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A new design for testing crevice corrosion on tube has been developed and qualified using finite elements simulations. The results show a relatively good distribution in pressure below the gasket.
Crevice corrosion resistance is one of the main criteria for the selection of a given stainless steel grade for seawater applications. Crevice corrosion resistance can be evaluated using different techniques that are described in standards and in the literature. However, the proposed assemblies are often restricted to plate geometry specimens. Some crevice assemblies for tube geometry have been proposed and used during the last ten years, but they showed a large dispersion of the results due to the difficulty to control crevice geometries on curved surfaces. From this background, an optimized crevice assembly was proposed to allow a better control of the reproducibility of crevice corrosion tests on stainless steel tubes.
Finite element modelling and laboratory testing have shown that the new proposed design provides a better control of gasket pressure and consequently a better reproducibility than previous existing assemblies. The proposed assembly can be adapted and used for fit-for-purpose testing (e. g. evaluation of different gasket materials, different gasket pressures, etc.).
Key words: Marine corrosion, tubes, crevice corrosion, stainless steel
13Cr Super Martensitic Stainless Steel (SMSS) is commonly used in the Oil & Gas industry. The present work has been aimed at evaluating the influence of different heat treatment processes on the corrosion resistance of 110 ksi 13Cr SMSS.
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To better understand and quantify the effect of crevice geometry, several crevice configurations simulating service conditions were evaluated including flanges assembled with gaskets, bolts mounted with nuts to plates, and the standard CREVCORR-type crevice formers.
This paper presents environmental performance data on welded nickel alloy under high temperature, high pressure, ‘ultra-sour’ conditions. Welded coupons of nickel alloy UNS N06625 were subjected to three levels of nominal stress and tested for 30 days.