What is PRV Seat leakage (tightness) test?

PRV Testing – Seat Tightness Test (Leakage Test); 

Seat Tightness Test or Leakage Test is a leak test between Seat and Disc of Pressure Relief Valves (PRV) which will be done after Pop test by maintaining PRV ‘s Inlet pressure at 90% of Set Pressure and counting bubbles. Caused by air or nitrogen leak through Seat and Disc come out.

PRV seat leakage test.png
The bubles outlet tube size Must be followed Standard, Ex: ID = 6.12mm

PRV Testing – Example of Seat Tightness Test (Leakage Test); 

An example of setting up equipment for the Seat Tightness Test or Leakage Test of Pressure Relief Valves (PRV)

PRV seat leakage test workshop.png

PRV Testing – Acceptance Criteria for Seat Tightness Test (Leakage Test); 

In the Seat Tightness Test or Leakage Test of Pressure Relief Valves (PRV) with air or nitrogen, there is an Acceptance Criteria in accordance with API 527 : the rate of air leakage through Disc and Seat by counting the bubbles that occur in one minute (Bubbles per minute), which must have zero leakage rate for Soft Seat and not exceed the value specified in the table for Metal Seat which will be divided by Set Pressure and Orifice Diameter.

PRV seat leakage test standard buble counting.png
API 527: leakage rate for valve test.

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