Top Most Important 93 Latest API 570 Exam Questions and Answers
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Q1. API Recommended Practice 574, Inspection Practices for Piping System Components, does not primarily cover:
A. Control valves
B. Piping inspection practices
C. Tubing used in process service
D. Fittings and flanges
Correct Answer: A
Explanation: API 574 covers inspection practices for piping, tubing, valves, and fittings, but detailed control valve design and performance are not its main scope.
Q2. The refining industry generally uses which type of piping for severe service?
A. Cast iron piping
B. Seamless piping
C. Brass piping
D. Plastic-lined piping
Correct Answer: B
Explanation: Seamless piping is preferred for severe refinery service because it has no longitudinal weld seam, reducing one potential weakness.
Q3. Piping made by rolling plate to size and welding the seam is generally used for pipe larger than approximately:
A. 10 inches outside diameter
B. 12 inches outside diameter
C. 16 inches outside diameter
D. 6 inches outside diameter
Correct Answer: C
Explanation: Large-diameter pipe may be fabricated by rolling plate and welding the seam, especially when standard seamless pipe is impractical.
Q4. Steel and alloy piping are manufactured to standard dimensions in nominal pipe sizes up to:
A. 12 inches
B. 24 inches
C. 36 inches
D. 48 inches
Correct Answer: D
Explanation: Standard pipe dimensions are commonly available up to NPS 48.
Q5. Steel and alloy piping are manufactured to standard thicknesses designated as schedules in nominal pipe sizes up to:
A. 36 inches
B. 10 inches
C. 14 inches
D. 16 inches
Correct Answer: A
Explanation: Standard schedule thicknesses are commonly applied through NPS 36.
Q6. The actual thickness of wrought piping may vary from nominal thickness by a manufacturing undertolerance of as much as:
A. 10 percent
B. 12.5 percent
C. 15 percent
D. 5 percent
Correct Answer: B
Explanation: A common manufacturing undertolerance for wrought pipe wall thickness is 12.5 percent.
Q7. Cast piping commonly has a thickness tolerance of:
A. +1/32 inch and −1/32 inch
B. +1/16 inch and −1/16 inch
C. +1/16 inch and −0 inch
D. +0 inch and −1/16 inch
Correct Answer: C
Explanation: Cast pipe typically has a positive tolerance allowance but no negative tolerance.
Q8. For nominal pipe sizes of which size and smaller does the nominal size roughly refer to nominal inside diameter?
A. 8 inches
B. 10 inches
C. 14 inches
D. 12 inches
Correct Answer: D
Explanation: For NPS 12 and smaller, the nominal pipe size is loosely related to inside diameter, not actual outside diameter.
Q9. The undertolerance of welded pipe often used in refinery service may be approximately:
A. 0.010 inch
B. 0.125 inch
C. 0.250 inch
D. 0.500 inch
Correct Answer: A
Explanation: Welded pipe may have smaller dimensional undertolerances than wrought pipe, depending on specification.
Q10. Cast iron piping is normally used for:
A. High-pressure hydrocarbon service
B. Non-hazardous service such as water
C. Hydrogen service
D. High-temperature refinery process service
Correct Answer: B
Explanation: Cast iron is brittle and is generally restricted to non-hazardous services such as water.
Q11. Tubing is generally seamless drawn, but it may also be welded. Its stated size is its actual:
A. Inside radius
B. Inside diameter
C. Outside diameter
D. Outside radius
Correct Answer: C
Explanation: Tubing is designated by actual outside diameter, unlike pipe, which is designated by nominal pipe size.
Q12. Which of the following is not a normal valve type?
A. Gate valve
B. Globe valve
C. Check valve
D. Style valve
Correct Answer: D
Explanation: Gate, globe, and check valves are standard valve types. “Style valve” is not a standard valve classification.
Q13. Which type of valve is normally used in a fully open or fully closed position?
A. Gate valve
B. Globe valve
C. Needle valve
D. Diaphragm valve
Correct Answer: A
Explanation: Gate valves are designed primarily for isolation, not throttling.
