Top 93 Latest API 570 Exam Questions and Answers

Top Most Important 93 Latest API 570 Exam Questions and Answers

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1. API Recommended Practice 574, Inspection of Piping, Tubing Valves, and Fittings, does not cover.

a. Control valves.
b. Piping smaller than 2” NPS
c. Tubing smaller than 1.5” diameter
d. Fittings smaller than 2” NPS

2. The refining industry generally uses what type piping for severe service?

a. Brass
b. Cast
c. Seamless
d. Longitudinal seam welded

3. Piping made by rolling plates to size and welding the seams is larger than_____ inches outside diameter.

a. 10
b. 16
c. 14
d. 12

4. Steel and alloy piping are also manufactured to standard dimensions in nominal pipe sizes up to _____inches.

a. 24
b. 36
c. 48
d. 50

5. Steel and alloy piping are also manufactured to standard thicknesses designated as schedules in nominal pipe sizes up to _____inches.

a. 24
b. 36
c. 48
d. 50

6. The actual thickness of wrought piping may vary from its nominal thickness by a manufacturing under tolerance of as much as______ percent.

a. 12.5
b. 12.0
c. 10.0
d. 10.5

7. Cast piping has thickness tolerance of +___inch and – ____inch.

a. 1/16,0
b. 1/16, 1/16
c. 1/32, 1/32
d. 3/64, 0

8. For all nominal pipe sizes of ____ inches and smaller, the size refers to the nominal inside diameter.

a. 10
b. 12
c. 14
d. 16

9. Under tolerance of welded pipe often used in refinery service is _____ inch.

a. 0.125
b. 0.050
c. 0.010
d. 0.005

10. For what service is cast iron piping normally used?

a. Non-hazardous service, such as lube oils.
b. Non-hazardous service, such as water.
c. Corrosive service, such as acids.
d. Non-corrosive service, such as low temperature caustic.

11. Tubing is generally seamless drawn, but it may be welded. Its stated size is its actual:

a. Outside radius
b. Inside diameter
c. Outside diameter
d. Inside radius

12. There are many type valves. Which is incorrect valve type listed below?

a. Style valve
b. Gate valve
c. Check valve
d. Globe valve

13. What type valve is normally used in a fully open or fully closed position?

a. Gate
b. Globe
c. Slide
d. Plug

14. What type gate valves have body and port openings that are smaller than the valves’ end opening.

a. Borda tube gate valves
b. Reduced-port gate valves
c. Weir gate valves
d. Sluice gate valves

15. What type of gate valve should not be used as block valves associated with pressure relief devices?

a. It is normally used as block valve
b. It is commonly used to regulate fluid flow
c. It is ordinarily used to measure pressure drop
d. It is frequently used in place of a slide valve.

16. What is a globe valve used for?

a. Sluice gate valves
b. Weir gate valves
c. Borda tube gate valves
d. Reduced-port gate valves

17. A plug valve consists:

a. Of a slide or slides that operate perpendicularly to the flow and move on rail guides to interrupt flow.
b. Of a ball with a hole in it that fits into the valve body and interrupts the flow of material.
c. Of a circular gate that operates in and out in the body to interrupt flow.
d. Of a tapered or cylindrical truncated cone with a slot fitting into a correspondingly shaped seat.

18. What type of valve depends upon a spherical type gate has a hole in it and is rotated to open or close it?

a. Diaphragm valve
b. Plug valve
c. Globe valve
d. Ball valve

19. What are check valves normally used for?

a. They are generally used in erosive or high-temperature service.
b. They are used to automatically prevent backflow.
c. They are commonly used to regulate fluid flow.
d. They are used for conditions that require quick on/off or bubble tight service.

20. What are slide valves generally used for?

a. They are used to automatically prevent backflow.
b. They are used for conditions that require quick on/off or bubbletight service.
c. They are generally used in erosive or high-temperature service.
d. They are commonly used to regulate fluid flow.

21. What type of joint listed below would you NOT used in a 300 psi pipe system?

a. Lap-joint flanged
b. Welded
c. Bell-and-spigot
d. Weld-neck flanged

22. What type of pipe joint is generally limited to piping in non-critical service and has a nominal size of 2 inches or smaller?

a. Flanged joint
b. Threaded joint
c. Socket-weld joint
d. Butt-welded joint

23. Socket welded joints are usually used in nominal pipe size of _______ or smaller.

a. 4”
b. 3”
c. 2.5”
d. 2”

24. Which of the joints listed is the most common found in the petroleum industry?

a. Compression joints
b. Butt-welded joints
c. Bell-and-spigot joints
d. Sleeve joints

25. The primary purpose of piping inspection is to:

a. Satisfy the requirements of jurisdictional regulations.
b. Achieve ate the lowest cost, piping that is reliable and has the desired quality.
c. Ensure plant safety and reliability; also achieve desired quality assurance.
d. Produce a piping system that meets minimum design and serviceability requirements.

