Pumps – Successive stages
Patent
1996-11-08
1998-10-13
Freay, Charles G.
Pumps
Successive stages
417248, 417304, 417440, 418 9, 418 83, F04B 300, F04B 2300, F01C 130
Patent
active
058203540
ABSTRACT:
At least two progressing cavity pumps or pump sections are connected in series. The flow volume rate of the second pump or pump section is less than the flow volume rate of the first pump or pump section. If there are more than two pumps or pumps sections, the flow volume rate of the third pump or pump section would be less than the flow volume rate of the second pump or pump section, and so on. The cascade arrangement of progressing cavity pumps can be achieved by interconnecting separate pump assemblies end to end. The cascade arrangement of progressing cavity pump sections can be achieved by the attachment of the rotor/stator pairs of each pump section in series with suitable universal mechanisms and housings. Such a cascade arrangement of progressing cavity pumps or pump sections allows and compensates for the compressibility of the gas in the two-phase or multi-phase fluid being pumped, especially in pumping operations requiring high differential pressures.
REFERENCES:
patent: 2691482 (1954-10-01), Ungar
patent: 3535058 (1970-10-01), Devine
patent: 3912426 (1975-10-01), Tschirky
patent: 3976400 (1976-08-01), Major
patent: 3999901 (1976-12-01), Tschirky
patent: 5171139 (1992-12-01), Underwood et al.
patent: 5472319 (1995-12-01), Rohlfing et al.
patent: 5494425 (1996-02-01), Stehr
Chang Sheldon S. L.
Mirza Kamran Z.
Wild Alan G.
Freay Charles G.
Robbins & Myers, Inc.
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