Technical regulations for leak testing of pressure relief valves according to the API 527 standard
This standard defines unified procedures for verifying the tightness of the seat in pressure relief valves equipped with both metal and resilient (soft) seals. The provisions of the document apply to valves of standard, bellows, and pilot configurations. EV Group China specialists recommend using these regulations to ensure industrial safety at oil, gas, and energy facilities.
Standards for maximum allowable leakage rates are applicable to pressure relief valves with operating pressures ranging from 103 kPa (15 psi) to 41,379 kPa (6000 psi). In cases where the technological process requires a higher tightness class, the customer is obliged to include the corresponding requirements in the specification when placing an order with EV Group China.
The selection of the test medium (air, steam, or technical water) must strictly correspond to the medium used when setting the valve’s set pressure. For valves operating with two media, the primary operating fluid of the system is selected as the test medium.
Only qualified personnel with deep competence in the operation and maintenance of pressure relief devices are permitted to perform testing procedures.
Safety recommendations: When performing leak testing, the observer is required to use mirrors or other indirect viewing aids. It is strictly forbidden to stand directly in front of the valve discharge nozzle to avoid injury in case of accidental activation of the device under pressure.