Light vs Heavy Steam Tracing

In a steam traced tubing bundle, a steam tracer tube runs beside the process tube inside the insulation. How closely the two touch decides how much heat reaches the process: in heavy tracing they are in direct contact; in light tracing they are separated. Choosing the right one keeps the fluid hot enough without overheating it.

Heavy and light steam tracing compared

	Heavy steam tracing	Light steam tracing
Tracer and process tube	In direct contact	Separated from each other
Heat transfer	High — maximum heat into the process	Low — gentle, controlled heat
Purpose	Heat-up and high-temperature maintenance	Stable temperature, freeze protection, viscosity maintenance
Techwin bundle performance	Maintains process over 204°C (399°F); exposure up to 260°C (500°F)	Stable process temperature without overheating the fluid
Typical services	Analyser sample lines, pressure transmission lines, high-temperature sampling	Water lines, light oil, paraffin, temperature-sensitive chemicals

When to use heavy steam tracing

The fluid must be held well above ambient — for example a hot analyser sample that would otherwise condense.
The line needs to heat up quickly from cold.
The fluid tolerates the full steam temperature at the tube wall.

When to use light steam tracing

The aim is to stop freezing or thickening, not to heat the fluid strongly.
The fluid is temperature-sensitive and could degrade, boil or polymerise at steam temperature.
Viscosity must stay steady — light oil, paraffin and some chemicals.

What decides the choice

The temperature the fluid must be kept above, and the highest it may reach
Steam pressure available — Techwin steam traced bundles take saturated steam up to 17 bar / 246 psi (204°C / 399°F)
Sensitivity of the fluid to overheating
Line length and how condensate will be removed at appropriate intervals
Personnel protection — Techwin bundles keep the outer jacket below 60°C (140°F)

Not sure whether steam or electric tracing suits the line? See the heat traced tubing buyer guide.

Steam traced tubing specifications

Frequently asked questions

What is the difference between light and heavy steam tracing?

In heavy steam tracing the steam tracer tube is in direct contact with the process tube, so heat transfer is high and the process can be held at high temperatures. In light steam tracing the tracer is separated from the process tube, so less heat reaches the fluid — enough to prevent freezing or thickening without overheating it.

When should I use light steam tracing?

Use light steam tracing for freeze protection of water lines and for light oil, paraffin and temperature-sensitive chemicals, where the fluid needs a stable temperature and must not be overheated by the steam.

What temperature can heavy steam traced tubing maintain?

Techwin heavy steam traced bundles maintain process temperatures over 204°C (399°F), with exposure up to 260°C (500°F), while the outer jacket stays below 60°C (140°F) for personnel protection.

What steam pressure do steam traced tubing bundles use?

Techwin steam traced bundles are designed for saturated steam up to 17 bar (246 psi), which corresponds to about 204°C (399°F). Condensate is removed at intervals set by the bundle design.

Choose the right tracing for your line

Send the fluid, the temperature it must be held at, steam pressure and line length, and our engineers will recommend heavy or light tracing.

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