Calorifier Sets



Electric HTF Heaters
Thermal Fluid Heating Processes
Hot Oil System Inspection and Service
HTF & Hot Oil Heating Plant Maintenance

Operational Parameters

HTF and hot oil systems can be worked either side of atmospheric pressure, although pressurised installations allowing operation above their normal saturation temperatures are more complex than for steam - partly through need to inhibit oxidation of the working medium. Even so, a synthetic HTF or thermal oil heater can run at 300 deg.C under normal pressure, whilst saturation pressure for dry steam at that temperature is around 85 barg. No thermodynamic pressure is induced where the fluid vapour pressure remains below atmospheric, and engineering costs are much-reduced if systems are to operate only under gravity head.

Thermal Fluid Heaters

Dove Thermal Engineering has built fired- and unfired plant & equipment for Therminol and Dowtherm thermal fluid and Shell Thermia hot oil systems. We have successfully worked Solutia T66 at temperatures to 340 deg.C under atmospheric pressure - as for our Klieverik thermo-bonding calendering machine installation (see Gallery page). The isometric shows a modularized pair of electric calorifiers.

HTF & Hot Oil System Service and Repair

Heat transfer oils and synthetic fluids deteriorate with time - whether by oxidation, or through thermal cracking of their molecular structure. Oxidation occurs unless the system is arranged to minimize exposure of the fluid to atmospheric air - either through expansion vessel configuration or nitrogen blanketing of its contents. Stability of the HTF depends upon working temperature, operational profiles, and system design. Carbonization onto the inside walls of heater tubes - and associated sludge entrainment in the recirculating fluid - progressively act to deteriorate heat transfer performance and increase risk of plant failure. We provide inspection and maintenance services for systems and working fluids, to protect heating plants and the production equipment in circuit with them.

Typical Capacity and Workscope:

Liquid Phase Heating Plant for International Automotive Components
Electric thermal oil heater installation for Sigma Technologies
Pressurized HTF Plant Rectification for Midland Oil Refinery
Thermal Fluid Heating Plant for Tiflex Limited
HTF heating plant & equipment for Flint Ink