23
Dalamatic Insertable Dust Collectors – Series DLM V
Installation, Operation and Maintenance Manual
MAINTENANCE
Any abnormal change in pressure differential across the filter elements indicates
a change in operating conditions and a fault to be rectified. For example, a
prolonged stoppage of compressed air will cause an excessive build-up of dust
on the elements, resulting in a greatly increased pressure drop.
After the fault has been rectified, resumption of compressed air cleaning will usually
return the collector to normal efficiency. However, it is advis able to operate the
controller in still-air conditions for a short period to dislodge any accumulated
dust before putting the Dalamatic dust collector into operation.
Filter element resistance can be checked by connecting a U-tube manometer
or differential-type pressure gauge to tapping points on the collector body and
equipment being served (see fig. 1). This will give a continuous indication of the
state of the filter elements. 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.
To fit manometer connection to tapping point position, remove hexagon
head set screw, nut and washers which blank-off tapping point hole
located in base side panel. If exit header is fitted, access may be gained
by removing the header cover. Fit a suitable manometer connection in
place of the hexagon head set screw etc., ensuring it is capped when
not in use. If requested, Donaldson can supply the recommended parts
to enable connection to measuring equipment.
It is recommended to periodically inspect the general casing integrity.
Ignition minimising fans are fitted with a lining inside the casing. As
this may only offer protection for a limited period, any upset condition
leading to rubbing, the fan must be switched off immediately and the
condition corrected.
Do not operate above recommended compressed air pressure.
Excessive pressure will reduce the working life of components.
Dalamatic housings or upstands fitted with explosion relief should be
inspected weekly to ensure that the burst ing panels are intact and clear
of obstruction. During winter, particular care must be taken to prevent
build-up of snow or ice on explosion panels.
Servicing schedule
A record of all pressure checks should be kept in a log book to aid the speedy
diagnosis of faulty operation.
Weekly
1 Open the valve at the bottom of the moisture separator bowl and allow the
collected water to drain off, then close the valve.
2 Connect a manometer to tapping points (refer to Routine inspection) and
measure the pressure drop across the filter elements.
