API 510 Pressure Testing Procedures 3

Question 1

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)?

Accepted Answer

1.3 times MAWP

Answer

API 510 specifies that the hydrostatic test pressure for repairs is typically 1.3 times the MAWP, consistent with the current ASME Code.

Question 2

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?

Accepted Answer

30°F above the minimum design metal temperature (MDMT)

Answer

To avoid brittle fracture, the test temperature should be at least 30°F above the MDMT of the vessel being tested.

Question 3

Which document must be prepared and approved before conducting a pneumatic pressure test on a pressure vessel?

Accepted Answer

A written test procedure reviewed by an inspector or engineer

Answer

Due to the hazards of pneumatic testing, a documented test procedure must be prepared and approved before the test begins.

Question 4

After completing a hydrostatic test, what action must be taken before returning the vessel to service?

Accepted Answer

Vent the vessel to remove all test fluid and ensure it is dry if required by service

Answer

Residual test fluid must be drained and the vessel vented; for certain services such as hydrogen or oxygen, complete dryness is essential.

Question 5

In API 510, a 'sensitive leak test' using pressure is typically performed at what pressure level?

Accepted Answer

A fraction of MAWP, typically around 10% or less

Answer

Sensitive leak tests such as the bubble test method are performed at very low pressures, typically around 10% of MAWP or less.

(API 510) Certified Pressure Vessel Inspector Practice Test

(API 510) Certified Pressure Vessel Inspector Practice Test

API 510 Pressure Testing Procedures 3