26. Adequate inspection is a prerequisite for maintaining piping:

a. In a leak free condition
b. Satisfactory to the owner-user
c. In a satisfactory operating condition
d. In a safe, operable condition

27. OSHA 1910.119 mandates that:

a. Piping be inspected to a code or standard such as API 570.
b. Owner/user adopt API 570.
c. Water piping be inspected the same as chemical piping.
d. The owner/user immediately shut down corroded piping system.

28. Regularly requirements usually cover only those conditions that affect:

a. Pollution
b. Operations
c. Safety
d. Maintainance

29. The single most frequent reason for replacing piping is:

a. An over-zealous Inspector
b. In-service cracking
c. H2S deterioration and erosion
d. Thinning due to corrosion

30. On piping that is operating, the key to effective monitoring of piping corrosion is identifying and establishing __________________.

a. L.O.L’s
b. J.L.G’s
c. T.M.L’s
d. C.U.I’s

31. You are asked to recommended a method for determining the thickness of a pipe that has 1.5” of insulation, with a vapour barrier, and aluminium jacketing on it. Problems can occur when tightening bolts to correct leaking flanges in-service. Which of the below is not one of these problems?

a. Bolt interactions
b. Yielding due to overload
c. Flange deflection
d. None of the above

32. Which one of the following is not a factor for consideration when establishing corrosionmonitoring programs?

a. Accessibility
b. Circuitisation
c. Transducer diameter
d. Risk classification

33. A greater loss in metal thickness will usually be observed near a restriction or change in direction in a pipe line. What usually causes this?

a. The effects of turbulence or velocity
b. The effects of stagnation or fretting
c. The effects of corrosion or declination
d. The effects of oxidation or waning

34. What type of problem would you expect to find in catalyst, flue-gas, and slurry piping on a Fluid Catalytic Cracking Unit.

a. Embrittlement
b. Cracking
c. Corrosion
d. Erosion

35. Stainless steel such as type 304 18 Chr.-8 Ni in the presence of temperature above 100° F. may crack because of the presence of:

a. Nitrates
b. Sulphides
c. Chlorides
d. Dissolved oxygen

36. A 2” diameter line is injecting a product into an 8” diameter pipe. What type of deterioration would you expect to take place?

a. Accelerated corrosion or erosion
b. Long term corrosion
c. Chloride cracking
d. Dissolved oxygen pitting.

37. An inspector is checking a piping system that has had problems with isolated corrosion at or near the welds of piping shoes. Without knowing what product is in the line, what would be the best answer below for the problem?

a. The shoes are at high stress points and thus leaks occur.
b. The welds of the shoes to the pipe were too large.
c. The welds of the shoes to the pipe burned nearly through the pipe.
d. The shoes are acting as cooling fins and causing localized temperature differences.

38. What type of problem would you expect in piping containing Amine?

a. Dissolved oxygen cracking
b. Stress corrosion cracking
c. Galvanic corrosion
d. Crevice corrosion

39. What area do you consider to be of most concern when inspecting a piping system?

a. Underneath insulation on lines operating at temperatures above 2000F.
b. In a straight run pipe containing motor oil
c. At and/or downstream of a chemical injection point.
d. Underneath insulation on lines operating below 250F.

40. Leaks in utility piping (water, steam etc.) are:

a. Only of minor concern and may be disregarded.
b. Always dangerous but losses are negligible.
c. Seldom hazardous but they do result in losses.
d. Usually hazardous and losses result.

41. Where do many (maybe the majority) of leaks occur in pipelines?

a. Straight runs of piping
b. Flanges or packing glands
c. Changes of direction of piping
d. Downstream of injection points

42. The prompt repair of __________ will often prevent serious corrosion or erosion of gasket surface or packing glands.

a. Supports
b. Leaks
c. Guides
d. Welds

43. The deformation of a vessel wall in the vicinity of a pipe attachment; expansion joints that are not performing properly; a pipe dislodged from its support; etc are evidence of:

a. Misalignment
b. Leaks
c. Weld problems
d. Drips

44. Spring hanger loading should be checked under:

a. Elevated temperature conditions
b. Both cold and hot conditions
c. Sub-zero temperature conditions
d. Ambient temperature conditions

45. An inspector finds concrete fireproofing around a structural steel column with openings (cracks). The inspector suspects that water may be entering. What should the inspector do?

a. The inspector should ask his supervisor what he should do.
b. All the fireproofing should be stripped from the column.
c. Enough fireproofing should be removed to determine the extent of the problem.
d. No action should be taken.

