MULTISTAGE PUMP AND SUBSEA PUMPING ARRANGEMENT

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(11)

EP 3 771 828 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	24.03.2021 Bulletin 2021/12

(43)	Date of publication:
	03.02.2021 Bulletin 2021/05

(21)	Application number: 20186675.3

(22)	Date of filing: 20.07.2020

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International Patent Classification (IPC):

F04D 7/04^(2006.01)
E21B 43/38^(2006.01)
F04D 31/00^(2006.01)
F04D 29/18^(2006.01)
F04D 25/06^(2006.01)

E21B 43/12^(2006.01)
F04D 13/08^(2006.01)
F04D 1/06^(2006.01)
F04D 17/12^(2006.01)
F04D 25/16^(2006.01)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME
	Designated Validation States:
	KH MA MD TN

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Priority:

31.07.2019 EP 20189409

(71)	Applicant: Sulzer Management AG
	8401 Winterthur (CH)

(72)	Inventors:
	De Raeve, Karel 8400 Winterthur (CH) Gassmann, Simon 8051 Zürich (CH) Kus, Bartosz 62-800 Kalisz (PL) Felix, Thomas Leeds, LS10 1GE (GB)

(74)	Representative: Intellectual Property Services GmbH
	Langfeldstrasse 88 8500 Frauenfeld 8500 Frauenfeld (CH)

(54)	MULTISTAGE PUMP AND SUBSEA PUMPING ARRANGEMENT

(57) A multistage pump is proposed configured for installation on a sea ground, having a common housing (2), a pump unit (3) arranged in the common housing, and a drive unit (4) arranged in the common housing (2), wherein the common housing (2) comprises a pump inlet (21) and a pump outlet (22), wherein the pump unit (3) comprises a plurality of impellers (31, 32, 33) for conveying a compressible fluid from the pump inlet (21) to the pump outlet (22), and a pump shaft (5), on which each impeller (31, 32, 33) is mounted, wherein each impeller (31, 32, 33) is configured as a radial or semi-axial impeller (31, 32, 33), wherein the drive unit (4) comprises a drive shaft (42) for driving the pump shaft (5), and an electric motor (41) for rotating the drive shaft (42) about an axial direction (A), wherein a coupling (8) is provided for coupling the drive shaft (42) to the pump shaft (5), wherein the pump unit (3) is configured for conveying the fluid being in the dense phase at the pump outlet (22), and wherein at least two impellers (31, 32, 33) of the plurality of impellers (31, 32, 33) have a different specific speed. Furthermore a subsea pumping arrangement is proposed.