid level 30.The qualifications for the person performing the external inspection in- clude: a) being knowledgeable of the specific tank operation b) being able to read a Jaeger 3 eye chart c) being certified as a API 653 Inspector d) having a high school education: c) being certified as a API 653 Inspector 31.Which type of settlement causes the greatest stress on the shell to bottom weld? a) out of plane b) planar tilt c) uniform d) ridged body tilt: a) out of plane 32.Shell lap patches are only allowed on: a) tanks made from Group IV, V,& VI materials b) the upper three courses c) plates that do not exceed 1/2" d) plates where the membrane stress does not exceed 700 ksi: c) plates that do not exceed 1/2" 33.A welders qualification expires if: a) he has not welded using the procedure within 6 months b) he has not welded using the process within 6 months c) he has not welded within 3 months d) any of his welds fail to meet the primary code acceptance standards: b) he has not welded using the process with in 6 months 34.During a tank reconstruction, a 0.750" shell course can be dismantled by cutting: a) through the welds b) a minimum of 1" away from the existing weld c) a minimum of 2" away from the existing weld
8 / 32 d) a minimum of 6" away from the existing weld: d) a minimum of 6" away from the existing weld 35.Prior to hot tapping, how many thickness readings are required at the proposed nozzle location? a) 1 b) 2 c) 4 d) 8: c) 4 36.Which of the following new welds does NOT need to be examined by magnetic particle or liquid penetrant methods? a) the reinforcing plate to shell welds b) stress relieved assemblies welds c) the insert plate to shell welds d) the nozzle neck to shell welds: c) the insert plate to shell welds 37.Pitted roof plates in a floating roof shall NOT be less than: a) 0.050" thick b) 0.090" thick c) what will cause a penetration by the next inspection d) designers recommendation: c) what will cause a penetration by next inspection 38.Fatigue will NOT occur in carbon steel if stresses are below the : a) transition limit b) endurance limit c) hardening limit d) speed limit: b) endurance limit 39.In a corroded area "T2" the least thickness exclusive of pits, shall be greater than or equal to: a) 60% of t-min plus corrosion allowance to next inspection b) 60% of t-min c) 0.100" plus corrosion allowance to inspection d) 0.100": a) 60% of t-min plus corrosion allowance to next inspection 40.The qualifications for the person performing the routine in-service in- spections includes:
10 / 32 b) being able to read a jaeger 2 eye chart c) being certified as an API 653 inspector d) being able to leap a truck over the tank dike: a) being knowledgeable of the tank operation 41.Prior to the work, all alterations must be authorized by the: a) Inspector b) engineer c) both the inspector and engineer d either the inspector or engineer: b) engineer 42.The grain structure of weld metal is most similar to that found in: a) castings b) forgings c) extrusions d) rolled plate: a) castings 43.For a tank without a release protection barrier the maximum interval for for the second internal inspection is: a) 1/2 reaming life of bottom b) 1/2 remaining life of shell c) lesser of 10 years or 1/2 bottom life d) lesser of 20 years or full bottom life: d) lesser of 20 years or full bottom life 44.The maximum interval for the External Inspection is: a) 1/4 of remaining life of shell b) 1/2 life of shell c) lesser of 5 years or 1/4 life of shell d) lesser of 10 years or 1/2 life of shell: c) lesser of 5 years of 1/4 life of shell 45.Existing weld joints in a reconstructed tank shall meet the minimum re- quirements of: a) latest edition of API 650 b) as built standard c) current construction standard d) applicable standard: b) as built standard 46.Corrosion has been found on a tank bottom. The calculated remaining life on a tank bottom is 30 years. What is the Maximum interval for the next
11 / 32 internal inspection (no RBI & no RPB)?
