51316-7892-Establishing Operating Envelops for Material Susceptibility to Environmentally Assisted Cracking in Thermal Oil Sands Operation

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Product Number: 51316-7892-SG

ISBN: 7892 2016 CP

Author: Tesfaalem Gebremedhin Haile

Publication Date: 2016

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Process streams in thermal in-situ operations include high temperatures (> 200 ?C) high chloride concentrations (> 5000 mg/L) and varying levels of H2S. Material selection must account for these conditions and consider susceptibility to environmental assisted cracking such as chloride stress corrosion cracking and sulfide stress cracking. The main objective of this study was to investigate the environmental limits of specific materials of interest for use in thermal in-situ operations where published standards do not provide adequate guidance or are suspected to be overly conservative.The equipment component of primary interest was valve trim with interest in varying grades of stainless steels. For example 17-4 precipitation hardened stainless steel was one grade of interest and has a much higher strength than austenitic stainless steels leading to material savings and perhaps a lower component cost. The defined environmental and material limits for precipitation hardened stainless steel in ANSI/MR0175/ISO15156 restrict the ability to use these alloys under typical operating conditions seen in thermal in-situ oil sand operations. Therefore the initial objectives of this study were established to assess material susceptibility to environmental cracking as a function of operating parameters towards the understanding and development of clear operating limits in in-situ process water systems.