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The Use of 13Cr4Ni Valves in Extreme Sour Conditions: Why It Works

Looking at martensitic stainless steels (MSS) NACE MR0175 / ISO 15156 lists six tables with different H2S acceptance levels. Generic Table A.18 lists several MSS with a maximum allowable partial pressure H2S of 0.1 bar whilst equipment specific Table A.23 (Wellhead and tree components and valve and choke components) shows no restrictions when it comes to partial pressure H2S.To substantiate the applicability of Table A.23 a study was performed to evaluate environmentally-assisted cracking resistance of cast alloy CA6NM (UNS J91540) in highly sour environments (Level VII) and the implications of the findings on the usage of CA6NM as pressure containing valve bodies in wellheads.After that a ballot (no. 2013-03) was written to clarify the scope of Table A.23 and limit the use of cast alloy CA6NM (UNS J91540) based on applied in situ stress. An additional note was incorporated for UNS J91540; "Low-carbon martensitic stainless steel J91540; the maximum design tensile stress shall not exceed 2/3 specified minimum yield strength or 345 MPa (50 ksi) whichever is less." The presentation will include field history a historic perspective of NACE MR0175 results of NACE level VII tests the ballot process including an FEA study to simulate stress distribution in valves for wellhead equipment.

Product Number: 51319-12765-SG
Author: Roy Wolters
Publication Date: 2019
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