25 Cr super duplex stainless steel (SDSS) centrifugal pumps have found vast applications in the Oil & Gas industry for produced water injection systems. An important factor in water injection pump material selection is the need to provide adequate corrosion resistance throughout the operating life cycle. Presence of solids and/or other contaminants in the pumped fluid (e.g. traces of solids, water cut percentage, hydrogen sulphide, chlorides, oxygen, and carbon dioxide content) can impact the corrosion resistance of water injection pumps. SDSS material is used in critical pump components such as casing body, impellers, shafts, balancing lines etc. The main focus of this paper is to present two cases of SDSS centrifugal pump component failures associated with a casing body and balancing line. Pitting corrosion mechanism was found to be the root cause of the both pump component failures. The factors contributed to these two failures will be discussed, in addition lessons learned & mitigation measures will be proposed.

Subject
Super duplex stainless steel, Materials, Microstructure, Leaks, Chemical composition, Pores, Mechanical failure, Repair, Corrosion resistance, Pitting resistance equivalent number, Ferrite, Casting, Samples
Keywords:
Super duplex stainless steel, pumps, material selection, pitting corrosion, corrosion threats
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2022
Association for Materials Protection and Performance (AMPP)
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