API 653 Repair and Alteration 5

Question 1

API 653 requires that repair documentation be retained for at least how long?

Accepted Answer

The life of the tank

Answer

API 653 requires that all repair and alteration records be maintained for the remaining life of the tank to support future inspection and fitness-for-service evaluations.

Question 2

When repairing a tank shell using a lap patch, what type of weld is required around the full perimeter of the patch per API 653?

Accepted Answer

Continuous fillet weld

Answer

API 653 requires a continuous fillet weld around the entire perimeter of a lap patch to prevent crevice corrosion and ensure structural continuity.

Question 3

A tank inspector finds that a previous shell repair used an incorrect filler metal. Under API 653, what action should be taken?

Accepted Answer

Perform a fitness-for-service assessment to determine if the repair is acceptable

Answer

API 653 supports a fitness-for-service approach to evaluate whether a non-conforming repair provides adequate structural integrity for continued service.

Question 4

What is the minimum preheat temperature required per API 653 when welding on a carbon steel tank shell with a plate thickness greater than 1 inch?

Accepted Answer

200°F (93°C)

Answer

API 653 references ASME Section VIII / API 650 preheat requirements, which typically require 200°F (93°C) minimum preheat for carbon steel plates exceeding 1 inch thickness.

Question 5

Per API 653, when repairing a tank annular plate, what is the minimum length of a replacement annular plate insert?

Accepted Answer

24 inches (600 mm)

Answer

API 653 requires annular plate replacements to be at least 24 inches (600 mm) long to ensure adequate weld joint quality and structural continuity.

(API 653) API 653 Aboveground Storage Tank Inspector Certification Practice Test

(API 653) API 653 Aboveground Storage Tank Inspector Certification Practice Test

API 653 Repair and Alteration 5