API 510 Repair and Alteration Standards

Question 1

What must be obtained before making repairs to a pressure vessel under API 510?

Accepted Answer

Authorization from the inspector and a detailed repair plan

Answer

API 510 requires inspector authorization and a documented repair plan before any work begins on a pressure vessel.

Question 2

What distinguishes a repair from an alteration under API 510?

Accepted Answer

A repair restores to original condition while an alteration changes design conditions

Answer

A repair restores a vessel to its original design condition, while an alteration changes design parameters like pressure, temperature, or dimensions.

Question 3

Which welding code governs pressure vessel repairs?

Accepted Answer

ASME Section IX

Answer

ASME Section IX governs welding and brazing qualifications for pressure vessel and piping repairs and construction.

Question 4

What documentation is required after completing a pressure vessel repair?

Accepted Answer

Complete repair records including materials, procedures, and test results

Answer

Complete documentation including materials used, procedures followed, welder qualifications, and test results creates a permanent repair record.

Question 5

When must post-weld heat treatment (PWHT) be performed after a repair?

Accepted Answer

When required by the original code of construction or when specified by the inspector

Answer

PWHT is required when the original code of construction specifies it or when the inspector determines it is necessary for the repair.

(API 510) Certified Pressure Vessel Inspector Practice Test