Q14. Which type of gate valve has body and port openings smaller than the valve end openings?
A. Full-port gate valve
B. Reduced-port gate valve
C. Globe-pattern gate valve
D. Diaphragm gate valve
Correct Answer: B
Explanation: Reduced-port gate valves have a smaller flow opening than the pipe connection size.
Q15. Which type of gate valve should generally not be used as a block valve associated with pressure relief devices?
A. Full-port gate valve
B. Outside screw and yoke gate valve
C. Reduced-port gate valve
D. Rising-stem gate valve
Correct Answer: C
Explanation: Reduced-port valves may restrict flow and are not suitable where full relief capacity must be maintained.
Q16. A globe valve is commonly used to:
A. Prevent backflow only
B. Throttle or regulate flow
C. Support pipe loads
D. Replace pressure relief valves
Correct Answer: B
Explanation: Globe valves are suitable for throttling because of their internal flow path and seat arrangement.
Q17. A plug valve consists of:
A. A sliding plate moving on rail guides
B. A circular disk moving perpendicular to flow
C. A tapered or cylindrical plug with a port fitting into a matching seat
D. A spring-loaded disk designed only for backflow prevention
Correct Answer: C
Explanation: Plug valves use a rotating tapered or cylindrical plug with an opening through it.
Q18. Which valve depends on a spherical closure member with a hole through it?
A. Globe valve
B. Plug valve
C. Diaphragm valve
D. Ball valve
Correct Answer: D
Explanation: A ball valve uses a rotating ball with a bore to open or shut off flow.
Q19. Check valves are normally used to:
A. Automatically prevent backflow
B. Throttle flow precisely
C. Control pipe vibration
D. Replace expansion joints
Correct Answer: A
Explanation: Check valves allow flow in one direction and close automatically to prevent reverse flow.
Q20. Slide valves are generally used in:
A. Low-temperature cryogenic service only
B. Erosive or high-temperature service
C. Potable water service only
D. Instrument tubing service only
Correct Answer: B
Explanation: Slide valves are commonly used in services where erosive solids or high temperatures may be present.
Q21. Which type of joint would normally not be used in a 300 psi piping system?
A. Weld-neck flanged joint
B. Bell-and-spigot joint
C. Butt-welded joint
D. Lap-joint flanged joint
Correct Answer: B
Explanation: Bell-and-spigot joints are generally not appropriate for higher-pressure process piping systems.
Q22. Which pipe joint is generally limited to non-critical service and nominal pipe size 2 inches or smaller?
A. Butt-welded joint
B. Flanged joint
C. Threaded joint
D. Weld-neck joint
Correct Answer: C
Explanation: Threaded joints are commonly limited to small-bore, non-critical service because threads reduce wall thickness and can leak.
Q23. Socket-welded joints are usually used in nominal pipe sizes of:
A. 2 inches or smaller
B. 4 inches or larger
C. 6 inches or larger
D. 8 inches or larger
Correct Answer: A
Explanation: Socket welds are commonly used for small-bore piping.
Q24. Which joint is most commonly found in petroleum industry process piping?
A. Bell-and-spigot joint
B. Butt-welded joint
C. Compression joint
D. Sleeve joint
Correct Answer: B
Explanation: Butt-welded joints are widely used because they provide strength and leak-tightness.
Q25. The primary purpose of piping inspection is to:
A. Replace piping at fixed intervals
B. Avoid all pressure testing
C. Ensure plant safety, reliability, and quality assurance
D. Eliminate the need for engineering review
Correct Answer: C
Explanation: Inspection supports safe and reliable operation by identifying deterioration before failure.
Q26. Adequate inspection is a prerequisite for maintaining piping:
A. Only in clean service
B. Only during shutdown
C. Only when corrosion is visible
D. In a safe and operable condition
Correct Answer: D
Explanation: Inspection ensures piping remains fit for continued operation.
