Failure Analysis of a Centrifugal Compressor Impeller Made of 17-4PH Steel in the Moist Hydrogen Sulfide Environment

Jakub Łagodziński, Zbigniew Kozanecki and Eliza Tkacz
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Jakub Łagodziński: Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Zbigniew Kozanecki: Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland
Eliza Tkacz: Institute of Turbomachinery, Lodz University of Technology, 90-924 Lodz, Poland

Energies, 2022, vol. 15, issue 12, 1-11

Abstract: The impeller under consideration is a rotor wheel of a centrifugal compressor, made of 17-4PH martensitic precipitated hardening stainless steel. Its total operating lifetime was estimated to 80,000 h, but it fractured beforehand, 4 days after the scheduled overhaul without any observed pre-symptoms. The important causes of the failure were its working conditions: a moist H 2 S environment, the applied shaft fitting stress, and the martensitic structure of its material. In the article the post-failure analysis of an impeller is described, explaining the root cause of the impeller failure by means of both experimental and Finite Element Methods (FEM). Sulfide Stress Cracking (SSC) was found to be the primary failure mechanism for the impeller under investigation. Details of the investigations and possible corrective measures to improve performance impellers used under harsh environment conditions are discussed.

Keywords: failure analysis; compressor impeller fracture; sulfide stress cracking (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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