Document 3J94zEzMGdyr8Y6YeVqy6nJLE
Safety Engineering Tables
TABLE 47-T EXPLOSION CHARACTERISTICS OF VARIOUS DUSTS
Type of dust
Metal powders Aluminum atomized Aluminum milled Aluminum stamped Boron (85% B 8% Mg) Iron carbonyl Iron electrolytic Iron hydrogen reduced Magnesium atomized Magnesium milled Magnesium stamped Manganese Sfircon Thorium Thonum hydride Tin Titanium Titanium hydnde Uranium Uranium hydnde Vanadium Zinc Zirconium Zirconium hydnde Aluminum-cobalt alloy (60-40) Aluminum-copper alloy
(50-50) Aluminum-mcket alloy (60-40) Calcium-silicon alloy Dowmetai Ferromanganese (14% C) Ferrosilicon (80% St) Ferrotitamum low-carbon Magnesium-aluminum alloy
(50-50)
Plashes Allyl alcohol resin Butadiene-styrene resin Cellulose acetates Cellulose propionate Coumarone-mdene resin Dimethyl terephthalate Gums (arabtc copal etc) Lignin resin Methyl cellulose Methyl methacrylate Phenolic resms Pine-rosm base resin Polyacrylonitrile Polyamide Polyster resin-glass fiber mix-
ture (65-35) Polyether alcohol resin Polyethylene resin Polyethylene terephthalate Polystyrene Polyvinyl acetate resin Rubber synthetic hard Shellac Styrene-maleic anhydride
copolymer
Ignition temp of
dust cloud (den C>
Min spark energy
requtredfor tgnitton of dust cloud
(millt joules)
Min ex plosive concen tratton
(oz per 1000 tuft)
Max explosion pressure
(pst)
Rates of pressure rise (pst per set)
Aeg Max
640
15
40
90
3 500
10000+
550 45 70 2,000 4 250
550 10 35 100 10000 10 000+
470 60 13S 90
900 2500
320 20 105 50
500 7 000
320 240 200
45
500 1 000
315 80 120 45
800 1 750
600 120 10 80 2000 5 250
520
40
20
95
3 000
10 000+
520
20
20
60
3400
10 000+
450 80 125 50
300 2 750
775
80 100 105
2000
10 000
270 5 75 50 1 400 3250
260 3 80 60 2100 6 750
630 160 190
35
500 1 250
330
10
45
80
3400
10000+
440
60
70
95
3800
10000+
45
60 - 55
1600
3500
5 GO 45 2900 6250
500 60 220 35$ 200
300
600 650 480 5 40
50 65
600 1 750 800 8 750
350 60 65 60 2400 8 750
950 100 100 80 2500 8500
950 100 100
70
800 2500
960
80 190
60
2600
10 000+
540 220 600
75
400 10000+
430
80
20
85
3600
10 000+
450 80 130 45
400 4 250
860 280 400
90
500 3600
370 80 140 55 2200 9500
535
80
50
90
4000
10000+
500 20 440 60 320 10 460 45 520 10 570 20 360 30 450 20 360 20 440 15 460 10 440 500 20 500 20
440 50 460 160 410 30 500 35 490 15 520 120 320 30 400 10
470 20
35 105 25 80 25 110 25 105 15 85 30 90 30 95 40 80 30 100 20 100 2$ 80 55 80 25 90 30 90
45 85 45 65 20 80 40 90 15 90 35 75 30 95 20 75
30 80
2 600 1 400 2 800
600 2 800 3 100 1 500 1 700 1 900
500 1 700 1 900 2000
800
2 200 500 500
1,600 2 400 1,200
100 400
2 300
10000+ 4 000 8 750 4 750 8500 10 000 5000 4 750 6 000 1 750 6 000 7 500 5000 7000
6 000 1 000 3 500 7 500 7 000 3 000 3000 3500
9500
Limiting oxygen jierct ntage
ignition of dust thuds by elettnt sparks
7
4
10 13 13 3 t t 15 13 t
6 16 t 13 t OS 13 10 t 11
t
19 13
t
11
14
14 17
14 14
13 13 14
15 14
1610