Selection of sulfur-resistant valves for sulfur-containing operating conditions
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Question 1: Condensate oil, designed pressure of 40 Mpa, sulfur content of 0.030. Given the high mineralization level and high chloride content, 2205 is the material of choice for pipes. Is it necessary for the valves made from 2205 to also have sulfur resistance? Question 2: In the case of wet hydrogen sulfide conditions, are sulfur-resistant valves required for all carbon steel valves? Question 3: Compared with ordinary stainless steel valves, what are the special requirements for sulfur-resistant stainless steel valves (manufacturers’ practices)?
1. 2205 duplex stainless steel has good corrosion resistance and can generally be used in sulfur-containing environments. However, in environments with high mineralization and high chloride content, it is still necessary to evaluate whether special sulfur resistance treatment is required to ensure the corrosion resistance of the valves. 2. In conditions involving humid hydrogen sulfide, carbon steel valves do indeed require sulfur resistance treatment to meet the NACE MR0175/ISO 15156 standards, thereby reducing corrosion and sulfide stress cracking caused by hydrogen sulfide. 3. Compared to ordinary stainless steel valves, sulfur-resistant stainless steel valves typically need to meet stricter corrosion resistance requirements, such as lower hardness specifications, special heat treatment processes, or additional alloying elements to enhance their resistance to sulfur. Manufacturers must produce in accordance with relevant industry standards and customer requirements. .