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Transvac Steam Jet Thermocompressors are energy saving devices that compress low pressure steam, often waste steam, to a higher useable pressure.


Transvac Thermocompressors can contribute substantially in reducing energy costs by recovering waste or flash steam and putting it back into the process at a useful pressure. This technology can in many cases produce steam savings of 15 – 20%.


Transvac has been designing these systems for over 45 years and each unit is designed specifically to suit a customer’s process requirements to ensure maximum operating efficiency. Sometimes, Thermocompressors are combined with Desuperheaters if the steam is to be used for a heating duty.


Transvac Thermocompressor systems can be used in numerous applications where low-pressure steam (either from a process, a flash vessel, or turbine exhaust) is available and boosted to a usable pressure by using high pressure motive steam. Typical generic applications involve recovering both condensate and flash steam.



For a given set of operating conditions a ratio of entrained suction vapour to motive vapour is determined and the amount of motive steam is calculated. The mass and pressure of the motive steam determines the size of the motive steam nozzle.


Although a standard Transvac Steam Jet Thermocompressor is suitable for most applications it has a relatively limited operating range due to the fixed bore steam nozzle. For applications with varying operating conditions Transvac offers a variable nozzle design to ensure efficient performance is maintained over the range of desired operation. To achieve variable performance a steam regulating spindle is fitted to the nozzle and actuated either manually or automatically.



The robust, simple construction consists of three fundamental components: Motive Steam Nozzle, Suction body and a Diffuser (Throat).


A wide range of materials of construction are available including stainless steels, carbon steel, Titanium, chrome molybdenum etc.