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Pipes - Insulated Heat Loss Diagrams

The heat loss diagrams below can be used to indicate the heat loss from insulated pipes at various temperature differences. The diagrams are based on

• metal pipes
• fiber glass insulation with thermal conductivity 0.036 W/(mK)
• outdoor condition with moderate wind 9 m/s

A safety factor of 10% is included.

• indoor location - reduce values with 10%
• mineral wool insulation - increase values with 6%
• rigid cellular polyurethane - reduce values by 30%
• Heat loss diagram (W/m)

Pipe Heat Loss - Insulation thickness 80 mm

• 1 W/m = 0.305 W/ft
• 1 oC = 1.8 oF

Example - Heat Loss from Insulated Pipe Line

100 m of steel pipe with nominal dimension 2 1/2 inches is insulated with 80 mm fiber glass insulation. The temperature of the fluid in the pipe is 90 oC and the ambient temperature outside the pipe is 10 oC.

From the diagram above - 80 mm fiber glass insulation, temperature difference 80 oC and pipe dimension 2 1/2" - the heat loss is approximately 20 W/m.

The heat loss from the whole pipe can be calculated as

(100 m) (20 W/m)

= 2000 W

.

.

Related Topics

• Heat Loss and Insulation

Heat loss from pipes, tubes and tanks - with and without insulation. Use of materials lke foam, fiberglass, rockwool and more.

• Insulation

Calculate heat transfer and heat loss from buildings and technical applications. Heat transfer coefficients and insulation methods available for reduction of energy consumption.

• 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.

• Water Systems

Design of hot and cold water service and utility systems with properties, capacities, sizing of pipe lines and more.

Related Documents

Calcium Silicate Insulation

Thermal conductivity of calcium silicate insulation - temperature and k-values.

Copper Tubes - Heat Losses

Heat loss from uninsulated copper tubes vs. temperature differences between tube and air.

Copper Tubes - Uninsulated Heat Losses

Heat loss from uninsulated copper pipes - dimensions ranging 1/2 - 4 inches.

Fiberglass Insulation

Thermal conductivity of fiberglass insulation - temperature and k-values.

Heat Loss from Oil Filled Tanks and Pipe Lines

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

Heat Traced Pipes - Wrapping Factor

Wrapping factor when the heat loss from a pipe or tube is higher than the capacity of the heat trace cable.

Hot Water Circulation System - Return Pipes

Hot water can be circulated through a return pipe if it's instantly required at the fixtures.

Insulated Copper Tubes - Heat Loss

Heat loss to surrounding air from insulated copper tubes.

Mineral Wool Insulation

Thermal conductivity - k-values - vs. temperature.

Oil Filled Tanks - Heat Loss

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

Pipes - Insulated Heat Loss Diagrams

Heat loss (W/ft) diagrams for 1/2 to 6 inches insulated pipes - ranging insulation thickness 0.5 to 4 inches and temperature differences 50 to 350 degF.

Pipes and Cylinders - Conductive Heat Losses

Conductive heat losses through cylinder or pipe walls.

Polyurethane Insulation

Thermal conductivity - k-values - vs. temperature.

Steam Pipes - Heat Losses

The amount of condensate generated in a steam pipe depends on the heat loss from the pipe to the surroundings.

Steam Pipes - Heat Losses (W/m)

Heat losses from un-insulated steam pipes.

Steam Tracing Pipe Lines

Steam tracing of pipe lines can be done to maintain appropriate product temperatures.

Steel Pipes - Heat Loss Diagram

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

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