Impedance systems utilize the carrier pipe for the heating element and require no modifications to the carrier pipe. A low AC voltage is supplied to the carrier pipe, with the result being that the carrier pipe becomes the heating element. Impedance systems apply heat uniformly over the pipe surface eliminating "hot spots" which can damage sensitive materials. These systems can be used at very high temperatures and can supply enough energy to heat the material as it is flowing. Impedance systems are much more efficient and safer than other tracing systems that can provide heat inputs up to 190 W/in² (29.5 W/cm²) and temperatures up to 2,000°F (1,090°C). Several impedance systems can be connected together to heat longer pipelines.
- Raising or maintaining the temperature of
a process stream, including the fluids that
are thermally sensitive or highly viscous, or
fluids that may solidify in piping and need
liquefied prior to pumping
- Freeze Protection
- Heating corrosive materials when direct immersion
heating is not desired or practical
- Accurate temperature control to ±1°F - Available SCR power control can accurately monitor and control desired temperature
- Uniform Heating - rather than having localized 'hot spots' for transferring energy, Impedance heating allows for even, smooth heating along the entire circumference and length.
- Simple Installation - As compared to electric heating elements, additional piping, valves, wiring, etc are not needed to accommodate Impedance heating. Impedance utilizes the pipe itself and minimizes the amount of equipment needed.
- Efficient, Compact area for heat transfer - Impedance heating allows higher watt densities to be used due to increased velocities and lower pressure drops.
- Indirect Heating Contact - There are no concerns of corrosion on a heater sheath as the process is only heated by the pipe.
- Can handle warm up or temperature maintenance conditions - Impedance heating can be use for simply maintaining pipe temperatures or adding additional power to heat-up liquid flow. Impedance can also be used to liquify coagulated fluids when re-starting a system.
- No routine maintenance needed - Impedance has no moving parts that require servicing or that can cause costly shutdowns on operations.
- No double jacketing - Steam or oil traced lines have additional hazards of frozen lines, or leaky connections. Impedance totally eliminates these concerns.