Application Engineering Basics

Specific Gravity and Density of Various Gases at 60ºF (1 ATM)


Gas or Vapor
Chemical Formula
Specific Gravity
Density
(lbs./cu/ft.)
Acetylene
CH
0.899
.0686
Air
—
1.00
.0763
Ammonia
NH
0.587
.0454
Argon
A
1.377
.1053
Benzene
CH
2.70
.205
Carbon Dioxide
CO
1.539
.1166
Chlorine
CI
2.448
.0738
Ethane
CH
1.038
.0799
Ethylene
CH
0.969
.0739
Helium
He
0.138
.01054
Hydrogen
H
0.0695
.00531
Hydrogen Sulfide
HS
1.19
.0897
Methane
CH
0.555
.0424
Methyl Chloride
CHCI
1.785
.1356
Nitrogen
N
0.967
.0738
Oxygen
O
1.105
.0843
Propane
CH
1.55
.1180
Sulfer Oxide
SO
2.26
.1720
Water Vapor
HO
0.622
.0373

Explosive Atomosphere Classification
North American
European
  
Class I Zone 1  
   Group A -   Group II C - Acetylene
   Group B -   Group II C - Hydrogen or equivalent hazard
   Group C -   Group II B - Ethyle ether vapors, ethylene or cyclopropane
   Group D -   Group II A - Gasoline, hexane, naptha, benzene, butane, alcohol, acetone, benzol, lacquer, vapors or natural gas
Class II    
   Group E -
—
 Metal dust
   Group F-
—
 Carbon black, coal or coke dust
   Group G -
—
 Flour, starch or grain

Temperature Conversion Chart
*In the center column, find the temperature to be converted. The equivalent temperature is in the left column, if converting to Celsius, and in the right column, if converting to Fahrenheit.

ºC Temp ºF ºC Temp ºF ºC Temp ºF ºC Temp ºF
-78.9
-73.3
-67.8
-62.2
-56.7
-51.1
-45.6
-40.0
-34.4
-28.9
-23.3
-17.8
-17.2
-16.7
-16.1
-15.6
-15.0
-14.4
-13.9
-13.3
-12.8
-12.2
-11.7
-11.1
-10.6
-10.0
-9.4
-8.9
-8.3
-7.8
-7.2
-6.7
-6.1
-5.6
-5.0
-4.4
-3.9
-3.3
-2.8
-2.2
-1.7
-1.1
-0.6
0
0.6
1.1		 -110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34		 -166
-148
-130
-112
-94
-76
-58
-40
-22
-4
14
32
33.8
35.6
37.4
39.2
41.0
42.8
44.6
46.4
48.2
50.0
51.8
53.6
55.4
57.2
59.0
60.8
62.6
64.4
66.2
68.0
69.8
71.6
73.4
75.2
77.0
78.8
80.6
82.4
84.2
86.0
87.8
89.6
91.4
93.2		 1.7
2.2
2.8
3.3
3.9
4.4
5.0
5.6
6.1
6.7
7.2
7.8
8.3
8.9
9.4
10.0
10.6
11.1
11.7
12.2
12.8
13.3
13.9
14.4
15.0
15.6
16.1
16.7
17.2
17.8
18.3
18.9
19.4
20.0
20.6
21.1
21.7
22.2
22.8
23.3
23.9
24.4
25.0
25.6
26.1
26.7		 35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80		 95.0
96.8
98.6
100.4
102.2
104.0
105.8
107.6
109.4
111.2
113.0
114.8
116.6
118.4
120.2
122.0
123.8
125.6
127.4
129.2
131.0
132.8
134.6
136.4
138.2
140.0
141.8
143.6
145.4
147.2
149.0
150.8
152.6
154.4
156.2
158.0
159.8
161.6
163.4
165.2
167.0
168.8
170.6
172.4
174.2
176.0		 27.2
27.8
28.3
28.9
29.4
30.0
30.6
31.1
31.7
32.2
32.8
33.3
33.9
34.4
35.0
35.6
36.1
36.7
37.2
37.8
43
49
54
60
66
71
77
82
88
93
99
100
1094
110
116
121
127
132
138
143
149
154
160
166
171
177
 81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
110
120
130
140
150
160
170
180
190
200
210
212
220
230
240
250
260
270
280
290
300
310
320
330
340
350 		177.8
179.6
181.4
183.2
185.0
186.8
188.6
190.4
192.2
194.0
195.8
197.6
199.4
201.2
203.0
204.8
206.6
208.4
210.2
212.0
230
248
266
284
302
320
338
356
374
392
410
413
428
446
464
482
500
518
536
554
572
590
608
626
644
662		 182
188
193
199
204
210
216
221
227
232
238
243
249
254
260
266
271
277
282
288
293
299
304
310
316
321
327
332
338
343
349
354
360
366
371
377
382
388
393
399
404
410
416
421
427
432
 360
370
380
390
400
410
420
430
440
450
460
470
480
490
500
510
520
530
540
550
560
570
580
590
600
610
620
630
640
650
660
670
680
690
700
710
720
730
740
750
760
770
780
790
800
810		 680
698
716
734
752
770
788
806
824
842
860
878
896
914
932
950
968
986
1004
1022
1040
1058
1076
1094
1112
1130
1148
1166
1184
1202
1220
1238
1256
1274
1292
1310
1328
1346
1364
1382
1400
1418
1436
1454
1472
1490

ºF - 9/5C + 32 ABSOLUTE RANKIN (R)       R - ºF+ 460
ºC = 5/9(F - 32) ABSOLUTE KELVIN (K)     K = ºC + 273

NEMA Classifications

NEMA
Type 1 -
General  Purpose - Indoor
 
Type 2 -
  Dripproof - Indoor
 
Type 3 -
Dusttight, Raintight and Sleet (Ice) Resistant - Outdoor
 
3R -
  Rainproof and Sleet (Ice) Resistant - Outdoor
 
3D -
  Dusttight, Raintight and Sleet (Ice) Proof - Outdoor
 
Type 4 -
  Watertight and Dusttight - Indoor
 
4X -
  Watertight, Dusttight and Corrosion Resistant - Outdoor
 
Type 5 -
  Superseded by Type 12 for Control Apparatus
 
Type 6 -
Submersible, Watertight, Dusttight and Sleet Resistant - Indoor and Outdoor
 
Type 7 -
Class I, Group A, B, C or D Hazardous Locations; Air Break Equipment - Indoor
 
Type 8 -
Class I, Group A, B, C, D Hazardous Locations; Oil-immersed Equipment - Indoor
 
Type 9 -
Class II, Group E, F or G Hazardous Locations; Air-break Equipment - Indoor
 
Type 10 -
Bureau of Mines
 
Type 11 -
Corrosion Resistant and Dripproof; Oil-immersed - Indoor
 
Type 12 -
Industrial Use, Dusttight and Driptight - Indoor
 
Type 13 -
Oiltight and Dusttight - Indoor

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