Helium Filter Leak Testing

Bubble Tight Helium Leakage Test

The filter being tested is connected to a gaseous helium supply. The filter is then submerged under water and the helium supply pressure is raised. A typical test is performed at 25%, 50%, 75%, and 100% of the maximum allowable working pressure (MAWP). At each interval, NFC observes the filter being tested for bubbles which would represent a leak (1-minute duration). This test station has a booster pump that allows us to test up to 25,000 PSI maximum.
Leakage Detection Level: 1x10-4 cc/s - pass/fail - non-numeric result
Governing Procedure: OPMF-62

Bubble Tight Leakage Test 

Precision Helium Leak Detection Test

The filter being tested is placed inside the vacuum chamber and connected to a feedthrough line that is then connected to a helium bottle (2k or 6k). The chamber door is closed and the chamber is brought to vaccum pressures. The filter being tested is then pressurized to a desired operating pressure based on customer requirements. A helium leak detector that is also connected to the chamber then reads out a numeric leakage value that is compared to a requirement to determine pass/fail status. 
Leakage Detection Level: 1x10-9 cc/s - numeric result
Governing Procedure: OPMF-130

Helium Leak Detector and Chamber

Testing Specifications

  • Test Pressure: 0 - 22,500 PSI maximum
  • Duration: 1 minute at each of 25%, 50%, 75%, 100% MAWP (typical)
  • Procedure: OPMF-62 and OPMF-130 - Pneumatic Proof Pressure & Bubble Tight Leak Set-Up and Test (typical)

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