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Switching Process
In the case of media that have a corrosive effect on the materials of the filter, the changeover must be performed regularly 2-3
times per week.
Ending the operation
The duplex filter filter must be emptied as far as the available pumping possibilities allow (at least to below the strainer support).
1.
Close the inlet and outlet.
2.
When the drain screw and the vent screw are opened slowly at the same time, the housing is drained and vented.
3.
Do not open the housing until it is completely depressurised!
4.
After loosening the closing elements, open the filter cover and check the level.
The duplex filter is now ready for maintenance.
To change the strainer inserts, see chapter 4 "Installation and assembly" → "Mounting the strainer insert".
In the case of prolonged downtimes or if the medium hardens, the filter housing must be completely emptied, the strainer inserts
removed and the housing cleaned with a suitable cleaning agent.
Maintenance and care
As soon as one filter half is dirty, the clean filter half is put into operation by slowly switching the stopcock plug.
1.
Depressurise the filter pot to be cleaned using the venting and draining equipment.
2.
Loosen the cover fasteners using a suitable tool and open the filter.
3.
Drain filter using the drain equipment until the level is at least underneath the strainer support
4.
Pull the strainer insert upwards out of the housing (use lifting gear if necessary).
5.
Clean the strainer insert by blowing out or blasting with compressed air, water or steam.
If necessary, the strainer must be soaked in an appropriate medium and cleaned. Under certain circumstances, optimum
cleaning of the strainer is achieved using ultrasound.
6.
For all types of cleaning, it must be ensured that the filter fabric (if present) is not damaged
7.
Check the sealing elements for possible damage and replace if necessary.
Seal manufacturers often point out that in the case of pressure-tight connections, the seals must be replaced after the connection
has been opened.
In practice, the seals are often used many times. Resulting leaks are not a sign of system malfunction, but normal wear.
Maintenance Schedule
System part
Seals
Housing
basket strainer / ring
strainer
Table 3
Maintenance Schedule
Submissions to the factory / complaints
If the duplex filter is returned to SAB for major repairs or servicing or in the event of a complaint, it must be emptied. In addition, it
must be decontaminated when used with hazardous substances.
The SAB contamination declaration must be completed and enclosed with the delivery; the current version can be requested from
SAB.
6
Service, spare parts and advice
For spare parts, filter accessories and advice, SAB sales personnel and SAB Service are available (see cover page for contact
details).
Availability
SAB always recommends the precautionary procurement and storage of spare parts if the filter system plays a decisive role in
maintaining a production process.
Downtimes can thus be avoided or minimised.
Limitation of the number of load cycles / service life
The permissible number of load cycles service life according to AD- 2000 S1, section 1 .1.4 (unless otherwise agreed). The owner
is advised that the number of load changes that have occurred must be recorded in a suitable way.
Date: 23/02/2021
Activity
Check, replace if necessary
Check interior for deposits, clean if necessary
Clean and remove and replace with new one
Subject to change without notice
Interval
as required / at least 1x/year
as required / at least 1x/year
as required
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