It is desired to maintain a vacuum of 100 mmHg absolute pressure in a drum by removing accumulated vapors (average MW = 40 g/mol, flowrate 200 kg/h, temperature = 50°C) and discharging them to an incinerator operating at 115 kPa. Determine the steam flowrate required for a singlestage ejector system for the following steam pressures:

1. 20 bar saturated 

2. 10 bar saturated 

3. 5 bar saturated