46. If a steel column in a pipe support rack is corroded. What should the inspector do?

a. Have the corrosion products cleaned off and have the column painted
b. No action is required
c. Thickness measurements should be taken to determine whether enough metal is left to safely support the load.
d. Call a piping engineer.

47. How do you inspect non-destructively for loose or broken foundation bolts?

a. Break out the concrete around the foundation bolt.
b. Hammer the bolts vertically with a hammer.
c. Lightly rap the bolts sideways with a hammer while holding a finger against the opposite side.
d. Radiograph the foundation.

48. If you find a slotted hole in a base-plate, what would this indicate to you?

a. It indicates that the craftsman making the hole was not sure of it exact location.
b. It indicates that the base-plate may have been designed to accommodate expansion.
c. It indicates that the base-plate was possibly made to be used in multiple locations.
d. It indicates that the base-plate had two holes side by side punched in it by mistake.

49. As an inspector, you find a 6” diameter pipe line that is vibrating and swaying. What is one of the most important things you would check for and where would you check?

a. Fireproofing on the supports should be checked for spalling and breaking.
b. Welds should be inspected for cracks, particularly at points of restraint.
c. Base-plates of the pipe supports should be checked to see if the bolts are tight.
d. Valves in the system should be checked to insure they are not vibrating open/closed.

50. An insulated pipe shows evidence of defects in the jacketing covering the insulation. You suspect that water may be getting in through the defects. What you would do?

a. Strip the pipe line complete to allow 100% inspection and renewal of the insulation.
b. If no discoloration is present to indicate corrosion (rust), no action is required
c. Strip enough insulation to determine the extent and severity of possible corrosion.
d. Strip at least 50% of the insulation from the pipe to allow examination.

51. While inspecting an underground pipe line right-of-way, you find a discolored spot on the ground near a road that crosses the right-ofway. Which of the items below would be the course you would follow?

a. The inspector should make a note for the records and have the area checked at some future time for possible leakage.
b. It is not unusual to have discoloration on pipe line right-of-ways. If the discoloration is not wet and there is no evidence of leakage, no action is required.
c. The inspector picks up material from the discolored area. If it smells okay and no there is no reaction on the skin, the area should pose no problem.
d. The discoloration should be investigated as a possible spill. Soil or liquid samples should be checked to see if it is corrosive to the underground.

52. An increase in pump pressure at the pump accompanied by a decrease in flow in a pipe line downstream is an indication of _________.

a. Leakage
b. A broken line
c. Effluence
d. Fouling

53. Ultrasonic instruments are widely used for thickness measurements and are used extensively by inspection organizations. If a transducer is not equipped with “high temperature” delay-line material, it can be damaged by temperatures over ________ °F.

a. 150
b. 1000
c. 250
d. 300

54. What would you expect to happen if you were taking UT readings on piping that was operating higher than 2000F?

a. The thickness readings could be at least 10% higher or lower.
b. The thickness readings would not be influenced.
c. The thickness readings could be about 1% to 5% higher depending on the temperature.
d. The thickness readings would be 15% higher or lower.

55. An insulated piping system needs to have its pipe wall thickness checked. The owner-user does no want holes cut in the insulation for UT measurements and they do not want to shut down. What would you do to obtain thickness readings?

a. AE
b. MT
c. ET
d. RT

56. Reduction of strength of the metal in a pipe, scaling, bulging, metal deterioration or complete failure are all symptoms of:

a. Excessive pressure
b. Low temperature
c. Excessive temperature
d. Blocked effluent

57. Points of probable external corrosion of underground piping can be located by a series of measurements of the:

a. Electrical resistance of surrounding soil or by measurement of pipe-to-soil electrical potential
b. Wattage of the surrounding piping or by measurement of pipe-to-conduit electrical resistance.
c. Potential of the cathodic protection or by wattage of the pipe-to-soil electrical resistance.
d. Volt-amps readings of the surrounding soil or by measurement of pipe-to-pipe electrical potential.

58. One of the most important things that an inspector must do before he actually goes out to make an inspection is:

a. Make sure all electrical potentials have been checked and shut off where necessary to prevent contact.
b. Check all lines to just before the point they enter the unit limits to make sure only the unit lines are inspected.
c. Review the condition of transportation (cars, trucks, scooters, bicycles etc.) to make sure transportation is not interrupted.
d. Review the records of previous inspections and of inspections conducted during the current operating period.

