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Free API570 Practice Questions

10 free, exam-style API 570 Piping Inspector (API570) practice questions with answers and explanations. No signup required. Work through them below, then take the full free API570 practice test to study every exam domain.

Question 1

A piping system carries flammable hydrocarbons at 450 psi and 600°F. Per API 570, this piping is classified as:

  1. Class 1
  2. Class 2
  3. Class 3
  4. Special Class
Show answer & explanation

Correct answer: A - Class 1

Question 2

The piping hydrostatic test factor of 1.5 differs from the vessel hydrostatic test factor of:

  1. 1.5 - they are the same
  2. 1.3 per ASME VIII
  3. 1.1 per ASME VIII
  4. 2.0 per ASME VIII
Show answer & explanation

Correct answer: B - 1.3 per ASME VIII

Question 3

A 6-inch pipe measured 0.280 in. three years ago and now measures 0.262 in. What is the short-term corrosion rate?

  1. 0.004 in./yr
  2. 0.006 in./yr
  3. 0.008 in./yr
  4. 0.010 in./yr
Show answer & explanation

Correct answer: B - 0.006 in./yr

Question 4

A system operates at 300 psi and 650°F with A105 (Group 1.1) flanges. Using ASME B16.5 tables, the Class 150 rating at 650°F is approximately 120 psi. The minimum acceptable flange class is:

  1. Class 150
  2. Class 300
  3. Class 400
  4. Class 600
Show answer & explanation

Correct answer: B - Class 300

Question 5

A welder qualified in the 6G position (pipe, 45° fixed) is qualified for which production positions?

  1. 6G position only
  2. All pipe positions (1G, 2G, 5G, 6G)
  3. All plate and pipe positions
  4. 5G and 6G positions only
Show answer & explanation

Correct answer: C - All plate and pipe positions

Question 6

Which leak testing method per ASME Section V Article 10 is the MOST sensitive?

  1. Bubble test - direct pressure
  2. Bubble test - vacuum box
  3. Halide diode detector test
  4. Mass spectrometer test
Show answer & explanation

Correct answer: D - Mass spectrometer test

Question 7

A Class 2 piping circuit has a remaining life of 14 years. The maximum inspection interval is:

  1. 5 years, based on Class 1 limits
  2. 7 years, based on half the remaining life
  3. 10 years, based on Class 2 maximum
  4. 14 years, the full remaining life
Show answer & explanation

Correct answer: B - 7 years, based on half the remaining life

Question 8

A 2-inch socket-welded connection on a reciprocating compressor discharge line has developed a through-wall crack at the toe of the socket weld. The MOST likely damage mechanism is:

  1. Chloride stress corrosion cracking
  2. Vibration-induced fatigue cracking
  3. Microbiologically influenced corrosion
  4. Galvanic corrosion from mixed metals
Show answer & explanation

Correct answer: B - Vibration-induced fatigue cracking

Question 9

When carbon steel flanges are connected to stainless steel piping in seawater service, the metal that corrodes preferentially is:

  1. The stainless steel, as the more noble metal
  2. The carbon steel, as the more active metal
  3. Neither metal - they are fully compatible
  4. Both metals corrode at the same rate
Show answer & explanation

Correct answer: B - The carbon steel, as the more active metal

Question 10

Before approving a hot tap on in-service piping, the authorized inspector should verify all of the following EXCEPT:

  1. Adequate wall thickness for welding
  2. Proper WPS and qualified welder
  3. Safety procedures and permits
  4. The welder's personal home address
Show answer & explanation

Correct answer: D - The welder's personal home address

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