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# 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.

When the heat loss from a pipe or tube is higher than the capacity of the heat trace cable - the cable must be spiral-wrapped around the pipe or tube.

The "heat loss - cable output" ratio can be calculated as

HR = Qhl / Qt                                               (1)

HR = "heat loss - cable output" ratio

Qhl  = heat loss from the insulated pipe or tube (W/m, Btu/h ft)

Qt = heat output from the heat trace (W/m, Btu/h ft)

If the "heat loss - cable output" ratio - HR - is larger than one, the cable must be wrapped. The pitch - the distance between the spirals - can be estimated from the diagram below.

### Example - Heat Tracing

The heat loss from a 4" pipe is estimated to be three times (HR = 3) the heat output capacity of the tracing cable. The pitch - the distance between each spiral - can be estimated as indicated in the table below to 5 - 6 inches (125 - 150 mm).

## Related Topics

• ### Insulation

Heat transfer and heat loss from buildings and technical applications - heat transfer coefficients and insulation methods to reduce energy consumption.

## Related Documents

• ### Pipes - Insulated Heat Loss Diagrams

Heat loss (W/m) from 1/2 to 6 inches insulated pipesĀ - ranging insulation thickness 10 to 80 mm and temperature differences 20 to 180 degC.
• ### Pipes - Insulated Heat Loss Diagrams

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

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## Citation

• The Engineering ToolBox (2008). Heat Traced Pipes - Wrapping Factor. [online] Available at: https://www.engineeringtoolbox.com/heat-tracing-wrapping-factor-d_1154.html [Accessed Day Month Year].

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2.27.11