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Distributing These Fine Products
Fireye® |
Fireye General Reference Tables
NEMA Standard Classification Codes | Power and Heat | BTU Content of Fuels | Conversion to Symmetric Units | Conversion Factors for Boiler Ratings | Electric Motors Rating | Units of Pressure
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800-876-0036
Phone: 847-356-0566 Fax: 847-356-0747 E-Mail: sales@mmcontrol.com |
General Reference Tables |
NEMA Standard Classification Codes for Flame Safety Control Enclosures |
| NEMA 1— |
General Purpose. For indoor protection, where conditions are not unusually severe. |
| NEMA 2— |
Driptight. Designed to exclude falling moisture or dirt. Particularly applicable to cooling rooms, laundries, etc., where condensation is prevalent. For indoor use. |
| NEMA 3— |
Weather Resistant (weatherproof). For outdoor use; designed to withstand all normal exposure to natural elements. Controls mounted on pullout racks for easy access. With rain hood and weather seals. |
| NEMA 4— |
Watertight. Withstands water pressure from l inch hose nozzle, 65 gallons per minute, from distance of not less than 10 feet for five minutes. Suitable for maritime applications, breweries, etc. |
| NEMA 5— |
Dust-tight. Equipped with dust-tight gaskets. Suitable for mills and other high-dust atmospheres. |
| NEMA 6— |
Submersible. For submerged operation under specified pressures and time. |
| NEMA 7— |
Hazardous Locations, National Electrical Code Class l (circuit breaks in air). |
| NEMA 8— |
Hazardous Locations, National Electrical Code Class l (circuit breaks immersed in oil). |
| NEMA 9— |
Hazardous Locations, National Electrical Code Class 2. |
| NEMA 10— |
Explosion-proof. Meets U.S. Bureau of Mines requirements for explosive atmospheres. |
| NEMA 11— |
Acid or Fume Resistant. Provides for immersion of enclosed equipment in oil. |
| NEMA 12— |
Industrial Use. Excludes oils, dust, moisture, to satisfy individual requirements. |
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POWER and HEAT |
1 BTU |
776 ft.-lb. |
1 cal |
0.003968 BTU Watt/hr. |
1 BTU |
0.293 Watt 4.2 cal/min. |
1 Watt |
3,413 BTU/hr |
1 Watt-hr. |
3.413 BTU/hr |
1 kW (1000 Watts) |
3413 BTU/hr |
1 kW/hr. |
3413 BTU/hr |
1 hp |
0.746 BTU 33,000 ft-lb./min. |
1 bhp |
9.809 kW 33,479 BTU/hr 34.5 lb. of steam per
hour. |
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BTU CONTENT of
FUELS |
Grade or Type |
Unit |
BTU |
No.1 Oil |
Gallon |
137,400 |
No.2 Oil |
Gallon |
139,600 |
No.3 Oil |
Gallon |
141,800 |
No.4 Oil |
Gallon |
145,100 |
No.5 Oil |
Gallon |
148,800 |
No.6 Oil |
Gallon |
152,400 |
Natural Gas |
cu ft. |
950 to 1,150 |
Propane |
cu ft |
2,550 |
Butane |
cu ft |
3,200 |
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Conversion to Symmetric Units |
Quantity |
Standard Unit |
SI Unit |
SI Symbol |
Multiplier to
Convert from
Standard Unit to SI Unit |
Temperature |
Degrees Fahrenheit |
Degrees Celsius |
C |
5/9 (F-32) |
Length |
Inches/Feet |
Millimeters/meters |
mm/m |
25.4/0.3048 |
Capacity—Gas Valves |
Cubic feet per hour |
Cubic meters per hour |
m 3 /hr |
