API 570 Piping Inspector Practice Exam

API 570 Piping Inspector Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a piping inspection program?
• To increase production efficiency
• To ensure the mechanical integrity and safety of piping systems
• To reduce material costs
• To supervise welding activities

Rationale: The primary objective of piping inspection is to maintain

mechanical integrity and prevent failures that could compromise safety.

• Which code is primarily used for the inspection, repair, alteration, and

rerating of in-service piping systems?

A. ASME B31.1

B. ASME B31.3

C. API 570 1 / 4

D. AWS D1.1

Rationale: API 570 specifically addresses inspection, repair,

alteration, and rerating of in-service piping.

• What is the minimum inspection interval for a high-pressure, high-

temperature (HPHT) piping system without known damage mechanisms?

• 1 year
• 2 years
• 3 years
• 5 years

Rationale: API 570 allows a maximum interval of 5 years for piping

without known damage mechanisms.

• Which NDE method is most suitable for detecting surface cracks in

carbon steel piping?

• Radiographic Testing (RT)
• Magnetic Particle Testing (MT)
• Ultrasonic Testing (UT)
• Hydrostatic Testing

Rationale: MT is highly effective for detecting surface and slightly

subsurface cracks in ferromagnetic materials.

5. The term “corrosion allowance” refers to:

• Extra thickness added for future modifications
• Additional wall thickness added during fabrication to account for 2 / 4

expected corrosion over the service life

• Reduced wall thickness for flexibility
• Maximum operating pressure margin

Rationale: Corrosion allowance compensates for material loss due to

corrosion, ensuring safe service life.

• Which type of piping is most susceptible to under-deposit corrosion?
• Stainless steel
• Carbon steel handling water or slurries
• Copper

D. PVC

Rationale: Carbon steel in aqueous environments with deposits is

highly susceptible to localized under-deposit corrosion.

• Which parameter is critical when performing a thickness

measurement using ultrasonic testing?

• Surface condition and couplant application
• Ambient air temperature
• Pipe color
• Operator clothing

Rationale: Surface condition and proper couplant ensure accurate UT

measurements.

• What is the primary purpose of a hydrostatic test?
• Detecting external corrosion
• Verifying the mechanical strength of the piping system under 3 / 4

pressure

• Measuring wall thickness
• Inspecting weld quality visually

Rationale: Hydrostatic testing ensures the system can safely

withstand operating pressures.

• In API 570, what is the significance of a “piping class”?
• Indicates the diameter only
• Defines design conditions, materials, pressure, and temperature

limits

• Represents inspection frequency
• Identifies inspection methods

Rationale: Piping class sets design and material requirements for

safe operation.

• What type of damage is most common in steam lines?
• General corrosion
• Stress corrosion cracking
• Erosion
• Galvanic corrosion

Rationale: High-temperature steam can lead to stress corrosion

cracking, especially in carbon and low-alloy steels.

• Which component is considered a “pressure-retaining” item?
• Support bracket
• Valve body
• / 4