Corrosion engineering in the utilization of the Raft River geothermal resource

Miller, R.L.

doi:10.2172/7336353

1976

DOI: 10.2172/7336353

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Corrosion engineering in the utilization of the Raft River geothermal resource

R.L. Miller¹

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2013

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Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications

Hurley

Olson

Ward

et al. 2013

Engineering Failure Analysis

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Direct use geothermal heating relies on heat extracted from naturally occurring geothermal water sources to provide heating needs for commercial and residential use. The city of Boise, Idaho maintains the largest district geothermal heating system in the United States, utilizing a source of geothermal water at 80°C. 304 Stainless steel (UNS S30400) pipe clamps are used throughout the system as repair seals and for new service connections. Occasionally unexpected fracture of the stainless steel clamps occurs with time-in-service periods as short as 1 year. A failure analysis was conducted, including visual, microstructural, compositional, and mechanical characterization, to determine the cause and source of the degradation. Cracking of the clamps was limited to localized regions with the remainder of the clamp unaffected. Branched, brittle cracks were observed in the failure region and exhibited transgranular propagation. Based on the temperature, available moisture, stress level, and type of material used it was determined that the likely cause of failure was neutral pH, dilute chloride-induced stress corrosion cracking. Based on this failure analysis, geothermal or other buried heated water systems must consider protective measures or more SCC-resistant materials to prevent susceptible conditions from developing, compared to conventional water systems, to ensure maximum lifetime performance.Keywords: stainless steel; stress corrosion cracking; transgranular; geothermal; chloride. This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Engineering Failure Analysis, published by Elsevier. Copyright restrictions may apply.

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Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications

Hurley

Olson

Ward

et al. 2013

Engineering Failure Analysis

View full text Add to dashboard Cite

show abstract

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Corrosion engineering in the utilization of the Raft River geothermal resource

Cited by 1 publication

References 3 publications

Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications

Transgranular stress corrosion cracking of 304L stainless steel pipe clamps in direct use geothermal water heating applications

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