ADDITIVE MANUFACTURING OF JACKET WATER PUMP IMPELLER FOR USCG CUTTER EMERGENCY DIESEL GENERATOR
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Authors
Rice, Megan N.
Subjects
jacket water pump
centrifugal pump
failure modes
pump failures
bearing
shaft
shaft seal
additive manufacturing
centrifugal pump
failure modes
pump failures
bearing
shaft
shaft seal
additive manufacturing
Advisors
Hobson, Garth V.
Smith, Walter C.
Date of Issue
2024-06
Date
Publisher
Monterey, CA; Naval Postgraduate School
Language
Abstract
This project aimed to reverse engineer an impeller for an obsolete, cast iron centrifugal jacket water pump currently operating on the U.S. Coast Guard’s (USCG) 270-foot cutters’ emergency diesel generators. This project’s scope represented the first phase in delivering a certifiable, working centrifugal pump comprised of an additively manufactured impeller in 316L stainless steel material. In producing this part, a global, certifiable process utilizing additive manufacturing and organic USCG and U.S. Navy resources was developed, first by analyzing the pump’s failure mechanisms, the impeller’s structure via ANSYS Mechanical software, and the pump assembly’s fluid flow via ANSYS CFX software. The U.S. Coast Guard-provided impeller design was then modified to facilitate the additive manufacturing and post-machining processes and provided to Protolabs, who subsequently produced and heat treated two new, to-scale 316L stainless steel impeller blanks and accompanying tensile specimen sets. An impeller blank was post-machined at NPS, which was a critical juncture in preparing for the next phase of this project. The finished impeller will be balanced and assembled with other provided and procured components, and then the assembled pump will be tested and compared to expected performance data. Upon the satisfactory test, a new viable spare pump will be delivered to the USCG for subsequent testing and then implementation on operational assets.
Type
Thesis
Description
Series/Report No
Organization
Identifiers
NPS Report Number
Sponsors
U.S. Coast Guard
CAMRE
CAMRE
Funder
Format
Citation
Distribution Statement
Distribution Statement A. Approved for public release: Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.