API 510 Welding Inspection 5

Question 1

Under API 510, a 'hot tap' welding procedure on an in-service pressure vessel requires special consideration primarily because:

Accepted Answer

Welding is performed on equipment containing fluid under pressure and temperature, requiring special heat input controls to prevent burn-through

Answer

Hot tap welding on in-service equipment requires strict heat input controls and procedure qualification to prevent burn-through of the pressurized, potentially fluid-filled shell.

Question 2

When reviewing radiographs of a pressure vessel longitudinal seam weld, the inspector identifies elongated dark linear indications aligned with the weld axis. This most likely represents:

Accepted Answer

Slag inclusions or incomplete fusion

Answer

Elongated linear indications aligned with the weld axis in radiographs are characteristic of slag inclusions or incomplete fusion, both of which are rejectable planar discontinuities.

Question 3

Per API 510 and ASME Section IX, a welder's performance qualification (WPQ) expires if the welder has not welded using the qualified process for a period exceeding:

Accepted Answer

6 months

Answer

Per ASME Section IX QW-322, a welder's qualification expires if they have not used the qualified process within any 6-month period.

Question 4

An inspector notices that a weld repair on a pressure vessel shell was made with heat input significantly higher than qualified in the WPS. The primary concern with excessive heat input in carbon steel is:

Accepted Answer

Grain growth in the HAZ leading to reduced toughness and potential cracking susceptibility

Answer

Excessive heat input causes grain growth in the heat-affected zone, which reduces toughness and increases susceptibility to brittle fracture, particularly at low temperatures.

Question 5

Per API 510, who is responsible for verifying that welders performing repair work on a pressure vessel are currently qualified for the applicable WPS?

Accepted Answer

The repair organization and the Authorized Pressure Vessel Inspector

Answer

Both the repair organization (who must maintain welder records) and the Authorized Pressure Vessel Inspector share responsibility for verifying current welder qualifications.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Welding Inspection 5