Patent ID: 11885326
Assignee: MARINE FLOW LIMITED
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F | IPC F

Claim 11:
12. A method comprising the steps of:
a) providing a pump housing having a flexible impeller supported upon an impeller drive shaft by a mounting hub including an impeller body-engaging portion comprising a non-circular profiled portion on an outside of the mounting hub which engages with the impeller to rotationally lock the mounting hub relative to the impeller, wherein the mounting hub is detachable from the impeller, wherein the mounting hub is adapted to permit the flexible impeller to be completely decoupled for rotational movement from the impeller drive shaft during installation of the flexible impeller and then recoupled to the drive shaft for rotational movement once the flexible impeller is in position, and wherein further the mounting hub is tapered along its length to facilitate insertion of the mounting hub, and to provide centering of the impeller relative to the drive shaft as the mounting hub is inserted;
b) engaging an extraction tool with an extraction means provided on the mounting hub;
c) operating the extraction tool to extract the mounting hub from the impeller drive shaft so that the flexible impeller is completely decoupled for rotational movement from the drive shaft; and
d) thereby extracting the flexible impeller from the pump housing.