59. When making a visual internal inspection of a pipe and fouling is found, what should the inspector do?

a. Make a note to include in the records; another inspector at the next period may want to investigate further.
b. Check with the operators to see if it is causing problems, if no problems no further action is necessary.
c. Cleaning should be considered, also, the deposits should be checked to find their origin.
d. Have the line cleaned completely immediately, make a complete write up for records.

60. The locations on piping most susceptible to cracking are:

a. Changes of directions
b. Welds
c. Straight runs
d. Flange bolts

61. When checking austentic materials for cracks using PT methods only liquid penetrants:

a. With low or no nitrides should be used.
b. With low or no carbides should be used.
c. With high or medium chlorides should be used.
d. With low or no chlorides should be used.

62. What type of defect would you expect to find at the problem of a groove of a ring joint flange made from ASTM-347 Stainless Steel?

a. pits
b. cracks
c. hydrogen blisters
d. fouling

63. Valves should be dismantled at specified intervals to permit examination of all internal parts. Body thickness should be measured at locations that were inaccessible before dismantling, particularly at:

a. The disk seating surfaces
b. Flange where the bonnet is attached.
c. Locations that show evidence of corrosion or erosion.
d. Random locations throughout the valve.

64. Bodies of valves that operate in severe cyclic temperature service should be checked internally for:

a. Erosion
b. Fouling
c. Cracks
d. Pitting

65. Gate valves should be measured for thickness between the seats, since serious deterioration may have occurred because of:

a. Cracks
b. Turbulence
c. Fouling
d. Corrosion

66. Why is the area between the seats of a gate valve a weak location?

a. Pitting can occur at this location while the valve is operating open.
b. Fouling can occur at this location where there is a possibility of high velocity.
c. The body of the valve is thinner in this location.
d. The wedging action of the disk when is seats causes strain in this area.

67. After a valve has been inspected, repaired, and reassembled, what should be done next?

a. It should be plasited inside to prevent corrosion and returned for reinstallation.
b. It should be returned to the job for reinstallation
c. It should be painted and the inlet and outlet capped.
d. It should be tested to API 598 requirements.

68. In addition to checking the gasket surfaces of flanges for defects, and checking for corrosion and erosion, which of the following additional checks:

a. The rating of the flanges must be checked to make sure that they are both class 150 and they both have the same number of bolt holes.
b. The bolts should be checked for proper specification, stretching and corrosion. The gasket must be of the proper type and material.
c. The flange bolt holes must match and at least one flange must be a class 15 or 30.
d. The bolts should be machine grade and brand-new. The gasket must be a minimum of a spiral wound grafoil filled.

69. A weld is being made in carbon steel piping carrying Amine (MEA). What should the inspector check in addition to insuring that the weld is proper and meets specification?

a. The class of the piping, i.e. 150,300,600 etc should be verified.
b. Amine can cause environmental cracking; the weld should be checked for hardness.
c. Welds on the weld hangers should be made checked and the results recorded.
d. Check the seating surface and lightness of the joint by WFMT.

70. Welded joints in carbon steel and carbonmolybdenum steel exposed to elevated temperatures of 8000 F or over may be subject to:

a. Hydrogen attack
b. Graphitization
c. Environmental cracking
d. Graphitic corrosion

71. Which one of the listed is not a cause for a threaded joint leak?

a. Use of the proper lubricant
b. Improper assembly or loose threads
c. Corrosion or poor fabrication
d. Cross threading or dirty threads at assembly

72. Why should a leaking threaded joint not be tightened while the system is in service under pressure?

a. An undetected crack in a thread root might fail and cause a release of product.
b. Tightening may exacerbate the hardness of the threads and cause leaks.
c. The pressure on the gasket may be so great that it causes a failure and thus leaks.
d. Supports may fail if the threaded joint is lightened-tension on the supports.

73. What type of pipe joint must not be used without adequate axial restraint on the piping?

a. Threaded joints
b. Flanged joints
c. Clamped joints
d. Welded joints

74. Which of the following is not a cause of misalignment?

a. Inadequate provision for expansion or broken and/or defective anchors or guides.
b. Too many bolts in the flanges or bolts with the wrong material.
c. Excessive friction on sliding saddles or broken or corroded rollers.
d. Excessive operating temperatures or broken or improperly adjusted hangers.

