An Ejector use steam or gas as a motive medium rather than a liquid to entrain and compress a secondary lower pressure steam or gas. They can be used anywhere a vacuum is required,  a vessel needs priming, a flue gas needs exhausting or a low pressure waste gas needs compressing to a higher useable pressure.

As a rule an Ejector operates at sonic conditions with Bamford & Morris Ejectors designed to HEI standards and the two choke principle. This is where the motive gas is passed through the inlet nozzle and accelerated to critical (supersonic) velocities to create a sonic choke. The kinetic energy and pressure drop in the motive flow generates the suction pressure and by the process of impulse transfer entrains the secondary lower pressure gas. The throat diameter creates a second sonic choke which limits the achievable suction flowrate and thereby determines the achievable discharge pressure.

Thermocompressor, Steam Ejector, Steam Recovery, Steam Compression, Booster, Steam Eductor


  • Are a specific type of Ejector designed for compressing / recycling steam.
  • Up to 10:1 compression ratios are achievable with a single Thermocompressor. Greater turndown can be achieved with multiple Thermocompressors installed in series.
  • Have a fixed internal geometry and are optimised for a specific duty but coupled with an actuator and variable area nozzle performance across a range of  operating duties is possible.
  • Efficiencies in operation can be achieved by installing varying sizes of Thermcompressor in parallel so that they can be turned on / off according to loading requirements.

Steam Ejector (Jacketed), Vacuum Ejector, Booster Ejector, Vacuum Package, Distillation Ejector, Priming Ejector, Start up Ejector,
Steam Ejector (Jacketed)

Steam Ejectors 

  • Mainly used for creating vacuums, evacuating vessels and priming applications
  • Use high pressure steam to entrain a secondary low pressure, sub atmospheric, gaseous fluid and by using a series of Ejectors suction pressures of 0.1mm Hg abs can be achieved.
  • Most common suction gases are air and nitrogen but can be designed for any gas aslong as the molecular weight, pressure and temperature are known.
  • For high vacuum applications which generate low temperatures heated jackets can be incorporated into the design.

Steam Jet Syphon, Steam Pump, Steam Heater, Jet Pump, Gas Pump, Bund Pump
Steam Jet Syphon

Steam Jet Syphons

  • Uses a higher pressure steam to pump and entrain a liquid.
  • Operation limited to 6mh suction, 30 mh discharge pressure and a maximum of 10 barg motive pressure.
  • Usually use waste steam or steam from a ring main to pump water from bunds or tanks. But if the mol.wt is known other fluids can be accommodated for in the design.
  • Normally manufactured in sizes from 1"nb to 6"nb,  supplied with threaded connections and available in all comercialy available materials.

Air / Gas Ejector, Air Ejector, Gas Ejector, Vacuum Ejector, Sampling Ejector, Distillation Ejector, Recycling Ejector, Booster Ejector, Recovery Ejector
Air / Gas Ejector

Air / Gas Ejectors

  • Same basic design principles as a Steam Ejector but designed to operate for any / all gases other than steam.
  • As long as the molecular weight, temperature and pressure are known an ejector can be designed for use with any ideal gas.
  • Primarily used for vacuum applications as well as pumping, mixing and compressing of gases. 
  • Can be manufactured in any size up to 32" nb from any commercially available material.

Pneumatic Conveyor, Solids Ejector, Venturi Feed, Dilute Phase, Dilute Phase Conveyor, Air, Solids, Powder, Transport
Pneumatic Conveyor

Pneumatic Conveyance

  • Ejectors designed for dilute phase pneumatic conveyance are different from normal ejectors in that they primarily operate at sub critical velocities.
  • Designed for transporting powders, pellets and solids in a low pressure, high velocity air flow typically in the range of 20 - 40 m/s through pipework up to 50 metres in length.
  • Ideal for use with blowers rather than compressors.
  • Case hardened materials available to ensure long operation life.