Hot Oil Units – Myriadly

HOT OIL UNIT (HOU)

A Hot Oil Unit (HOU) is a closed-loop heating system that uses a thermal fluid (hot oil) instead of steam or direct fire to transfer heat to a process.
The heat transfer oil is heated in a heater (usually by electric elements or a fired heater) and circulated to the process.
Common in applications requiring precise, uniform heating up to 300–400 °C without high pressure.

APPLICATIONS

Jacket heating for polymerization, resin production
Fryers, oil heating, deodorizing
Tank heating, bitumen processing
Dryers and calenders
Extruders, vulcanizing process
Process heating for reactors and distillation

ELEMENTS

Thermal Oil Heater – Fired or electric type heater.
Circulation Pump – Maintains oil flow through the loop.
Expansion Tank – Accommodates oil expansion due to heating.
Process Heat Jackets – Transfers heat to the process.
Control Panel – For temperature and flow control, alarms, and safety interlocks.
Piping & Valves – For circulation and isolation.
Strainers – Removes contaminants from oil.
Safety Devices – Pressure relief valve, temperature limiters, low-flow alarms.

TECHNICAL PARAMETERS

Parameter	Typical Range / Notes
Heating Medium	Synthetic thermal oil or mineral-based heat transfer oil
Operating Pressure	Usually < 5 bar (low pressure)
Material of Construction (MOC)	Stainless Steel, Mild steel
Heat Source	Gas, diesel, electricity, biomass
Efficiency	85–92% (fired heater)

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