75. Where excessive vibration or swaying was noted in a piping system during operation, an inspection should be made for points of _________ and __________ _________ and for cracks in welds at locations that could not be inspected during operation.

a. Graphitization, graphitic corrosion
b. Scaling, internal oxidation
c. Abrasion, external wear
d. Rusting, hydrogen blisters

76. Piping that has been in service or had hot spots of 8000F and above should be checked for creep or deformation with time under stress by:

a. Using a transit to establish correct alignment and elevation or plumbness.
b. Measuring the outside diameter of the pipe and comparing established data for life.
c. Pressure testing the piping to ensure it is serviceable.
d. Examining the piping with acoustic emission equipment.

77. Special attention should be given to small connections such as vents, bleeders, any type of small nipple. One method for successfully checking the condition and the thickness of nipples is the use of:

a. RT
b. AE
c. MT
d. PT

78. A pressure test for piping, in most cases is a:

a. Leak test
b. Stress test
c. Ebullition test
d. Strength test

79. Any system being tested needs to be completely isolated to:

a. Prevent the testing medium from the entering connecting lines.
b. Insure only the system in question is tested.
c. Minimize the amount of work by limiting the lines in the test.
d. Stop the testing medium from being contaminated with material from other lines.

80. If a pressure test is conducted with air or if excess air is trapped in a system that is being hydrostatically tested, a failure of the system will be:

a. Less violent than in a totally liquid filled system because it does not expand as rapidly as a hydraulic medium.
b. Easy to manage because the air will prevent liquid from being spread of the area and possibly causing an environmental incident.
c. More violent than in a totally liquid filled system because of the expansion of the compressible medium.
d. Of little consequence since it the failure will be similar to air leaking from a nail hole in a motor car tire inner tube.

81. Which of the following materials NOT be commonly used for a pressure test?

a. Water with or without an inhibitor, freezing-point depressant, or wetting agent.
b. Hydrogen, hydrogen sulphide, gasoline, liquid propane or weak hydrogen chloride.
c. Liquid products normally carried in the system, if the are not toxic or likely to cause a fire in the event of a leak or failure.
d. Steam, air, carbon dioxide, nitrogen, helium or another inert gas.

82. In which of the following systems would water be a questionable test medium?

a. Gasoline reflux lines, propane piping, and butane systems.
b. Diesel fuel systems, gas oil systems, and kerosene systems.
c. Acid lines, cryogenic systems, and air drier systems.
d. Reboiler oil systems, boiler piping, and steam turbine lines.

83. What should be considered when testing carbon steel piping during cold weather or if cold fluids are used in the testing?

a. The transition temperature of the steel should be considered to prevent brittle failure.
b. The test medium may freeze if it escapes during test.
c. The transition temperature of the medium should be considered for brittle cracking.
d. The translation temperature of the test medium may freeze the test gages.

84. What is the preferred medium for a pneumatic test?

a. A flammable gas
b. An inert gas.
c. Hydrogen gas
d. Propane gas

85. What type of piping usually has a pressure recorder attached in which a permanent record of the test is made?

a. Boiler piping
b. Underground piping
c. Light hydrocarbon unit piping
d. Operating unit piping

86. Which of the following piping should NOT be hammer tested?

a. Pipe made from steel on a Fluid Catalytic Cracking Unit.
b. Steel pipe and lines off a crude tower on a crude still.
c. Cast iron and stress-relieved lines in caustic and corrosive service.
d. ASTM A-106 Grade A pipe on a catalytic Reforming Unit.

87. New construction piping should meet the requirements of __________ as a minimum.

a. API 571
b. ASTM A-53
c. ASME B-31.3
d. ASME Std 607

88. When ASME B31.3 cannot be followed because of its new construction orientation, which document should guide the Engineer/Inspector?

a. API 574
b. API 575
c. ASME VIII
d. None of the above

89. A piping Engineer must be:

a. A degreed Mechanical Engineer
b. Acceptable to the owner/user
c. Qualified as an API 570 Inspector
d. A single entity(i.e., cannot be more than one person)

90. Which of the following is not a re-rating?

a. A “scab” patch causing a decrease in design pressure.
b. A de-rating for corrosion.
c. A change in materials to a lower stress value.
d. An increase in the MAWP of the system.

91. A “piping system” does not include which of the following items?

a. Piping supports
b. Fittings
c. Dents
d. Valves

92. The boundary of a piping circuit should be sized:

a. By the inspector.
b. To provide for accurate record-keeping and field inspection
c. To minimize TML’s
d. To remove the threat of CUI

93. When using statistical methods to assess corrosion in piping, it is very important to ________.

a. Properly select components to
b. Hydrotest all piping
c. Ensure an adequate number of TML’s are placed.
d. Both a & c, above.

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