When customers request NACE treatment, how is it generally handled?
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This post was last edited by MacDon on 2024-12-6 at 10:38. Generally, compliance with MR0175 and MR0105 is required. 1. Does the valve body need to meet these standards, or do the internal components of the valve as well? This involves raw materials such as castings and bars. What will these raw material manufacturers do? 2. I’ve heard that valves from Wenzhou need to undergo heat treatment (by being heated in a furnace for 12 hours), but it seems that this may not meet NACE standards, and the additional cost is not significant either. It seems that if the customer doesn’t press for it or doesn’t request a test report, there’s no difference in supplying the product normally. If anyone has gone through the entire process and obtained a test report, please share details about this process as well as whether the cost of NACE treatment is high.
NACE MR0175 is the primary material selection standard for upstream equipment and pipelines in hydrocarbon fields containing hydrogen sulfide (H2S), including both downhole and surface facilities in such fields. This standard has been widely adopted and recognized by international oil companies and manufacturers. For the selection of materials used in surface engineering projects at hydrocarbon fields containing hydrogen sulfide, NACE MR0175 has gradually become a mandatory standard for material selection. Its main requirements include: Material selection: Appropriate materials such as carbon steel, low-alloy steel, and corrosion-resistant alloys should be chosen based on conditions such as hydrogen sulfide concentration, temperature, and pressure. The materials must meet specific requirements regarding chemical composition, mechanical properties, and corrosion resistance. Resistance to hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC): The material must undergo HIC and SSC tests to ensure it has good resistance to cracking in environments containing hydrogen sulfide. Under certain circumstances, other types of corrosion tests may also be required, such as stress corrosion cracking (SCC) tests. Welding and heat treatment: Welded joints must meet specific requirements regarding mechanical properties and corrosion resistance. The heat treatment process must be strictly controlled to ensure that the structure and properties of the material meet the requirements. Inspection and testing: Visual inspection, non-destructive testing, hardness testing, etc. are carried out on the materials and welded joints. Metallographic structure analysis, chemical composition analysis, etc. are carried out as needed. NACE MR0105 (which may refer to other NACE standards or specific requirements related to MR0175) It should be noted that NACE does not have a standard explicitly named MR0105; it might instead refer to other NACE standards or specific requirements associated with MR0175. In the absence of specific information, here are some general requirements that may be relevant: Equipment design and manufacturing: The equipment must be designed and manufactured in accordance with specific standards to ensure its structural integrity and reliability. It may involve requirements regarding the design, manufacturing, and inspection of pressure vessels. Material certification and quality control: Materials must be certified to ensure they meet the requirements of NACE standards or other relevant standards. Strict quality control measures are implemented to ensure the manufacturing quality of materials and equipment.
NACE treatment refers to compliance with the standards set by the NACE International organization regarding material corrosion resistance. To meet the customer’s requirements for compliance with MR0175 and MR0105, specific materials and manufacturing processes are typically used to ensure that the equipment or components have sufficient corrosion resistance in a hydrogen sulfide (H2S) environment. This includes selecting appropriate corrosion-resistant materials, performing proper heat treatment, and applying anti-corrosion coatings. The specific procedures need to be determined based on the operating conditions and design requirements of the equipment. .
We are meeting the requirements of NACE standards or other relevant standards. At that time, all components need to undergo heat treatment using low-carbon steel, to ensure that the carbon content remains within the range of 0.10%-0.25%. The manganese content must not exceed a certain limit (such as 1.65%), the sulfur content should generally be no more than 0.004%, and the silicon content should not exceed 1.0%. After that, all components are subjected to coloring flaw detection, with particular attention paid to the welded areas, to ensure that there are no cracks, pores, or other defects at all; this reduces the associated costs.