HEPA FILTER INTEGRITY TEST


HEPA FILTER INTEGRITY TEST
Objective:
This test is undertaken to verity each set of HEPA filters Integrity.
Acceptance Criteria:
Acceptance filter leakage shall be defined as permitting not more than 0.01% particle penetration of the up stream concentration.
Test Equipments:
1.     Aerosol Generator.
2.     Aerosol photometer.
Procedure:
1.     Switch ON the Air Handling unit.
2.     Ensure that the aerosol photometer is having a valid calibration certificate with threshold sensitivity below 10 microgram per litre for 0.3µ particles. The aerosol photometer should have a sampling rate of 28.3±3% L/min.(1 CFM).
3.     Add DOP(Dioctyl phthalate) or DEHS(Di-2- Ethyl hexyl sebacate) or PAO(Poly Alpha Olefin) or DOS(Dioctyl sepacate) or Paraffin oil or suitable aerosol material recommended by the supplier to the aerosol generator.
4.     Keep the aerosol generator near the return air grill/diffuser/fresh air damper of the AHU.
5.     Provide compressed air or nitrogen to the aerosol generator at the pressure between 10 to 20 PSI(equivalent to 2.0 Kg/cm²) and visually confirm the generation of aerosol.
6.     Switch ON the Aerosol photometer and turn the photometer selector switch on upstream mode and connect the tube of the photometer to upstream port of HEPA plenum.
7.     Wait until photometer displays upstream concentration of 100%. Set the upstream concentration between 20 to 80µg/Lit of air.
8.     Remove the tube of photometer and tightly close the upstream port of HEPA housing.
9.     Once the 100% concentration is established at the upstream side, turn the instrument knob to downstream.
10.  Photometer selector switch set to down stream and then photometer probe should scan the entire filter face and frame at a position of about 5cm from the face of the filter and should be traversed slowly(at a scan rate of not exceeding 5cm/sec for square probe and about 15cm²/sec. for rectangular probe), using slightly overlapping strokes, as shown below(step 2).
11.  The entire downstream face of each HEPA filter, the perimeter of each filter and the seal between the filter frames shall be scanned once, as shown below(Step 1 & 2).
12.   Measure the down stream concentration/observe the % of leakage directly on photometer and record in the raw data sheet.

HEPA FILTER MOUNTING

For clarity step1 and step 2
Step 1: Scanning of perimeter of HEPA filter & joint between the filter frame and housing.
Step 2: Scanning of HEPA filter media using slightly overlapping strokes.


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