Patent Number: 6,167,724

Title: Pump

Abstract: A cryogenic rotary pump for pressurizing a flow of a cryogenic liquid and for dividing the flow into a first lower pressure and a second higher pressure stream has a series of pumping chambers. A single rotary drive shaft carries a rotary inducer located in the chamber, a first impeller in the chamber, and a second impeller in the chamber. A liquid receiving chamber is located intermediate the pumping chambers. A first outlet from the pump for the first lower pressure stream is contiguous to the chamber and a second outlet is provided for the second higher pressure stream. The pump may serve to pressurize a flow of unboiled liquid oxygen from a sump of a lower pressure column of a double column also having a higher pressure column.

Inventors: Pozivil; Josef (Allschwil, CH)

Assignee: The BOC Group plc

International Classification: F04D 1/10 (20060101); F04D 1/00 (20060101); F04D 15/00 (20060101); F25J 3/04 (20060101); F25J 003/00 (); F04B 003/00 ()

Expiration Date: 01/02/2018