Q27. OSHA 1910.119 requires that process equipment such as piping be inspected and tested:
A. In accordance with recognised and generally accepted good engineering practice
B. Only when a leak is found
C. Only once before startup
D. Only by the original manufacturer
Correct Answer: A
Explanation: OSHA PSM requires inspection and testing consistent with recognised engineering standards.
Q28. Regulatory requirements usually cover conditions that affect:
A. Production only
B. Safety
C. Paint color
D. Operator preference
Correct Answer: B
Explanation: Regulations mainly focus on safety, environmental protection, and public risk.
Q29. The most frequent reason for replacing piping is:
A. Vibration
B. Graphitization
C. Thinning due to corrosion
D. Paint failure
Correct Answer: C
Explanation: Corrosion-related wall thinning is one of the most common causes for piping replacement.
Q30. For operating piping, the key to effective corrosion monitoring is establishing:
A. CUI zones only
B. Relief valve settings
C. Pipe support spacing
D. Thickness monitoring locations
Correct Answer: D
Explanation: TMLs allow repeatable thickness readings and corrosion-rate monitoring.
Q31. Problems can occur when tightening flange bolts to correct in-service leaks. Which of the following is not a separate additional problem if all listed issues are already valid concerns?
A. None of the above
B. Bolt interaction
C. Flange deflection
D. Yielding due to overload
Correct Answer: A
Explanation: Bolt interaction, flange deflection, and yielding from overload are all possible concerns.
Q32. Which of the following is not normally a major factor when establishing corrosion-monitoring programs?
A. Circuitization
B. Transducer diameter
C. Accessibility
D. Risk classification
Correct Answer: B
Explanation: Transducer diameter may affect measurement technique but is not a primary program-level factor.
Q33. A greater loss of metal thickness near restrictions or changes in direction is usually caused by:
A. Soil resistivity
B. External weathering only
C. Turbulence or velocity effects
D. Paint discolouration
Correct Answer: C
Explanation: Turbulence and increased velocity can accelerate erosion-corrosion.
Q34. In catalyst, flue-gas, and slurry piping on an FCC unit, the most likely deterioration mechanism is:
A. Chloride cracking
B. Graphitization
C. Hydrogen blistering
D. Erosion
Correct Answer: D
Explanation: Catalyst and slurry streams can contain abrasive solids that cause erosion.
Q35. Type 304 stainless steel exposed above about 100°F may crack in the presence of:
A. Chlorides
B. Nitrogen
C. Carbon dioxide
D. Methane
Correct Answer: A
Explanation: Austenitic stainless steels are susceptible to chloride stress corrosion cracking.
Q36. A 2-inch injection line introduces product into an 8-inch pipe. What deterioration is most likely near the injection point?
A. Graphitization
B. Accelerated corrosion or erosion
C. Brittle fracture
D. Creep only
Correct Answer: B
Explanation: Injection points can create local mixing, turbulence, and concentration effects.
Q37. Isolated corrosion near welds of piping shoes is often caused by:
A. Incorrect flange rating
B. Excessive pipe schedule
C. Shoes acting as cooling fins and creating localised temperature differences
D. Incorrect valve orientation
Correct Answer: C
Explanation: Local temperature differences can promote condensation or localised corrosion.
Q38. Piping containing amine is especially susceptible to:
A. Galvanic corrosion only
B. Creep damage
C. Graphitization
D. Stress corrosion cracking
Correct Answer: D
Explanation: Amine systems can cause environmental cracking, especially in stressed or hard weld areas.
Q39. Which location is usually of highest concern during piping inspection?
A. At and downstream of a chemical injection point
B. Straight pipe containing clean lube oil
C. New painted pipe in non-corrosive service
D. Dry external surfaces at ambient temperature
Correct Answer: A
Explanation: Injection points are vulnerable to localised corrosion, turbulence, and concentration effects.
Q40. Leaks in utility piping such as water and steam are:
A. Always negligible
B. Seldom hazardous but can still cause losses
C. Never worth reporting
D. Only cosmetic issues
Correct Answer: B
Explanation: Utility leaks may be less hazardous than hydrocarbon leaks but can still cause injury, damage, and losses.
