API 510 Pressure Testing 2

Question 1

According to API 510, what is the minimum hold time for a pneumatic pressure test on a pressure vessel?

Accepted Answer

10 minutes

Answer

API 510 requires a minimum hold time of 10 minutes for pneumatic pressure tests before conducting the inspection.

Question 2

When performing a hydrostatic test, the test pressure at the top of the vessel must account for which of the following?

Accepted Answer

Liquid head pressure

Answer

The liquid head pressure must be considered when setting test pressure, as the pressure at the top differs from the pressure at the bottom due to fluid column height.

Question 3

Which condition would require the owner/user to obtain approval before performing a pressure test after a repair?

Accepted Answer

Major repairs involving welding on pressure boundary

Answer

Major repairs involving welding on the pressure boundary require an authorized inspection agency to approve the pressure test per API 510.

Question 4

A vessel has an MAWP of 500 psi. The standard hydrostatic test pressure per ASME Code is approximately:

Accepted Answer

650 psi

Answer

ASME requires hydrostatic test pressure to be 1.3 times the MAWP, so 500 × 1.3 = 650 psi.

Question 5

What is the primary reason pneumatic testing is considered more hazardous than hydrostatic testing?

Accepted Answer

Compressed gas stores significantly more energy than liquid at the same pressure

Answer

Compressed gases store far more energy than incompressible liquids at the same pressure, resulting in a much more violent potential failure.

(API 510) API 510 Inspector Certification Practice Test

(API 510) API 510 Inspector Certification Practice Test

API 510 Pressure Testing 2