A vacuum producing device, without any moving part, which uses high velocity steam as a motive fluid. The design of the unit is extremely critical in view of the large steam consumption and requirement of high levels of vacuum. Based on the collaborative work at Central Mechanical Engineering Institute, Durgapur; mathematical model for the steam jet ejector has been developed and successful design of commercial units undertaken by EIL. However, to further investigate and refine the design tools, a multistage high vacuum ejector system with barometric intercondensers and aftercondensers capable of operating near the industrial throughput has been installed. Salient features being :

• Suction pressure          -    5  mm Hg abs
• Discharge pressure      -   811 mm Hg abs
• Suction capacity          -  100 kg/hr
• Motive steam pressure  -  15 kg/cm2 g