Q41. Many piping leaks occur at:
A. Straight pipe runs
B. Pipe wall mid-sections only
C. Flanges or packing glands
D. Pipe nameplates
Correct Answer: C
Explanation: Joints, gaskets, and packing glands are common leak points.
Q42. Prompt repair of what condition can prevent serious corrosion or erosion of gasket surfaces or packing glands?
A. Supports
B. Guides
C. Leaks
D. Paint fading
Correct Answer: C
Explanation: Leaks can erode or corrode sealing surfaces if not corrected.
Q43. Vessel wall deformation near pipe attachments, malfunctioning expansion joints, or pipe dislodgement from supports may indicate:
A. Misalignment
B. Correct flexibility
C. Proper support loading
D. Normal operation
Correct Answer: A
Explanation: These symptoms suggest piping movement, stress, or alignment problems.
Q44. Spring hanger loading should be checked under:
A. Cold conditions only
B. Both cold and hot conditions
C. Hydrotest conditions only
D. Painting conditions only
Correct Answer: B
Explanation: Spring hangers must function properly in both shutdown and operating conditions.
Q45. If concrete fireproofing around a structural steel column has cracks and water may be entering, the inspector should:
A. Take no action
B. Paint over the cracks
C. Remove enough fireproofing to determine the extent of the problem
D. Replace the entire rack immediately
Correct Answer: C
Explanation: Enough fireproofing should be removed to assess corrosion and damage.
Q46. If a steel column in a pipe support rack is corroded, the inspector should:
A. Ignore it if the rack is still standing
B. Only repaint it
C. Wait until the next turnaround
D. Take thickness measurements to determine remaining load capacity
Correct Answer: D
Explanation: Structural adequacy must be confirmed before deciding on repair.
Q47. Loose or broken foundation bolts can be checked non-destructively by:
A. Lightly rapping the bolts sideways while holding a finger against the opposite side
B. Breaking all concrete around the bolts
C. Cutting the bolts for inspection
D. Radiographing the full foundation
Correct Answer: A
Explanation: A loose bolt can often be detected by sound and movement using light hammer tapping.
Q48. A slotted hole in a base plate may indicate that the base plate was designed to:
A. Hide fabrication errors
B. Accommodate expansion
C. Reduce bolt strength
D. Allow leakage detection
Correct Answer: B
Explanation: Slotted holes can permit controlled thermal movement.
Q49. If a 6-inch piping line is vibrating and swaying, one important inspection action is to check:
A. Valve paint condition only
B. Nameplate readability
C. Welds for cracks, especially at restraint points
D. Insulation thickness only
Correct Answer: C
Explanation: Vibration can cause fatigue cracking, especially at restraints and attachments.
Q50. If insulated pipe jacketing has defects and water ingress is suspected, the inspector should:
A. Ignore it unless the pipe is leaking
B. Strip all insulation immediately
C. Replace the pipe without inspection
D. Remove enough insulation to determine corrosion extent and severity
Correct Answer: D
Explanation: Local insulation removal allows confirmation of corrosion under insulation without unnecessary full stripping.
Q51. A discoloured spot on an underground pipeline right-of-way near a road crossing should be:
A. Investigated as a possible spill, with samples checked as needed
B. Ignored if it is not wet
C. Covered with soil
D. Marked for review several years later
Correct Answer: A
Explanation: Discolouration may indicate leakage or contamination and should be investigated.
Q52. An increase in pump pressure accompanied by decreased downstream flow indicates possible:
A. Pipe rupture
B. Fouling
C. Correct operation
D. Low suction pressure only
Correct Answer: B
Explanation: Fouling or blockage can increase resistance, raising pump discharge pressure while reducing flow.
Q53. A UT transducer without high-temperature delay-line material can be damaged by temperatures over approximately:
A. 1000°F
B. 500°F
C. 150°F
D. 50°F
Correct Answer: C
Explanation: Standard UT probes can be damaged by hot surfaces; high-temperature probes or delay lines are required.
