Installation, Operation and Maintenance manual
17
DFPRE 4 Dust Collectors
After the fault has been rectified, resumption of compressed air cleaning will usually
return the filter to normal efficiency. However, it is advis able to operate the in still-air
conditions for a short period to dislodge any accumulated dust before putting the
collector into operation.
Filter resistance can be checked by viewing the display on the front panel of the
controller. This will give a continuous indication of the state of the filter. Once running,
the operating resistance will be relatively stable, the actual value depending on the
air volume and the characteristics of the dust being handled.
If the differential pressure exceeds 120 mm WG, check the following:
•
The compressed air supply is installed correctly, is free of water or oil and
is maintained at the recommended pressure (refer to Table 3).
•
The differential pressure connections are not blocked.
•
The solenoid and diaphragm valves are functioning correctly.
•
The controller is operational.
•
The dust container is properly sealed.
If the differential pressure still exceeds 120 mm WG after checking the above,
then reduce the pulse cleaning interval time to see if this will improve the
cleaning of the filter cartridges and, in turn, lower the differential pressure
(details of pulse interval settings are provided in the controller manual).
If the differential pressure exceeds 150 mm WG, then the cartridges have
reached the end of their lifetime and need replacing.
Ignition minimising fans are fitted with a lining inside the casing. As this may
only offer protection for a limited period, if there is any upset condition leading
to rubbing, then the fan must be switched off immediately and the condition
corrected.
It is recommended to periodically inspect the general casing integrity.
Do not operate above recommended compressed air pressure. Excessive
pressure will reduce the working life of components.
Servicing schedule
A record of all pressure checks should be kept in a log book to aid the speedy diagnosis
of faulty operation.
Daily
1. Check level of contents in dust container and empty if ¾ full.
Weekly
1. Open valve at the bottom of moisture separator bowl and allow collected water
to drain off, then close valve.
2. Check the pressure drop across the filter by viewing the display on the front panel
of the controller. If excessive, refer to Table 1.
Every 2 weeks
1. Check for visible effluent from cleaned air outlet. If evident, refer to Table 1.
2. Check controller settings (refer to controller manual).
3. For units fitted with a sparktrap, open sparktrap inspection cover and check for
dust deposit. Clean dust to avoid fire ignition. Close inspection cover.
