Conversion Charts, Technical Information, Marathon Heater Technical Library

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Marathon Heater, Inc.

Marathon Heater's Technical Library
Technical Drawings: [Band Heaters] [Coil Heaters] [Strip Heaters] [Thermocouples] [Today Heaters]

Boiling Point For Common Liquids

Temperature

Conversion Chart

Melting Point For Common Metals

Heat Losses From Molten Metal Surfaces in 70^o F air

(watts/in²)

Heat Losses From Oil or Paraffin Surfaces in 70^o Air (watts/in²)

Heat Losses From Vertical Surfaces in 70^o Air (watts/in²)

Cubic Ft. to Gallons

The easiest way to determine how much wattage you need is to multiply air flow in SCFM by the desired temperature rise in degrees F and divide by 3.

Watts=

SCFM x Temperature Rise
3

Heat Losses From Water Surfaces in 70^oAir (watts/in²)

Properties of Gasses

Gas	Density, lbs/ft³	Specific Heat BTU/lb/^oF	Thermal Conductivity BTU-in/hr-ft²-^oF
Air @ 80 ^oF	0.073	0.24	0.18
Air @ 400 ^oF	0.046	0.245	0.27
Ammonia	0.044	0.523	0.16
Argon	0.102	0.125	0.12
Carbon Dioxide	0.113	0.199	0.12
Carbon Monoxide	0.072	0.248	0.18
Chlorine	0.184	0.115	0.06
Helium	0.011	1.25	1.1
Hydrogen	0.0052	3.39	0.13
Nitrogen	0.072	0.248	0.19
Oxygen	0.082	0.218	0.18
Sulfur Dioxide	0.172	0.152	0.07
Water Vapor -212 ^oF	0.037	0.482	0.16

Maximum Allowable Watt Density for Heating Metals

Hole Clearance	1000 ^oF	800 ^oF	600 ^oF	400 ^oF	200 ^oF
0.003	25	30	35	40	45
0.005	20	25	30	35	45
0.010	20	23	28	30	38
0.015	18	20	25	27	34
0.030	16	15	20	23	30
0.100	10	12	15	20	25