Q54. When taking UT readings on piping operating above about 200°F, the readings may be:
A. Completely unaffected
B. Exactly 10 percent low
C. Exactly 15 percent high
D. About 1 to 5 percent high depending on temperature
Correct Answer: D
Explanation: Temperature affects sound velocity and can cause indicated thickness errors unless corrected.
Q55. If insulated piping wall thickness must be checked without cutting insulation or shutting down, which method may be used?
A. Radiographic testing
B. Magnetic particle testing
C. Liquid penetrant testing
D. Visual testing only
Correct Answer: A
Explanation: RT can sometimes be used to estimate wall condition without removing insulation.
Q56. Reduced metal strength, scaling, bulging, metal deterioration, or failure are symptoms of:
A. Excessive temperature
B. Low pressure
C. Minor vibration
D. Normal service
Correct Answer: A
Explanation: Overheating can cause oxidation, scaling, creep, deformation, and loss of strength.
Q57. Probable external corrosion locations on underground piping may be found by measuring:
A. Pipe paint thickness
B. Pipe hardness only
C. Soil electrical resistance or pipe-to-soil potential
D. Valve stem travel
Correct Answer: C
Explanation: Soil resistivity and pipe-to-soil potential surveys help locate corrosion risk areas.
Q58. Before going into the field for inspection, one important action is to:
A. Replace all gaskets
B. Pressure test the entire unit
C. Remove insulation randomly
D. Review previous and current inspection records
Correct Answer: D
Explanation: Past inspection data helps identify known damage mechanisms, TMLs, and priority areas.
Q59. During visual internal inspection, if fouling is found, the inspector should:
A. Consider cleaning and evaluate deposits to determine their origin
B. Ignore it unless the operator complains
C. Replace the pipe immediately
D. Paint the internal surface
Correct Answer: A
Explanation: Deposits may indicate corrosion, contamination, or process issues and should be evaluated.
Q60. The piping locations most susceptible to cracking are generally:
A. Straight pipe only
B. Welds
C. Pipe labels
D. Painted surfaces
Correct Answer: B
Explanation: Welds and heat-affected zones often have residual stress and metallurgical changes.
Q61. When checking austenitic materials for cracks using PT, penetrants should have:
A. High chlorides
B. Medium sulfur
C. Low or no chlorides
D. High nitrides
Correct Answer: C
Explanation: Chlorides can damage austenitic stainless steels and promote stress corrosion cracking.
Q62. In the groove of a ring-joint flange made from ASTM 347 stainless steel, the likely defect of concern is:
A. Fouling
B. Pits only
C. Hydrogen blisters
D. Cracks
Correct Answer: D
Explanation: Stainless steel ring grooves can be susceptible to cracking, especially under stress and corrosive conditions.
Q63. Valve body thickness should be measured at previously inaccessible locations, particularly:
A. Locations showing evidence of corrosion or erosion
B. Only the handwheel
C. Only the paint surface
D. Random external markings
Correct Answer: A
Explanation: Areas with visual evidence of attack should receive targeted thickness checks.
Q64. Valve bodies operating in severe cyclic temperature service should be checked internally for:
A. Fouling only
B. Cracks
C. Paint failure
D. Nameplate damage
Correct Answer: B
Explanation: Thermal cycling can cause fatigue cracking.
Q65. Gate valves should be measured for thickness between the seats because serious deterioration may occur due to:
A. Overpainting
B. Incorrect handle size
C. Corrosion
D. Thread galling only
Correct Answer: C
Explanation: The area between seats can trap corrosive fluids and experience localised attack.
Q66. The area between the seats of a gate valve is a weak location because:
A. It is always externally insulated
B. It is normally unpressurized
C. It has no contact with fluid
D. The body is thinner in this location
Correct Answer: D
Explanation: Reduced section thickness makes this area more vulnerable to loss of wall.
