Filter Cleaning of HVAC System RLAF & LAF

1.0 Objective
To lay down a procedure for Filters Cleaning of HVAC System, RLAF & LAF.
2.0 Scope
This Standard Operating Procedure is applicable for various types of Filters (Fresh Air, Primary & secondary) fitted in HVAC System, RLAF & LAF to be followed at formulation plants
3.0 Responsibility
3.1 Engineering Officer / Executive shall be responsible for the execution of this procedure.
3.2 Engineering Manager shall be responsible for the implementation of this SOP.
3.3 Head QA/Designee should be responsible for compliance of this SOP.
4.0 Abbreviations and Definitions
SOP : Standard Operating Procedure
No : Number
QC : Quality Control
Qty : Quantity
TAC : Tablet and Capsule
DPI : Dry Powder Injection
L&L : Liquid and Lozenges
MB : Microbiology
APU : Air Processing Unit
5.0 Procedure
5.1 Frequency: The cleaning frequency of filter is as follows:
S.No. DESCRIPTION FREQUENCY

1 Pre-Filters and Fresh air Filters of AHUs Catering to all Process area of TAC , L&L and DPI Block Fortnightly
2 MV Filter of AHUs Catering to all Process area of TAC , L&L and DPI Block Fortnightly
3 APU Filters of All Fluid Bed Driers And, All Coating Machines Fortnightly
4 Filter Cleaning of Reverse Laminar Air Flow for dispensing and sampling booth Fortnightly
5 Filter Cleaning of Laminar Air Flow Monthly
5.2 Cleaning of AHU filters:
5.2.1 Ensure that no production activities are being carried out in respective area for which filter cleaning is scheduled.
5.2.2 Clean the filters if the differential pressure across the filter exceed beyond the specified limit or as per the scheduled whichever is earlier.
5.2.3 Switch off the AHU and isolate the power supply.
5.2.4 Put “FILTER CLEANING UNDER PROGRESS “Tag on the Panel.
5.2.5 Personnel protective equipments like nose mask, safety goggles and rubber hand gloves shall be used.
5.2.6 Open the door of respective AHU and take out the filters from AHU and pack in polythene bag with label as “To be cleaned”.
5.2.7 Clean the plenum with dry cloth thoroughly and ensure that there is no dust accumulation in the plenum joint panels.
5.2.8 Carry all the filters to a filter cleaning Station.
5.2.9 Remove the filters from polythene bags and place the entire filter at the filter cleaning station for cleaning Purpose. Discard the used polythene bags.
5.2.10 Place the filters from the top on to the filter support frame with dirty side facing downward.
5.2.11 Clean the filters with compressed air with a pressure between 0.5 -1.0 Kg/cm².
5.2.12 Check the filters visually if found dirty then clean the filter with water with the help of water gun.
5.2.13 Dry the filter by blowing compressed air in the direction to that of normal air flow direction.
5.2.14 Check & ensure the filter is cleaned & look for the damages visually.
5.2.15 During inspection of filters if found any discrepancy, take new filter from stores ensure that size of filter is identical with the damaged one. Ensure visually the cleanliness of the new filter.
5.2.16 After cleaning & air drying put the cleaned filters in clean polythene bags and re-fix the filters.
5.2.17 After re-fixing the filters run the AHU and take the differential pressure reading across the filter for confirming the proper cleaning and integrity of the filters.
5.2.18 If differential pressure across the filter found very low then it is confirmed that the filter is damaged then replaced the same and if differential pressure across the filter found very high then it is confirmed then the filters is clogged and replaced the same with new one.
5.2.19 Record the cleanliness of filter as shown in Annexure – 1, 2, 3&4.
5.3 Cleaning Of Process Equipments APU Filters (FBD And Coating )
5.3.1 This procedure is applicable for cleaning the APU filters of All FBDs, and all Coating machines.
5.3.2 Take all the safety precaution prior to cleaning the APU filters of FBD and Coating. Ensure that power supply of these equipments switched off.
5.3.3 Take out the unclean filters from respective APU unit of FBD or Coating.
5.3.4 Repeat the procedure as mentioned in 5.2.7 to 5.2.17.
5.3.5 Record the status of the filter cleaning as shown in Annexure – 1, 2, 3&4.
5.3.6 Filter cleaning can be done with in the period of ± one week under following conditions:
 Non availability of machines/Area
 Holiday
5.4 Cleaning of Reverse Laminar Air Flow.
5.4.1 Ensure that no dispensing / sampling activities are being carried out in respective area for which filter cleaning is scheduled.
5.4.2 Switch off the RLAF and isolate the power supply.
5.4.3 Put “FILTER CLEANING UNDER PROGRESS “Tag on the Panel.
5.4.4 Personnel protective equipments like nose mask, safety goggles and rubber hand gloves shall be used.
5.4.5 Open the cover of respective RLAF and take out the filters from RLAF and pack in polythene bag with label as “To be cleaned”..
5.4.6 Carry all the filters to a filter cleaning Station.
5.4.7 Remove the filters from polythene bags and place the entire filter at the filter cleaning station for cleaning Purpose. Discard the used polythene bag.
5.4.8 Place the filters from the top on to the filter support frame with dirty side facing downward.
5.4.9 Repeat the procedure as mentioned in 5.2.7 to 5.2.17.
5.4.10 Record the cleanliness of filter as shown in Annexure – 5
5.4.11 Filter cleaning can be done with in the period of ± one week under following conditions:
 Non availability of machines/Area
 Holiday
5.5 Cleaning of Filter of Laminar Air Flow.
5.5.1 Ensure that no activities are being carried out in respective area for which filter cleaning is scheduled.
5.5.2 Switch off the LAF and isolate the power supply.
5.5.3 Put “FILTER CLEANING UNDER PROGRESS “Tag on the Panel.
5.5.4 Personnel protective equipments like nose mask, safety goggles and rubber hand gloves shall be used.
5.5.5 Open the cover of respective LAF and take out the filters from LAF and pack in polythene bag with label as “To be cleaned”..
5.5.6 Carry all the filters to a filter cleaning Station.
5.5.7 Remove the filters from polythene bags and place the entire filter at the filter cleaning station for cleaning Purpose. Discard the used polythene bag.
5.5.8 Place the filters from the top on to the filter support frame with dirty side facing downward.
5.5.9 Repeat the procedure as mentioned in 5.2.7 to 5.2.17.
5.5.10 Record the cleanliness of filter as shown in Annexure – 6
5.5.11 Filter cleaning can be done with in the period of ± one week under following conditions:
Non availability of machines/Area
Holiday

6.0 Forms and Records
6.1 Record of AHU filter cleaning – Annexure -1
6.2 Filter Cleaning schedule of process equipment – Annexure -2
6.3 Record of FBD filter cleaning – Annexure -3
6.4 Record of Auto-Coater filter cleaning – Annexure -4
6.5 Record of RLAF filter cleaning – Annexure -5
6.6 Record of LAF filter cleaning – Annexure -6
7.0 Distribution
7.1 Master copy – Documentation Cell (Quality Assurance)
7.2 Controlled copies – Engineering Department

Filter Cleaning of HVAC System RLAF & LAF

sop for Execution of Preventive Maintenance

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