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OBJECTIVE
To lay down a procedure for Cleaning of Air Handling Unit (AHU) filters 20 Micron, 10 Micron , 5 Micron
SCOPE
This SOP is applicable to cleaning of Air Handling Unit (AHU) filters 20 Micron , 10 Micron, 5 Micron .
RESPONSIBILITY
Technical Supervisor / Engineer
ACCOUNTABILITY
Manager
PROCEDURE
Precautions
Stop the Air Handling Unit and isolate power supply.
Check the number of filters to be cleaned with respect to size, mesh and number.
Handle the filters carefully . Follow the correct sequence of removing and fixing the filters before and after cleaning. First remove the 20 micron and proceed towards 5 micron. Repeat the sequence while fixing
Don’t damage the filter medium, filter casing and tubular spacers
Handle filters with care while bringing back to Air Handling Unit.
Close the AHU service door after removing the filters for cleaning
Pre start Up
Check and note pressure drop across filter banks with help of Magnahelic gauge or data logger as applicable
Position the filters on the chamber window of the filter cleaning equipment
Tap the filter gently by hand / on floor with up stream (dirty) side facing down to floor to dislodge all loose particles.
Operation
Ensure filters cleaning room is cleaned and the filters checking equipment is in operation.
Ensure that compressed air pressure is regulated between 1.0 to 1.5 Kg/cm2 .
Take out the filters as per numbering in sequential manner by starting from 20 micron.
Ensure the service door is positioned back and closed after removing the filters for cleaning
Ensure the dust collector blower is switched on and in operation.
Ensure the compressed air Pressure is set to 1.0 to 1.5 Kg/cm2
Direct the compressed air over the filters surface with an angle from one end to another corner on the total surface
Ensure the filters is cleaned thoroughly by visual inspection
Remove the filters from the cleaning chamber and check its cleanliness by means of measuring the pressure difference on he filter checking equipment as per SOP.
Keep the filter in the plastic cover and shift to the AHU area
Place the filters properly in Air Handling Unit with as per numbering and in the reverse sequence of removal
Tighten all the bolts of the filters.
Tighten all the bolts of plenum doors
Close the service door.
Switch on the main and start the AHU
Check pressure difference across filters with the help of Magnehelic gauge/data
Logger as applicable
Check and note the conditions inside the rooms.
Document the details of cleaning in the machine history card
During product to product change over
Whenever the Pressure drop across the filters exceeds 6 mm of WC
During the Preventive Maintenance schedules completion
Forms and Records (Annexures)
Not Applicable
Distribution
Master copy – Quality Assurance
Controlled copies- Quality Assurance, Production, Quality Control
History
Date
Revision Number
Reason for Revision
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00
New SOP
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