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# Pipes Submerged in Oil or Fat - Heat Emission

The viscosity of a fluid has considerable influence on the heat transfered from a submerged heating pipe. Be aware that the viscosity of a fluid is highly dependent on the temperature.

Heat emission from steam pipes submerged in oil baths are indicated below:

Pipes Submerged in Oil or Fat - Heat Emission
ApplicationFluidHeat Emission from coil surface
(Btu/ft2 hr oF)(W/m2 oC)
Steam coil with medium steam pressure and natural convection of oil Light Oils 30 170
Heavy Oils 15 - 20 85 - 115
Fats 5 - 10 30 - 60
Steam coil with medium pressure and forced convection of oil Light Oils 100 570
Heavy Oils 60 340
Fats 30 170
• Light oils - 220 SSU at 100 oF
• Heavy oils - 1100 SSU at 100 oF
• Fats - 3833 SSU at 100 oF

### Example - Heat Emission from a 2" Coil in a Fat Tank

A 10 m long 2" inch stainless steel steam coil heats a tank with fat. The steam pressure is 1 bar and the temperature in the coil is 120 oC. The temperature in the tank is 40 oC. The convection is natural with heat emission 50 W/m2oC.

The outside diameter of the pipe is 60.3 mm and the external surface of the pipe pr. m length of pipe can be calculated as

As = 2 π ((0.063 m) / 2) (1 m)

= 0.2 m2/m pipe

The heat emission from the coil as whole can be calculated as

Q = (10 m) (0.2 m2/m pipe) (50 W/m2oC) ((120 oC) - (40 oC))

= 8000 W

= 8 kW

## Related Topics

### • Heating Systems

Design of heating systems - capacities and design of boilers, pipelines, heat exchangers, expansion systems and more.

### • Insulation and Heat Loss from Steam and Condesate Pipe Lines

Heat loss from uninsulated and insulated steam and condensate pipes and tanks. Calculate insulation thicknesses.

### • Steam and Condensate

Design of steam & condensate systems with properties, capacities, sizing of pipe lines, system configuration and more.

## Related Documents

### Food and Foodstuff - Specific Heat

Specific heat of common food and foodstuff like apples, bass, beef, pork and many more.

### Fuels and Chemicals - Autoignition Temperatures

Autoignition points for fuels and chemicals like butane, coke, hydrogen, petroleum and more.

### Heat Loss from Oil Filled Tanks and Pipe Lines

Heat loss from insulated and non insulated sheltered and exposed oil tanks and pipes.

### Liquids - Kinematic Viscosities

Kinematic viscosities of some common liquids like motor oil, diesel fuel, peanut oil and many more.

### Liquids and Fluids - Specific Heats

Specific heats for some common liquids and fluids - acetone, oil, paraffin, water and many more.

### Oil Filled Tanks - Heat Loss

Heat loss from insulated and uninsulated, sheltered and exposed heated oil tanks.

### Oil Tanks - Heat Loss

Heat loss from lagged and unlagged, sheltered and exposed oil tanks.

### Pipes - Bare Surface Heat Loss

Heat loss vs. surface temperature.

### Pipes and Cylinders - Conductive Heat Losses

Conductive heat losses through cylinder or pipe walls.

### Pipes Submerged in Water - Heat Emission

Heat emision from steam or water heating pipes submerged in water - assisted (forced) or natural circulation.

### Specific Heat of common Substances

Specific heat of products like wet mud, granite, sandy clay, quartz sand and more.

### Steel Pipes - Heat Loss Diagram

Heat loss from steel pipes and tubes - dimensions 1/2 to 12 inches.

### Submerged Coils - Heat Transfer Coefficients

Heat transfer coefficients for steam and hot water coils submerged in oil tanks.

### Viscosity - Absolute (Dynamic) vs. Kinematic

Vicosity is a fluid's resistance to flow and can be valued as dynamic (absolute) or kinematic.

### Water - Thermophysical Properties

Thermal properties of water at different temperatures like density, freezing temperature, boiling temperature, latent heat of melting, latent heat of evaporation, critical temperature and more.

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