-Filter
integrity test is performed to confirm that the final high efficiency
air filter is property installed or not .In this test verified the absence of
bypass leakage in the installation ,and that the filter are free fro of defects
(small holes and other damages in the filter medium and frame work.)
-These tests
do not check the efficiency of the system.
- The test is performed by using aerosol
photometer.
-The tests are performed by introducing an
aerosol challenge upstream of the filters and scanning downstream of the
filters and support frame or sampling in a downstream duct.
-An aerosol shall
be generated by blowing compressed air
through aerosol generator at room
temperature.
-Set the
compressed air supply pressure to aerosol generator at 20 psi minimum.
Make sure that
detector is functioning properly by exposing the probe of PAO and wait for
alarm.
-Inject the
aerosol of PAO in the air stream ahead of pre filter.
-Inject the
aerosol at the upstream of the HEPA filter, to produce uniform challenge of PAO in upstream
of HEPA filter.
-Hold the detector approximately 6 inches
downstream of filter under test and scan for any leakage.
-Scan the
complete area of the filter under test at traverse rate of 10 FPM.
-Detect the
leakage in form of the beep (alarm) produced due to PAO sensing during the
test.
- At the end of the test ensure that
Photometer is working properly by exposing it to PAO smoke.
-Record the
observations in the respective formats
-Acceptance criteria:
Not more than 0.01% penetration of
PAO.
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