API 653 Repair and Alteration 2

Question 1

According to API 653, which organization must authorize a repair organization to perform repairs on aboveground storage tanks?

Accepted Answer

The tank owner/operator

Answer

API 653 requires the tank owner/operator to authorize repair organizations and ensure repairs meet the standard's requirements.

Question 2

When welding a flush-type cleanout fitting to a tank shell as a repair, what is the minimum shell plate thickness that must be maintained after the repair?

Accepted Answer

The minimum thickness required for the design conditions per API 653

Answer

API 653 requires that after any repair, the resulting wall thickness must meet the minimum thickness required for the current design conditions.

Question 3

A tank shell plate shows a horizontal crack. Per API 653, what is the preferred repair method?

Accepted Answer

Removing the cracked plate section and installing a flush patch

Answer

API 653 recommends removing cracked material entirely and replacing with a flush patch rather than attempting crack repairs that may not address root cause.

Question 4

What is the minimum overlap distance for a lap-welded shell repair patch per API 653?

Accepted Answer

2 inches

Answer

API 653 requires a minimum overlap of 2 inches (50 mm) for lap-welded repair patches on tank shells.

Question 5

Under API 653, an alteration to a storage tank that increases the maximum fill height requires which of the following?

Accepted Answer

A re-rating calculation and engineer approval

Answer

Increasing fill height is an alteration that requires engineering calculations to verify structural and design adequacy under API 653.

(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 2