Thermal Fluid Systems

Thermal Fluid Systems
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Thermal fluid systems provide a solution for thermal fluid heating sometimes referred to as thermal oil heating, a type of indirect heating where a liquid phase heat transfer medium is heated and circulated to one or more heat energy users within a closed loop system. Thermal fluids offer the user the capability of high temperature operation (up to 600F with organic thermal oils and 800F with certain synthetics) at very low pressures. Due to the low operating pressure and properties of thermal oils, most heaters are built to ASME Section VIII, and a licensed boiler operator is not typically required.

Thermal Fluid Heaters: Engineered

Engineered thermal fluid heaters can be custom designed when specifications differ from those of the standard heater designs. Dirty fuels, bio‐mass fuels, and API‐560 requirements are all reasons to think about a custom engineered heater design.

Our engineers have years of experience in designing custom thermal fluid heaters to meet very specific application requirements. If you think your application needs more than a standard package system, contact one of our application engineers to find out how Sigma Thermal can help you meet your process goals without compromise.

Thermal Fluid Heaters: Economizers

Economizers mean higher thermal efficiencies and lower operating costs for thermal fluid systems. With the typical elevated operating temperatures associated with thermal oil systems, it can be difficult to obtain high efficiencies in the heater alone. By utilizing the combustion air as a heat sink for the high temperature flue gases, it is possible to reduce flue gas temperatures to 350F or lower. This can correspond to thermal efficiencies of 92% or better (LHV basis), which can represent a tremendous savings in annual operating costs. Sigma Thermal offers a wide variety of economizers to fit your process requirements and lower your operating costs.



  • Reactor vessel heating
  • Jacketed vessel heating
  • Platen or Press heating
  • Tank heating
  • Suction heating
  • Heated molds or dyes
  • Calendar roll heating
  • Ovens and fryers
  • Dryers
  • Autoclaves
  • In line liquid heating
  • In line gas heating
  • Indirect steam generators
  • Building heaters
  • Process reboilers
  • Natural gas heating
  • Crude oil heating