HEPA Filter Integrity test | How do we do that?

Rahul Kashyap
3


HEPA Filter Integrity test
Image Source

HEPA Filter Integrity test:

  • The HEPA filter integrity test shall be performed by qualified and trained person only.
  • Measuring and testing instrument being used shall be calibrated with reference to NPL/NABL traceable reference standard.
  • Filter integrity testing shall be performed after operational velocities have been verified and adjusted where necessary.
  • Poly alpha olefin (PAO) shall be used for the generation of particles/ fumes. (Ref: ISO 14644 Part III) MSDS of the same shall be provided by the external agency.
  • Position the aerosol generator such that aerosol is produced into the upstream of the subjected HEPA filter.
  • Provide compressed air to the fume generator at pressure of 1.5-2 kg/cm2 for HEPA Filter Integrity test process.
  • The concentration of the aerosol challenge upstream of the filter should be between 20 mg/m³ and 80 mg/m³.
  • A concentration lower than 20 mg/m³ can reduce the sensitivity of leak detection. A concentration greater than 80 mg/m³ can give rise to excessive filter fouling over the extended test period.
  • Scan the upstream concentration and set photometer 100% for HEPA Filter Integrity test process.
  • Scanning should be performed over the entire downstream face of each filter, the perimeter of each filter, the seal between the filter frame and the grid structure, including its joints at the distance of approximately 3 cm from the downstream filter face or the frame structure.
  • The probe traverse scan rate when using 3 cm x 3 cm square probe should not exceed 5 cm/s with a rectangular probe, the maximum area scan rate should not exceed 15cm²/s.
  • While scanning, any indication of leak equal to or greater than the limit which characterizes a designated leak should be cause for holding the probe at the leak location. The location of the leak should be identified by the position of the probe that sustains the maximum reading on the photometer.
  • Measurement of the aerosol upstream of the filters should be repeated at reasonable time intervals between and after scanning for leaks, to confirm the stability of the challenge aerosol concentration.
  • Acceptance Criteria: The penetration of the HEPA filter should not be more than rated efficiency of the filter i.e. 0.01%. (ISO 14644-1 & WHO TRS 961)



Post a Comment

3Comments
  1. The information you've provided is useful because it provides a wealth of knowledge about Local Roof Repair Contractors Canberra that will be highly beneficial to me. Thank you for sharing that. Keep up the good work.

    ReplyDelete
  2. Excellent post. I really enjoy reading and also appreciate your work. This concept is a good way to enhance knowledge. Keep sharing this kind of articles, Thank you.Roseburg Roofing Roseburg Oregon

    ReplyDelete
  3. Laminate flooring is a highly versatile flooring option that can be used in many different settings. It's a great choice for homes and businesses that need a floor that is easy to clean and is resistant to wear and tear. Laminate Flooring Nashville

    ReplyDelete
Post a Comment