API 653 Pressure Testing 4

Question 1

Under API 653, what is the maximum allowable test pressure for a pneumatic pressure test on a tank shell expressed relative to the design pressure?

Accepted Answer

1.1 times design pressure

Answer

1.25 times design pressure

Answer

1.5 times design pressure

Answer

Equal to the design pressure only

Question 2

An inspector observes that the roof-to-shell junction is weeping during a hydrostatic fill. According to API 653, what is the correct course of action?

Accepted Answer

Stop filling, de-water, repair the junction weld, and retest

Answer

Mark the location and continue filling to maximum test level

Answer

Apply an external sealant clamp and complete the test

Answer

Reduce fill level to 80% and hold for 24 hours

Question 3

For an API 653 inspection, what type of nozzle attachment weld repair on a shell course would trigger a requirement for a shell hydrostatic test or radiography?

Accepted Answer

Any full penetration groove weld repair on a shell nozzle

Answer

Replacement of a flanged nozzle with identical dimensions

Answer

Application of a reinforcement pad over an existing nozzle

Answer

Cleaning and recoating of a shell nozzle exterior

Question 4

According to API 653, which of the following is an acceptable leak test method for a reconstructed tank annular weld where water flooding of the foundation is a concern?

Accepted Answer

Vacuum box testing of the inside bottom edge weld

Answer

Dye penetrant test only

Answer

Radiographic testing of the annular plate

Answer

Ultrasonic thickness testing of the annular ring

Question 5

When calculating the maximum allowable fill height for an API 653 hydrostatic test, which factor primarily limits how high the tank may be filled?

Accepted Answer

The allowable stress in the lowest shell course

Answer

The yield strength of the roof plates

Answer

The capacity of the fill pump

Answer

The anchor bolt design load

Question 6

API 653 states that settlement readings during a hydrostatic test should be taken at a minimum of how many equally spaced points around the tank circumference?

Accepted Answer

8 points

Answer

4 points

Answer

6 points

Answer

10 points

Question 7

Under API 653, who has the authority to approve a deviation from the standard hydrostatic test procedure for a specific reconstructed tank?

Accepted Answer

The engineer of record in consultation with the owner/operator

Answer

The authorized inspector alone

Answer

The tank owner without additional review

Answer

The local building code official