0.0283168 |
Control Valve Coefficient |
C v a |
k v b |
k v |
0.857 |
Fluid Capacity |
Gallons per hour |
Liters per second |
|
0.001052 |
Heat |
BTU per cubic foot |
Megajoules per cubic meters |
MJm 3 |
0.0671 |
Pressure Drop |
Inch of water column |
Kilopascals |
kPa |
0.2486 |
Pressure |
Inch of mercury |
Kilopascals |
kPa |
3.3741 |
Pressure |
Pounds per square inch |
Kilopascals |
kPa |
6.8948 |
Power (electric) |
Horsepower |
Watts/kilowatts |
W/kW |
746/0.746 |
Weight |
Pounds |
Kilograms |
kg |
0.4536 |
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Conversion Factors for Boiler Ratings |
1. |
Boiler Horsepower |
2. |
33,475 BTU's per hour (output) |
3. |
34.5 lbs. steam per hour (from and at 210° F to 100° C. |
4. |
9810.6 watt (output) |
5. |
1 lb. steam per hour 970 BTU's per hour (output) (from 212° F or 100° C) |
6. |
284.3 watts (output) |
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|
Boiler
Horsepower |
Pounds Steam
Per Hour |
BTU/Hour
(Output) |
Megawatts
Output |
|
20 |
690 |
660,500 |
.20 |
|
40 |
1,380 |
1,339,000 |
.39 |
|
60 |
2,070 |
2,008,500 |
.59 |
|
80 |
2,760 |
2,678,000 |
.78 |
|
100 |
3,450 |
3,347.500 |
.98 |
|
150 |
5,200 |
5,021,250 |
1.47 |
|
200 |
6,900 |
6,695,000 |
1.96 |
|
250 |
8,600 |
8,368,750 |
2.45 |
|
300 |
10,500 |
10,042,500 |
2.94 |
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Electric Motors Rating
|
Approximate
Horsepower |
120V |
240V |
Full Load |
Locked Rotor |
Full Load |
Locked Rotor |
1/6 ac
dc |
4,4
— |
26.4
— |
2.2
— |
13.2
— |
1/4 ac
dc |
5.8
3.1 |
34.8
31.0 |
2.9
1.6 |
17.4
16.0 |
1/3 ac
dc |
7.2
4.1 |
43.2
41.0 |
3.6
2.0 |
21.6
20.0 |
1/2 ac
dc |
9.8
5.4 |
58.8
54.0 |
4.9
2.7 |
29.4
27.0 |
3/4 ac
dc |
13.8
7.6 |
82.8
76.0 |
6.9
3.8 |
41.4
38.0 |
1 ac
dc |
16.0
9.5 |
96.0
95.0 |
8.0
4.7 |
48.0
47.0 |
1 1/2 ac
dc |
20.0
9.5 |
120.0
95.0 |
10.0
4.7 |
60.0
47.0 |
2 ac
dc |
24.0
17.0 |
144.0
170.0 |
12.0
8.5 |
72.0
85.0 |
3 ac
dc |
34.0
25.0 |
204.0
250.0 |
17.0
12.2 |
102.0
122.0 |
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Units of Pressure
|
Known Pressure
Unit |
Required Pressure Unit |
Kilopascal
s |
Pounds per
Sp. Inch |
Ounces per
Sq. Inch |
Millimeters
of Mercury |
Kilograms
Sq. Inch |
Inches of
Water |
Inches of
Mercury |
Feet of
Water |
Centimeters
of Water |
Centimeters of Water |
0.0981 |
0.0142 |
0.227 |
0.735 |
0.000999 |
0.394 |
0.0289 |
0.0328 |
- |
Feet of Water |
2.99 |
0.433 |
6.94 |
22.4 |
0.0305 |
12.0 |
0.883 |
- |
30.5 |
Inches of Mercury |
0.249 |
0.0361 |
0.578 |
1.87 |
0.00254 |
- |
0.0735 |
0.0833 |
2.54 |
Inches of Water |
98.1 |
0.0361 |
0.578 |
735.0 |
- |
394.0 |
29.0 |
32.8 |
1000.0 |
Kilograms/sq. inch |
0.133 |
0.0193 |
0.308 |
- |
0.00136 |
0.535 |
0.0394 |
0.0446 |
1.36 |
Millemeters of
Mercury |
0.133 |
0.0193 |
0.308 |
- |
0.00136 |
0.535 |
0.0394 |
0.0446 |
1.36 |
Ounces/sq. inch |
0.431 |
0.0625 |
- |
-8.24 |
0.00439 |
1.73 |
0.128 |
0.144 |
4.40 |
Pounds/sq. inch |
6.89 |
- |
16.0 |
51.7 |
0.0703 |
27.7 |
2.04 |
2.31 |
70.4 |
Kilopascals |
- |
0.145 |
2.32 |
7.52 |
0.010 |
4.02 |
0.295 |
0.334 |
10.2 |
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