SOP for Cleaning of AHU filters

This Document describes (Standard Operating procedure) SOP for Cleaning of AHU filters

Sop for Cleaning of AHU filters.

I. Purpose & Scope:

• The Purpose of this SOP is to lay down the procedure for Cleaning of AHU filters.
• This procedure is applicable to all Engineering Department for Cleaning of AHU filters.

II. Responsibilities:

• All Engineering personnel’s shall be responsible to follow and implement this SOP.

III : Introduction and Procedural Part :

Precautions while cleaning of AHU filters :

Ensure three phase power supply should be switched off from panel. Prefilters, Micro v filter, fresh Air filter shall be numbered as follows:

EN/AHUPPPP/XXzz

Where,

EN – Engineering

AHU – Air Handling Unit

PPP- Sequence number of AHU

XX-“PF” for Prefilter

zz- sequence no of prefilter/micro V filter / fresh air filter

AHU filters i.e. HEPA filters, Riser filter shall be numbered as follows :

ZA/BB/AHUPPP/K/MM.

Where,

AK – Company Name

BB : Department code

AHU – Air Handling Unit

PPP – Sequence number of AHU

K – filter type (HEPA: H, Riser: R)

MM- sequence no of HEPA filter, riser filter

Differential pressure monitoring of AHU filters i.e. pre filters and micro-V filters.

• Check and daily monitoring of the differential pressure reading at the Magnehelic gauge, which are provided across the pre filter and micro-V filter of all AHU’s.
• Record the pressure differential at the start of the day of AHU for prefilters & Micro-V filters.

The limits of the pressure differential as follows for Pre-filters are as follows. ( General facility )

• Operational range of magnehelic gauge is 0 to 10 mmWC.
• Operation limit is 1 to 6 mm WC
• Alert limit is above 7 mm WC
• Action Limit is above 8 mm WC.

The limits of the pressure differential as follows for Micro-V filters are as follows (General Facility).

• Operational range of magnehelic gauge is 0 to 25 mmWC.
• Operation limit is 2 to 10 mmWC
• Alert limit is above 11 mmWC
• Action Limit is above 12 mm WC.

The limits of the pressure differential as follows for Prefilters are as follows. ( Injection Facility )

• Operational range of magnehelic gauge is 0 to 10 mm WC.
• Operation limit is 3 to 10 mmWC
• Alert limit is above 9 mmWC
• Action Limit is above 10 mm WC.

The limits of the pressure differential as follows for Micro-V filters are as follows. (Injection Facility).

• Operational range of magnehelic gauge is 0 to 25 mm WC.
• Operation limit is 6 to 20 mmWC.
• Alert limit is above 15 mmWC.
• Action Limit is above 20 mm WC

Pre Filter / Micro-v Filters cleaning:

• Engineering and Utility Department shall intimate to concern department.
• Concern Department will confirm the availability of Equipment as per intimated schedule.
• Switch off the air handling unit and allow the blower to come to rest.
• Wear nose mask and hand gloves.
• Put the Status label ‘DO NOT OPERATE.
• Open the filter plenum door by unlocking the door handle.
• Take the filters out by unscrewing all the fasteners and then close the filter plenum door.
• Take the filters to the filter cleaning room in polythene bags and keep them in the dirty filter staging area.
• Clean the filter according to the following procedures. Place the filter in reverse position on SS pallet.
• Wear nose mask and hand gloves and take out the filter from polythene bag.
  First clean the filter with compressed air.
• Dip the filter in the potable water and wash with potable water 2 times and finally Rinse with the purified water.
• Then blow compressed air on the filter for drying.
• Keep the dried filter in polythene bag.
• After completion of filter cleaning then attach clean status label & kept vertically.
• After cleaning of all filters take the same to respective AHU. Re-fix them at their respective position by tightening all the fasteners. Close the filter door after fixing the filters.
• Record the filter cleaning details in the Annexure I

Frequency for cleaning of pre/micro-V filters (Injection Facility):

• Fresh air filters, Pre-filters & Micro-V filters cleaning shall be weekly and as when required for General Block.

Frequency for cleaning of pre/micro-V filters (Injection Facility):

• Fresh air filters, Pre-filters & Micro-V filters cleaning shall be Monthly and as when required for Injection Block.
• The replacement of HEPA filters shall be after every five year or In case of HEPA found damaged, same shall be replaced with raising deviation.

