API 653 Pressure Testing 2

Question 1

According to API 653, what is the minimum hold time for a hydrostatic test on a reconstructed tank before inspection begins?

Accepted Answer

1 hour

Answer

API 653 requires the hydrostatic test pressure to be held for at least 1 hour before the inspection of the shell and bottom is performed.

Question 2

When performing a hydrostatic test on an aboveground storage tank, the test water temperature should be maintained above what minimum to prevent brittle fracture?

Accepted Answer

40°F (4°C)

Answer

API 653 requires that the hydrostatic test water temperature be maintained above 40°F (4°C) to avoid brittle fracture of the shell material.

Question 3

Which API 653 alternative to a full hydrostatic test requires the tank bottom to be inspected using a sensitive leak detection method such as vacuum box or magnetic flux leakage?

Accepted Answer

Inspection in lieu of hydrostatic test

Answer

API 653 Section 12 allows an inspection in lieu of hydrostatic testing when the bottom is examined by an acceptable leak detection method.

Question 4

During a hydrostatic test of a repaired tank, where should settlement measurements be taken and recorded?

Accepted Answer

At equally spaced points around the tank periphery

Answer

API 653 requires settlement measurements to be taken at equally spaced points around the tank periphery to detect differential settlement during filling.

Question 5

What action must be taken if a leak is discovered in the shell during a hydrostatic test under API 653?

Accepted Answer

Immediately reduce water level and repair before retesting

Answer

Any shell leak found during hydrostatic testing requires immediate depressurization to a safe level, repair of the defect, and a retest.

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

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

API 653 Pressure Testing 2