API 510 Welding Inspection 3

Question 1

Per API 510, who has the authority to approve a welding repair procedure for a pressure vessel?

Accepted Answer

The Authorized Pressure Vessel Inspector

Answer

The Authorized Pressure Vessel Inspector (API 510 Inspector) has the authority to approve repair procedures for pressure vessels.

Question 2

What NDE method is most appropriate for volumetric examination of a completed groove weld in a pressure vessel shell plate?

Accepted Answer

Radiographic Testing (RT) or Ultrasonic Testing (UT)

Answer

RT and UT are volumetric methods capable of detecting internal discontinuities such as porosity, slag, and lack of fusion within the weld volume.

Question 3

When a welder is qualified for a particular base metal P-Number group under ASME IX, that qualification generally covers welding of:

Accepted Answer

All P-Numbers within the same group and certain other P-Numbers per ASME IX rules

Answer

ASME Section IX qualification for a P-Number group covers all materials within that group and extends to other groups as specifically permitted by the code.

Question 4

An API 510 inspector finds porosity clustered at the weld stop/start location. The most likely root cause is:

Accepted Answer

Contamination or improper arc restart technique

Answer

Clustered porosity at weld start/stop locations is typically caused by contamination, moisture, or improper arc restart technique that traps gas in the solidifying weld pool.

Question 5

For a pressure vessel weld repair involving a P-No. 1 carbon steel material with a wall thickness of 1.5 inches, what preheat temperature is typically required per ASME Section I/VIII and referenced by API 510?

Accepted Answer

150°F (65°C) minimum

Answer

For P-No. 1 carbon steel above 1 inch thickness, ASME typically requires a minimum preheat of 150°F (65°C) to prevent hydrogen cracking.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Welding Inspection 3