API 510 Pressure Testing 5

Question 1

Per API 510, when can a pressure test be omitted following an alteration?

Accepted Answer

When the authorized inspector agrees and a thorough NDE examination is performed as an alternative

Answer

The authorized inspector may waive pressure testing after an alteration if thorough NDE is performed and the inspector is satisfied with the results.

Question 2

What is the purpose of slowly increasing pressure in stages during a pneumatic test?

Accepted Answer

To allow for leak detection at lower pressures before reaching full test pressure

Answer

Staged pressure increases allow inspectors to detect and address leaks at lower, safer pressures before applying full test pressure.

Question 3

Which type of NDE method is most commonly substituted as an alternative to a pressure test in API 510?

Accepted Answer

Radiographic testing (RT) or ultrasonic testing (UT) of completed welds

Answer

Radiographic or ultrasonic testing of completed weld joints is the most common alternative NDE method accepted in lieu of pressure testing.

Question 4

A vessel is being repressurized after repair. If the MAWP has been reduced as a result of the repair, the pressure test should be based on:

Accepted Answer

The new reduced MAWP

Answer

The pressure test must be based on the new, reduced MAWP to reflect the actual current capability of the repaired vessel.

Question 5

Which personnel safety precaution is critical during the pressurization phase of a pneumatic test?

Accepted Answer

Personnel should be cleared from the area or behind barriers during pressurization to full test pressure

Answer

Personnel should be evacuated or positioned behind barriers during pneumatic pressurization due to the explosive energy released if the vessel fails.

(API 510) API 510 Inspector Certification Practice Test