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
What is the standard hydrostatic test pressure for a repaired pressure vessel per API 510, expressed as a multiple of the maximum allowable working pressure (MAWP)?
Answer: 1.3 times MAWP
API 510 specifies that the hydrostatic test pressure for repairs is typically 1.3 times the MAWP, consistent with the current ASME Code.
When test fluid temperature is a concern during pneumatic testing, API 510 recommends keeping the test fluid temperature above what value to prevent brittle fracture?
Answer: 30°F above the minimum design metal temperature (MDMT)
To avoid brittle fracture, the test temperature should be at least 30°F above the MDMT of the vessel being tested.
Which document must be prepared and approved before conducting a pneumatic pressure test on a pressure vessel?
Answer: A written test procedure reviewed by an inspector or engineer
Due to the hazards of pneumatic testing, a documented test procedure must be prepared and approved before the test begins.
After completing a hydrostatic test, what action must be taken before returning the vessel to service?
Answer: Vent the vessel to remove all test fluid and ensure it is dry if required by service
Residual test fluid must be drained and the vessel vented; for certain services such as hydrogen or oxygen, complete dryness is essential.
In API 510, a 'sensitive leak test' using pressure is typically performed at what pressure level?
Answer: A fraction of MAWP, typically around 10% or less
Sensitive leak tests such as the bubble test method are performed at very low pressures, typically around 10% of MAWP or less.
When pressure testing a vessel with multiple chambers, how should the test pressure be applied?
Answer: Each chamber should be tested independently at its respective design pressure
Each pressure chamber must be tested independently at its own design test pressure to avoid over-pressuring adjacent chambers.
Which of the following scenarios would make it impractical to perform a hydrostatic test, potentially justifying a pneumatic test?
Answer: The vessel structure cannot support the weight of the test fluid
If the vessel or its supporting structure cannot sustain the added weight of water required for a hydrostatic test, a pneumatic test may be justified.