Page 589 - Dust Explosions in the Process Industries

556 Dust Explosions in the Process Industries

6
2.
Ill 3 1

Legend: 1 Zone 22 usually I m radius
2 Zone20
3 Floor
4 Bag dischargehopper
5 To process
6 Toextract

Figure 8.2 Marking of zones 20 and 22 on a hazardous area classification map of a station for
emptying bags containing combustible powder into a hopper equipped with dust extraction (From
CENELEC, 2002).

10

.2
6

11
15
Legend: 1 Zone22 6 Inlet 11 Zone21
2 Zone20 7 Filter
3 Floor 8 To fines bin
4 Cyclone 9 Extract fan
5 To product silo 10 To outlet
Figure 8.3 Marking of zones 20,2 1, and 22 on hazardous area classificationmap of a dust collec-
tion plant comprising a cyclone and a filter in series (From CENELEC, 2002).