Q67. After a valve has been inspected, repaired, and reassembled, it should be:
A. Tested to API 598 requirements
B. Installed without testing
C. Painted internally only
D. Stored uncapped outdoors
Correct Answer: A
Explanation: Repaired valves should be tested to verify leak-tightness and pressure integrity.
Q68. In addition to checking flange gasket surfaces for defects, corrosion, and erosion, the inspector should verify:
A. Paint brand and coating colour
B. Bolt specification, stretching/corrosion, and proper gasket type/material
C. Operator preference for gasket style
D. Whether the flanges are from the same vendor only
Correct Answer: B
Explanation: Proper bolting and gasket selection are critical for joint integrity.
Q69. For a carbon steel weld in amine service, the inspector should also check:
A. Flange paint condition
B. Pipe support spacing only
C. Weld hardness because amine service can cause environmental cracking
D. Valve handwheel direction only
Correct Answer: C
Explanation: Hard welds in amine service may be susceptible to stress corrosion cracking.
Q70. Carbon steel and carbon-molybdenum steel welds exposed to elevated temperatures of about 800°F or higher may be subject to:
A. Chloride pitting
B. Oxygen grooving
C. Cavitation only
D. Graphitization
Correct Answer: D
Explanation: Long-term exposure to high temperature can cause graphitisation in susceptible steels.
Q71. Which of the following is not a cause of threaded joint leakage?
A. Use of proper lubricant
B. Cross-threading
C. Loose threads
D. Dirty threads during assembly
Correct Answer: A
Explanation: Proper lubricant helps assembly and sealing; improper assembly conditions cause leaks.
Q72. A leaking threaded joint should not be tightened while in service under pressure because:
A. The pipe schedule will increase
B. The valve will close automatically
C. An undetected crack in a thread root may fail and release product
D. The gasket rating will increase
Correct Answer: C
Explanation: Thread roots are stress concentrators and may fail suddenly when disturbed under pressure.
Q73. Which type of pipe joint must not be used without adequate axial restraint?
A. Threaded joint
B. Flanged joint
C. Welded joint
D. Clamped joint
Correct Answer: D
Explanation: Clamped joints may separate under pressure thrust unless axially restrained.
Q74. Which of the following is not a typical cause of piping misalignment?
A. Broken anchors or guides
B. Excessive friction on sliding supports
C. Too many flange bolts or wrong bolt material
D. Improperly adjusted hangers
Correct Answer: C
Explanation: Bolt count or material may affect joint integrity but is not a typical cause of system misalignment.
Q75. Where excessive vibration or swaying is noted, inspection should check for points of:
A. Abrasion and external wear
B. Graphitisation and graphitic corrosion
C. Internal oxidation only
D. Soil corrosion only
Correct Answer: A
Explanation: Movement can cause rubbing, external wear, and fatigue cracking.
Q76. Piping exposed to 800°F or above should be checked for creep or deformation by:
A. Hammer testing only
B. Using a transit to establish alignment, elevation, or plumbness
C. Painting the pipe
D. Performing only a gasket inspection
Correct Answer: B
Explanation: Creep can produce measurable deformation, sagging, or misalignment over time.
Q77. One method for checking the condition and thickness of small nipples, vents, and bleeders is:
A. PT
B. MT
C. RT
D. Visual inspection only
Correct Answer: C
Explanation: Radiography can help evaluate small-bore connections where UT access is difficult.
Q78. A pressure test for piping is, in most cases, primarily a:
A. Metallurgical test
B. Fatigue test
C. Hardness test
D. Leak test
Correct Answer: D
Explanation: Most piping pressure tests verify leak-tightness after fabrication, repair, or alteration.
Q79. Any system being pressure tested must be completely isolated to:
A. Prevent test medium from entering connected lines
B. Increase corrosion rate
C. Reduce documentation
D. Avoid using calibrated gauges
Correct Answer: A
Explanation: Isolation prevents unintended pressurisation or contamination of connected systems.
Q80. If air is used for testing or trapped during hydrotesting, a failure will be:
A. Less violent than liquid-only failure
B. More violent due to expansion of compressible gas
C. Impossible to detect
D. Always harmless
Correct Answer: B
Explanation: Compressed gases store significant energy and can release violently during failure.
