API 510 Pressure Testing Procedures 4

Question 1

During pressure testing, the pressure should be increased gradually. Per API 510 guidance, the rate of pressurization should be controlled primarily to prevent what hazard?

Accepted Answer

Dynamic pressure surge or water hammer that could cause structural damage

Answer

Gradual pressurization prevents dynamic surge loading or water hammer effects that could cause damage even below the design test pressure.

Question 2

What does API 510 require regarding pressure relief devices during a hydrostatic or pneumatic pressure test?

Accepted Answer

Pressure relief devices should be removed or gagged so they do not open at test pressure

Answer

Relief devices are typically removed or gagged during testing so they do not open prematurely, since test pressure exceeds normal operating and set pressures.

Question 3

After a repair that does not penetrate the pressure boundary, such as a surface weld repair that restores wall thickness, is a pressure test typically required per API 510?

Accepted Answer

Not necessarily; the inspector may waive the test using NDE methods as an alternative

Answer

API 510 allows inspectors to waive the pressure test for minor repairs not penetrating the pressure boundary when satisfactory NDE is performed instead.

Question 4

A pressure vessel located in a cold climate is to be hydrostatic tested in winter. The main concern with using cold water for the test is:

Accepted Answer

Risk of brittle fracture in the vessel metal if the temperature is below the MDMT

Answer

Testing at temperatures below the vessel's MDMT increases the risk of brittle fracture, even at test pressures below the design limit.

Question 5

Per API 510, who has the authority to approve the use of a pneumatic test in lieu of a hydrostatic test?

Accepted Answer

The owner/user's authorized pressure vessel inspector or an authorized inspection agency

Answer

The owner/user's authorized inspector, often in consultation with an engineer, must approve the substitution of a pneumatic test for a hydrostatic test.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Pressure Testing Procedures 4