Risers Filter Cleaning :

• Switch off the air handling/ventilation unit.
• Wear nose mask and hand gloves.
• Open the riser door and remove the filter from filter plenum.
• Take the filters to the filter cleaning room in polythene bags and keep them in the dirty filter staging area.
• Place the filter in reverse position on SS pallet.
• Wear nose mask and hand gloves and take out the filter from polythene bag.
• First clean the filter with compressed air.
• Dip the filter in the potable water and wash with potable water 2 times and finally rinse with the purified water.
• Then blow compressed air on the filter for drying.
• Visual checking of riser filters shall be done in front of lamp. After cleaning for leakage.
• Keep the dried filter in polythene bag.
• After completion of filter cleaning then attach clean status label & kept vertically.
• After cleaning of all filters take same to respective area in polythene bag and re fix them properly.
• Check the leakage from the risers, if found any leakage fill the silicon sealant.
• Riser filters shall be cleaned at time of product change over as per requested by user through intimation slip as per Annexure II
• Record the filter cleaning details in Annexure III

Frequency for cleaning of Riser filter (General Facility):

Riser filters shall be cleaned weekly and as when required for General facility.

Frequency for cleaning of Riser filter (Injection Facility):

Riser filters shall be cleaned monthly and as when required for Injection Facility.

 

Annexure I : Log Book for Cleaning of AHU/FDV Filters

Annexure-II : Pressure Monitoring record of pre filter & Micro-V filter (General facility)

Annexure-III : Pressure Monitoring record of pre filter & Micro-V filter (Injection Facility ).

Annexure-IV: Specimen copy of filter cleaning status board

 

Annexure –I

Log book for cleaning of AHU Filters/FDV filters. 

Department:    ____________________________   Month/Year: _____________________________      

AHU / FDV ID No. : ______________________ Area : ____________________________________

 

Sr. No.

Date

Fresh Air Filters 20 µ

Pre Filters 10 µ

Micro-V Filter 5µ

Riser Filter 20 µ

Cleaned By

Checked By

Remarks

ID No.: EN/AHU-

Status

ID No.: EN/AHU-

Status

ID No.: EN/AHU-

Status

ID No.: EN/AHU-

Status

 

 

Reviewed By (Department Head – Sign./Date):                                                                                                                                Verified By (QA Sign./Date):

 

Annexure-II

Magnehelic pressure gauge reading of AHU prefilter and Micro-V filter (General Facility)

Date: ____________________________    Area: __________________________________

 

Sr. No.	AHU No.	Prefilter Magnehelic gauge  ID	Actual Reading of prefilters (mmWC)	Micro-V filter Magnehelic gauge ID	Actual Reading of Micro-V filters (mmWC)	Done By	Remarks
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

(Limit of ∆P of Prefilters of AHU: 1 to 6 mmWC

(Alert limit: >7 mmWC, Action Limit :> 8 mm WC)

(Limit of ∆P of Micro-V filters of AHU: 2 to 10 mmWC

(Alert limit: > 11mmWC, Action Limit :> 12mm WC)

 

Annexure-III

Magnehelic pressure gauge reading of AHU prefilter and Micro-V filter (Injection Facility)

 

Date: ____________________________        Area: _________________________________

 

Sr. No.	AHU No.	Prefilter Magnehelic gauge  ID	Actual Reading of prefilters (mmWC)	Micro-V filter Magnehelic gauge ID	Actual Reading of Micro-V filters (mmWC)	Done By	Remarks
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

 

(Limit of ∆P of Prefilters of AHU: 3 to 10 mmWC

(Alert limit: >9 mmWC, Action Limit :> 10 mm WC)

(Limit of ∆P of Micro-V filters of AHU: 6 to 20 mmWC

(Alert limit: >15 mm WC, Action Limit :> 20 mm WC)

 

ANNEXURE – IV

Filter cleaning status Board for AHU filters

AHU No./ FDV No. : ____________

 

PREFILTER	ID NO.	FILTER CLEANED ON	FILTER CLEANING DUE ON	SIGN / DATE
20 MICRON               ( Fresh air )
10 MICRON              ( Prefilter)
5 MICRON ( Micro V )
20 MICRON ( Riser Filters)