Determine Pump Downtime for a System

Calculate the pump downtime for a system of vessels and piping with a volume of 500 liters. The final pressure is to be 0.01 torr, starting at atmospheric. From the speed-pressure curve of a manufacturer s pump at 0.01 torr, speed is 2.0 liters/sec. At atmospheric pressure, S0 = 2.75 liters/sec with P 0 = 760 torr. From the manufacturer s data, = 15 and V 0 = 0.5 liters. 

Example 6-14 Evacuation of Vessel Using Steam Jet for Pumping Gases 

The performance and procedure use the data of Pen-berlhy for this illustration (by permission)  

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