API 653 Code Requirements 3

Question 1

According to API 653, what is the maximum interval between internal inspections for a tank in normal service when the corrosion rate is unknown?

Accepted Answer

10 years

Answer

When the corrosion rate is unknown, API 653 limits the internal inspection interval to a maximum of 10 years.

Question 2

Per API 653, what is the maximum interval for external inspections of aboveground storage tanks?

Accepted Answer

5 years

Answer

API 653 requires external inspections at intervals not exceeding 5 years for tanks in normal service.

Question 3

Which of the following qualifications must an API 653 tank inspector possess according to the standard?

Accepted Answer

A current API 653 certification or equivalent documented experience

Answer

API 653 requires that inspectors hold a current API 653 certification or meet the standard's equivalent experience and education requirements.

Question 4

When API 653 requires ultrasonic thickness (UT) measurements on a tank shell, what is the minimum number of readings required at each course?

Accepted Answer

Readings must be taken at defined grid patterns per the standard

Answer

API 653 specifies that UT measurements must follow defined patterns or grids to adequately characterize the corrosion profile of each shell course.

Question 5

Under API 653, what condition requires immediate removal from service or repair before continued operation?

Accepted Answer

Shell thickness below the calculated minimum allowable shell thickness (MAST)

Answer

When measured shell thickness falls below the minimum allowable shell thickness (MAST), the tank must be removed from service or repaired before continued operation.

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

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

API 653 Code Requirements 3