API 653 Repair and Alteration 4

Question 1

What does API 653 classify as an 'alteration' as opposed to a 'repair' for aboveground storage tanks?

Accepted Answer

A change in tank design, configuration, or service that was not part of the original design

Answer

API 653 defines alterations as physical changes or service condition changes outside the original design intent, distinguishing them from like-for-like restorations.

Question 2

When performing a repair using a flush patch on a tank shell, what is the minimum distance the patch edges must be kept from existing shell welds per API 653?

Accepted Answer

3 inches (75 mm)

Answer

API 653 requires flush patch edges to be at least 3 inches (75 mm) from existing welds to avoid creating intersecting or closely spaced weld joints.

Question 3

According to API 653, who is responsible for ensuring that all tank repairs and alterations conform to the standard's requirements?

Accepted Answer

The tank owner/operator

Answer

API 653 places ultimate responsibility for compliance with the standard's repair and alteration requirements on the tank owner/operator.

Question 4

A repair organization plans to use a new welding procedure for tank shell repairs. Per API 653, the procedure must be:

Accepted Answer

Qualified in accordance with ASME Section IX

Answer

API 653 requires that welding procedures be qualified per ASME Section IX, which is the standard reference for welding procedure qualification in pressure equipment.

Question 5

When API 653 allows an 'in-service' repair (repair made while the tank contains product), what is a key prerequisite?

Accepted Answer

Engineering evaluation must confirm structural and safety adequacy for the in-service condition

Answer

API 653 permits in-service repairs only after engineering evaluation confirms that the repair can be safely performed with product present.

(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 4