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HEPA Filter Integrity Test, Filter leakage Test, PAO Test in HVAC

HEPA Filter Integrity Test/PAO Test


Hepa Filter Integrity Test:-

HEPA filter used in pharmaceutical industry in manufacturing area. HEPA stands for high efficiency particulate air.This HEPA filters are installed in Air Handling Unit as plenum HEPA or in process area as Terminal HEPA, as per HVAC design condition or requirement.This filter are not cleanable by air or water. Then how we can check the filter condition, for this HEPA Filter Integrity test is done.

This test carried out by outside HEPA filters integrity check agency or as per in-house test procedure.

For hepa filters integrity test shall be carried out by calibrated photometer which have accuracy with the national standard. 

Common Oils used for this purpose:-
1) Poly-Alpha olifin Emery 3004 or nurasyn 162
2)Dioctyle sebacate
3)Di-2-ethyle hexyle sebacate
4)Dioctyle phthalate 
5)Paraffin oil

Test Procedure:

Objective: To check the installation integrity of the HEPA Filter installed in Air Handling Units.
For HEPA filters leakages should not have 0.01% concentration. 
 
Pre-Requisite: Filter testing shall be performed only after operational air velocities have been verified and adjusted wherever necessary.
 
Test Method:Position the Aerosol generator and introduce Aerosol into the upstream air, ahead of the HEPA filters. Check the upstream concentration of PAO solution through the upstream concentration port, the concentration of PAO should between 80 to 120 mg/liter of air at the filter’s designed air flow rating and set the instrument at 100% concentration. Scan the entire face of the filter for leaks using probe, probe should be held approximately 3cm or 1 inch from filter face during scanning using slightly overlapping strokes and also area scan rate should not exceed 5cm/sec or 1 inch/sec (for scanning probe size 3cm × 3cm).

Scanning should be performed over the entire downstream face of the filter, perimeter of each filter, the seal between the filter frame and the grid structure, including its joints.

HEPA Filter leakage should exceed the limit of 0.01% of leakages.

 


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