November 2004

Materials/Reliability

Introduction to NACE standard MR0103

Use these materials to reduce sulfide stress cracking in corrosive refinery environments

Brown, J. C., Motiva Enterprises; Bush, D. R., Emerson Process Management/Fisher Controls Intl. LLC; Lewis, K .R., Shell Global Solutions International BV

Many process streams in petroleum refineries contain enough H2S to cause sulfide stress cracking (SSC) in susceptible materials. Until recently, however, no industry standard was available that covered material requirements for sour refinery service. In April 2003, NACE International released MR0103, ?Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments.?1 Several motivating factors led to the development: Although refineries sometimes specify materials compliant with NACE MR0175,2 application practices varied widely among engineering contractors and users. Refinery ?sour? environments are quite different from the sour environment

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