13 / 32 a) lack of fusion b) incomplete penetration c) overlap d) wagon tracks: c) overlap 53.An in-service tank should never have a shell plate thinner than: a) 0.050" b) 0.100" c) 0.125" what is allowed by AMSE section VIII, Div 2: b) 01.00" 54.A tank with cathodic protection has a second bottom added above the old floor. This tank may: a) experience accelerated on the lower floor b) experience accelerated corrosion on the upper floor c) experience accelerated corrosion on the product side d) experience a significant decrease in corrosion on both floors: b) experience accelerated corrosion on the upper floor 55.CUI is an inspection concern for insulated carbon steel equipment that operates between: a) 10 to 350F b) 25 to 250F c) 140 to 350F d) 140 400F: a) 10 to 350F 56.During welding of carbon steel, which of the following best describes the heat affected zone? a) base material that was not melted but heated above 1350F b) base material that was not melted but heated above the upper transforma- tion temp. c) base material that was not melted during the welding process d) weld metal that cooled rapidly below the lower transformation temperature- : a) base material that was not melted but heated above 1350*F 57.New reinforcement plates are tested using: a) a hydrotest b) an air test
14 / 32 c) an vacuum box d) tracer gas test: b) an air test 58.Added to water, which of the following make strong electrolytes? a) bromides and sulfides b) chlorides and salt c) chlorides and sulfides d) sulfides and salt: b) chlorides and salt 59.Dry pyrophoric material can cause: a) cracking b) general metal loss c) ignition d) pitting: c) ignition 60.Non-essential welding variables must be recorded: a) only on the PQR b) only on the WPS c) only on the WPQ d) on both the PQR and WPS: b) only on the WPS 61.As soil resistance increases the: a) cathodic protection is easier to achieve b) stray currents become an increasing concern c) the potential for corrosion decreases d) the potential for corrosion increases: c) the potential for corrosion decreases 62.When a liquid penetrant exam is conducted during a tank repair, the exam should be conducted in accordance with: a) AMSE section I b) AMSE section V c) AMSE section VIII d) AMSE section IX: b) AMSE section V 63.Which of the following activities have a follow-up hydrotest? a) installing a patch plate on the tank bottom b) reconstructing a tank c) changing to a product with a higher specific gravity d) lowering of tank operation temperature: b) reconstructing a tank
16 / 32 c) the source side d) a shim: c) the source side 70.Excessive weld reinforcement is found on an existing tank shell. What is the required repair plan? a) remove reinforcement to meet API 650 requirements b) remove reinforcement to meet API 653 requirements c) evaluate to determine if there are any negative affects on seal parts d) no evaluation required: c) evaluate to determine if there are any negative affects on seal parts 71.If a new nameplate is required by API 653, the nameplate shall: a) be attached adjacent to the existing nameplate b) replace the existing nameplate and be attached in location of existing nameplate c) have letters not less than the 1/8" d) be 5/32" thick: a) be attached adjacent to the existing nameplate 72.To obtain a joint efficiency of 1.0 on a riveted tank, the area being evaluated must be at least: a) 1" away from the rivets b) 2" away from the rivets c) 6" away from the rivets d) 12" away from the rivets: c) 6" away from the rivets 73.A 120' diameter tank is hydrotested. How many survey points should be used to check for settlement? a) 8 b) 12 c) 13 d) 32: b) 12 74.According to API 653 the minimum diagnostic length of weld in radiograph is: a) 3" b) 6" c) 9" d) 12": b) 6"
17 / 32 75.When adding new shell penetrations, when shall an insert plate be used? a) For all penetrations larger than 2 NPS. b) For all penetrations when the shell plate is thicker than 1/2". c) For all penetrations in which the shell plate material does not meet the current design metal temperature. d) For all penetrations that are greater than 2 NPS, and the shell plate exceeds 1/2", and the shell plate material does not meet the current design metal temperature.: d) For all penetrations that are greater than 2 NPS, and the shell plate exceeds 1/2", and the shell plate material does not meet the current design metal temperature. 76.When removing a weld defect, cavities resulting from gouging or grinding shall be examined visually and by the : a) magnetic particle methods. b) liquid penetrant methods. c) magnetic particle or liquid penetrant methods. d) ultrasonic methods.: c) magnetic particle or liquid penetrant methods. 77.The resistance of the grounding connections should not exceed: a) 1 ohm. b) 10 ohms. c) 25 ohms. d) 7000 ohms.: c) 25 ohms. 78.The welder must follow which variables on the WPS? a) Only the non-essential variables b) Only the essential variables c) Both the essential & non-essential variables d) None of the variables. All variables are optional for a qualified welder.: c) Both the essential & non-essential variables 79.The maximum size of shell lap patch is: a) 12" in diameter. b) 24" square. c) 48" vertical and 72" horizontal. d) Unlimited.: c) 48" vertical and 72" horizontal. 80.A major cause of tank lining failures is inadequate:
19 / 32 cathodic protection system (as compared to a galvanic system)?
20 / 32 a) Effective for tanks of all sizes. b) Safety aspects are minimized. c) Maintenance & Operating costs are minimal d) Requires infrequent monitoring: a) Effective for tanks of all sizes. 87.Welders & welding operators performing tank shell repairs should be qualified in accordance with: a) API 650. b) original construction standard. c) AMSE Section IX. d) the repair organization's procedures.: c) AMSE Section IX. 88.Which of the following welds does not require welder identification? a) Bottom fillet weld b) Horizontal shell weld c) Nozzle reinforcement pad-to-shell weld d) Flange-to nozzle weld: d) Flange-to nozzle weld 89.Personnel performing radiographic examination shall be: a) certified to ASNT SNT-TC-1A. b) certified by the owner/operator. c) evaluated by the owner to determine the technician's competency. d) experienced having at least 2 years of similar work experience.: a) certified to ASNT SNT-TC-1A. 90.Repairs to tank fillet welds shall be: a) completely radiographed or ultrasonically tested. b) spot radiographed at Authorized Inspector's direction. c) examined with either magnetic particle or liquid penetrant examinations. d) examined by the appropriate nondestructive examination method.: d) exam- ined by the appropriate nondestructive examination method. 91.During a repair or alteration, new welds in shell plate greater than 1" thick shall be: a) examined by radiographic methods. b) examined by radiographic and visual methods. c) examined by radiographic, visual, and either MT or PT.
