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Pipes Submerged in Oil or Fat - Heat Emission

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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

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