API 570 Piping Inspector Practice Questions — 10 Free (2026)

Which document must be reviewed by the inspector to ensure the welder has undergone the proper testing to perform a specific production weld?

• A. WPS
• B. PQR
• C. WPQ ✓
• D. MTR
• E. NDE Report

The Welder Performance Qualification (WPQ) is reviewed to ensure that the individual welder has been properly tested and is qualified to perform work according to a specific WPS. API 577, 9.2.1.1

Because the phenomena involved are irreversible, de-embrittlement does not apply to which degradation type?

• A. Temper embrittlement
• B. Hydrogen embrittlement
• C. Hydrogen attack ✓
• D. Both A and B
• E. None of the above

Hydrogen attack and creep embrittlement involve irreversible damage, making de-embrittlement ineffective. ASME_PCC2, Table 215-4.5-1

Consistent with the API inspection approach referenced by API 574, the next thickness inspection interval is set as the lesser of the maximum period or:

• A. The full remaining life
• B. One-half the remaining life ✓
• C. One-quarter the remaining life
• D. Twice the remaining life
• E. Three-quarters the remaining life

Thickness intervals are typically the lesser of the code maximum or one-half the remaining life; API 574 defers the interval rules to API 570. API RP 574 (defers intervals to API 570)

T-741.2 sets what requirement when the surface contrast enhancement used is nonmagnetic?

• A. Thickness must be measured
• B. It must be removed before testing and the surface re-cleaned
• C. It must be demonstrated that indications can be detected ✓
• D. It must be applied with a brush
• E. It must be fluorescent

When using contrast enhancement, it must be demonstrated that indications are still detectable through it. ASME Section V T-741.2

In condensate systems, ammonia (with oxygen) specifically tends to attack:

• A. Carbon steel far more than any copper alloy under typical refinery operating conditions
• B. Only austenitic stainless steel
• C. Only titanium components in the system
• D. Copper-based alloys such as admiralty brass ✓
• E. Only aluminum ducting downstream

Ammonia (with oxygen) preferentially attacks copper alloys (e.g., admiralty brass) in condensers/condensate systems. The other statements are incorrect. API 571, Boiler Water and Steam Condensate Corrosion

What is considered an essential variable requiring requalification?

• A. Change in welding process ✓
• B. Change in filler metal diameter
• C. Change in groove angle
• D. Change in backing composition
• E. Change in preheat temperature

Switching the welding process is treated as an essential variable, so the procedure must be requalified. ASME IX, QW‑401

Review Exhibit WPS-PQR-05. Considering the thickness of the PQR test coupon, what maximum base metal thickness does the qualification actually support, and is the range stated on the WPS acceptable?

• A. 0.75 in. maximum
• B. 8.000 in. maximum
• C. 1.5 in. maximum ✓
• D. 3 in. maximum
• E. 0.998 in. maximum

The coupon is 0.75 in., so the maximum base metal thickness qualified is 1.5 in. The WPS claims 3 in., which the PQR does not support, so the range is not acceptable as written. Both ends of a stated range must be checked independently; the lower end is correct here. ASME BPVC Section IX, Table QW-451.1

A pipe in A106 Grade B with an outside diameter of 3.5 in. (88.9 mm) is designed for 1100 psig at 500 deg F. The longitudinal weld joint quality factor is 1, W = 1.0 and Y = 0.4. What is the pressure design thickness for internal pressure?

• A. 0.111 in. (2.83 mm)
• B. 0.088 in. (2.22 mm)
• C. 0.102 in. (2.59 mm)
• D. 0.1 in. (2.53 mm) ✓
• E. 0.2 in. (2.53 mm)

A106 Grade B gives 18,900 psi at 500 deg F. Applying t = PD/(2(SEW + PY)) gives 0.1 in. (2.53 mm). Dropping the PY term from the denominator is the most frequent error, and taking E as 1.0 when the pipe is welded credits a seamless product that was not supplied. ASME B31.3, 304.1.2, Appendix A and Table A-1C

A buried line runs through soil measured at 1,500 ohm-cm. What is the recommended maximum interval for alternate pressure test with effective cathodic protection?

• A. 10 years
• B. 2.5 years
• C. 7.5 years
• D. 15 years
• E. 5 years ✓

Table 4 is entered on soil resistivity. For this band the alternate pressure test with effective cathodic protection interval is 5 years. The three interval columns in each row differ, so selecting the wrong column is the standard error; the unprotected pressure test interval is always half the protected one. API 570, Table 4

As per ASME PCC-2, a repair is being designed on a component with a nominal wall thickness of 0.437 in. (11.1 mm). What is the minimum recommended thickness of a Type A sleeve?

• A. 0.328 in. (8.32 mm)
• B. 0.437 in. (11.1 mm)
• C. 0.291 in. (7.4 mm) ✓
• D. 0.218 in. (5.55 mm)
• E. 0.874 in. (22.2 mm)

Two-thirds of the carrier pipe thickness is the minimum for a Type A sleeve. Its ends receive no circumferential weld to the carrier pipe, so it reinforces the defect without being able to hold pressure. That works out to 0.291 in. (7.4 mm) here. ASME PCC-2, 206-3.1