Installation, Operation and Maintenance manual
16
PowerCore
®
Dust Collectors - Series CPC
Explosion relief
Explosion panels, if fitted, must be relieved to a safe area in accordance with
Factory Inspectorate recommendations. The explosion relief area is suitable
for the collector volume only. Fitment of the collector to larger vessels will
require additional explosion protection to be fitted to the vessel. This protection
should ensure that pressures developed during an explosion are lower than the
collector strength. Consult Donaldson for specific collector design pressures.
Refer to Table 1 for predicted flame lengths during an explosion.
If providing a facility to shut down the equipment in the event of an explosion, the
signal should be taken from the explosion relief panel detection device (refer to
figure 8). If the collector is fitted with a Power Box, the signal may be connected to
the input circuits of the Power Box.
When connecting to the detection device, the following must be taken into
account:
•
maximum supply voltage: 30V DC
•
maximum current: 100mA / 3W
When the detection device is located in a hazardous area, the electric circuit
to the indicator must be intrinsically safe (e.g. by using an isolation amplifier).
TABLE 1 – PREDICTED FLAME LENGTHS
(calculation based on VDI 3673)
Type:
CPC-3
CPC-4
CPC-6
CPC-8
CPC-12
Flame length:
8.4 m
9.5 m
12.6 m
13.2 m
15.0 m
To Machine/Process
Control Circuit
Explosion
panel detection
device
Intrinsical
ly saf
e
bar
rier (if required)
Hazardous area
(if applicable)
Explosion
panel detection
device
Figure 7: Explosion relief detection device circuit diagram
