Stage Ratio of Hybrid Vacuum System

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What does the hybrid consist of?

What kind of vacuum generating device?

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It consist of Roots-rotary combination of vaccum system for utilization in di-electric (insulating) oil purification system. This hybrid vacuum system is connected after two stage degassing chmaber.Following parameters are known for system designing :

Process flow rate = 6000 Lit. per hour,Sp. gravity~0.89,water content = 50 ppm,