Q81. Which material should not commonly be used as a pressure-test medium?
A. Water with suitable additives
B. Inert gas
C. Hydrogen sulfide, gasoline, liquid propane, or similar hazardous fluids
D. Normal non-toxic process liquid when safe
Correct Answer: C
Explanation: Toxic, flammable, or highly hazardous fluids are generally unsuitable for pressure testing.
Q82. Water may be a questionable test medium for:
A. Diesel fuel systems
B. Acid lines, cryogenic systems, and air-drier systems
C. Kerosene systems
D. Boiler feedwater systems
Correct Answer: B
Explanation: Water can cause corrosion, freezing, contamination, or operating problems in these services.
Q83. When testing carbon steel piping in cold weather or with cold fluids, the inspector should consider:
A. Paint drying time only
B. Pump horsepower only
C. Transition temperature to avoid brittle fracture
D. Valve color coding only
Correct Answer: C
Explanation: Carbon steel can fail brittlely below its transition temperature.
Q84. The preferred medium for a pneumatic test is:
A. Propane
B. Hydrogen
C. Flammable gas
D. An inert gas
Correct Answer: D
Explanation: Inert gases reduce fire and reaction hazards during pneumatic testing.
Q85. Which piping commonly has a pressure recorder attached to create a permanent pressure-test record?
A. Underground piping
B. Small utility tubing only
C. Temporary hose only
D. Instrument air tubing only
Correct Answer: A
Explanation: Underground piping tests often require permanent records because later access is limited.
Q86. Which piping should not be hammer tested?
A. Carbon steel pipe in non-critical service
B. Cast iron and stress-relieved lines in caustic or corrosive service
C. New A106 pipe in normal service
D. Painted aboveground utility pipe
Correct Answer: B
Explanation: Brittle materials and stress-relieved or cracking-sensitive services can be damaged by hammer testing.
Q87. New construction piping should meet, as a minimum, the requirements of:
A. API 571
B. ASTM A53 only
C. ASME B31.3
D. API 598 only
Correct Answer: C
Explanation: ASME B31.3 is the primary process piping construction code.
Q88. When ASME B31.3 cannot be directly followed because it is written for new construction, which document should guide the engineer/inspector for in-service piping?
A. API 570
B. API 575
C. ASME Section VIII only
D. API 598
Correct Answer: A
Explanation: API 570 governs inspection, repair, alteration, and rerating of in-service piping systems.
Q89. A piping engineer must be:
A. An API 570 inspector only
B. Acceptable to the owner-user
C. The original piping designer only
D. A single individual only
Correct Answer: B
Explanation: API 570 recognises a piping engineer as one acceptable to the owner-user and knowledgeable in piping systems.
Q90. Which of the following is not normally considered a rerating?
A. Derating due to corrosion
B. Increasing the MAWP of the system
C. Changing to a lower allowable-stress material
D. Installing a scab patch as a repair without changing design conditions
Correct Answer: D
Explanation: A repair patch is a repair activity; rerating involves changing design pressure, temperature, or allowable conditions.
Q91. A piping system does not include which of the following as a system component?
A. Valves
B. Fittings
C. Dents
D. Flanges
Correct Answer: C
Explanation: Dents are damage or deformation, not piping system components.
Q92. The boundary of a piping circuit should be sized:
A. To minimise all inspection work
B. To eliminate the need for TMLs
C. To avoid documentation
D. To provide accurate record-keeping and field inspection
Correct Answer: D
Explanation: Proper circuitization supports inspection planning, records, and corrosion monitoring.
Q93. When using statistical methods to assess corrosion in piping, it is very important to:
A. Properly select components and ensure an adequate number of TMLs
B. Hydrotest all piping before analysis
C. Avoid using corrosion data
D. Eliminate all inspection circuits
Correct Answer: A
Explanation: Statistical corrosion assessment depends on representative component selection and enough valid thickness data.