Pressure Testing Procedures Flashcards
7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Pressure Testing Procedures flashcards as text
According to API 510, what is the minimum hold time for a hydrostatic pressure test on a pressure vessel before inspection begins?
Answer: 10 minutes
API 510 requires the test pressure to be held for at least 10 minutes before inspection commences.
When performing a pneumatic pressure test, the initial pressure should be raised to what level before pausing to check for leaks?
Answer: 25% of test pressure
Pneumatic tests require an initial hold at approximately 25% of test pressure to allow a preliminary leak check before proceeding.
Which condition would require a pressure vessel to undergo a retest after repairs?
Answer: Replacement of a corroded nozzle
Repairs involving pressure-boundary components such as nozzles typically require a pressure retest per API 510.
What is the primary reason water is preferred over air or gas for hydrostatic testing?
Answer: Water is nearly incompressible, releasing little energy if a failure occurs
Water's incompressibility means minimal stored energy, making a failure during hydrostatic testing far less dangerous than pneumatic testing.
Per API 510, when hydrostatic testing is not practical, which alternative test may be used with documented justification?
Answer: Pneumatic test
A pneumatic test may substitute for a hydrostatic test when hydrostatic testing is impractical, provided additional safety precautions are taken.
During a hydrostatic test, the test pressure gauge should be located at what position relative to the vessel?
Answer: At the highest point of the vessel
Placing the gauge at the highest point of the vessel ensures accurate measurement by accounting for the hydrostatic head of liquid below.
A vessel fails a hydrostatic test when the pressure cannot be maintained. Before concluding a structural failure, what should be checked first?
Answer: All valves, fittings, and connections for external leaks
Pressure loss during a hydrostatic test is often due to leaking valves or fittings rather than a structural failure of the vessel itself.