At OGC Energy we help the energy industry with finding answers to some of their most difficult questions. We have created this section hoping that you will find answers to some of the most common questions in the following areas:

  • Corrosion in offshore industry
  • Downhole corrosion
  • Materials Selection
  • ANSI/NACE MR0175 / ISO 15156
  • H₂S

If you require technical support in metallurgy, corrosion, or welding; or if you need assistance meeting the requirements of ANSI/NACE MR0175/ISO 15156 then contact our team, we are here to help you.

  • 1.

    What is a NACE MR0175 material?

    What Is a Nace Material? A NACE material is a type of metallic material that meets the requirements of NACE MR0175, a document published by the National Association of Corrosion Engineers (NACE) that provides guidelines for metallic materials exposed to H₂S in oil and gas production environments. What Is Nace Piping? NACE piping refers to […]

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  • 2.

    H₂S partial pressure, design or operating conditions?

    Determining H₂S Partial Pressure for Sour Service: Understanding NACE MR0175 When it comes to sour service, calculating the partial pressure of H₂S (ppH₂S) is crucial for setting production environment limits for carbon steels, low-alloy steels, and corrosion-resistant alloys. But according to ANSI/NACE MR0175/ISO 15156, it’s unclear whether operating or design pressure should be considered, or […]

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  • 3.

    What is NACE MR0175 compliance?

    What Is NACE MR0175 Compliance? NACE MR0175 compliance is achieved when all materials, fabrication, and equipment conform to the requirements laid out in ANSI/NACE MR0175/ISO 15156. This international standard outlines the requirements for metallic materials exposed to H₂S in oil and gas production environments, including carbon steels, low alloys, and corrosion-resistant alloys. Material and Environmental […]

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  • 4.

    NACE MR0175: Difference between Pressure Containing and Pressure Retaining Parts

    ASME PTC 23 Pressure Containing Member: A component which is exposed to and contains pressure Pressure Retaining Member: A component which holds one or more pressure containing members together but is not exposed to the pressure. Various documents from API such API 16A, API 16AR, API Std 674 These API documents follow a very similar […]

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  • 5.

    What is the minimum partial pressure of H₂S that requires compliance with NACE MR0175?

    Minimum Partial Pressure of H₂S for NACE MR0175 Compliance NACE MR0175 is an international standard that specifies requirements for metallic materials in oil and gas production environments exposed to H₂S. Compliance with NACE MR0175 is based on the partial pressure of H₂S (ppH₂S) present in the environment. Compliance with NACE MR0175 According to ANSI/NACE MR0175/ISO […]

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  • 6.

    What are the NACE MR0175 material requirements for Inconel 625 (UNS N06625)?

    Sour Service Materials Made with Inconel 625 Must Comply with NACE Requirements 625 Inconel 625 (UNS N06625) is a popular material used in sour service applications in the oil and gas industry. However, to ensure its suitability for these environments, it must comply with the metallurgical requirements set out in ANSI/NACE MR0175/ISO15156, specifically NACE requirements […]

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  • 7.

    Hardness Requirements and Testing Methods in NACE MR0175

    Hardness Requirements for Materials Selection in NACE MR0175 This page aims to answer questions about the hardness requirements for materials selection in accordance with NACE MR0175. While the first section offers information on the limitations of using 22HRC as a hardness requirement, it also advises examining the specific material’s requirements for full compliance. OGC Energy […]

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  • 8.

    Is NACE MR0175 used only for sour service?

    NACE MR0175: Metallic Materials in Oil and Gas Production Environments NACE MR0175 is an international standard that outlines the requirements for metallic materials exposed to H₂S in oil and gas production environments. It is identical to ISO 15156, and ANSI/NACE MR0175/ISO 15156 lists the requirements for carbon steels, low alloys, and corrosion-resistant alloys exposed to […]

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  • 9.

    What are the NACE MR0175 requirements for ASTM A216 Grade WCB valves?

    ASTM A216 WCB Valves and NACE MR0175 Requirements ASTM A216 WCB valves are commonly used in hydrocarbon processing. When materials such as ASTM A216 WCB are exposed to H₂S, NACE MR0175 applies. Sour service requirements for ASTM A216 WCB are included in NACE MR0175. Understanding NACE MR0175 Requirements for ASME IX P1 Group 1 and […]

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  • 10.

    What is NACE MR0175 intent when it comes to H₂S partial pressure? operating or design pressure to be used in the calculations?

    Understanding Partial Pressure of H2S (ppH2S) for Carbon Steels, Low Alloy Steels, and Corrosion-Resistant Alloys This page provides information on the partial pressure of H2S (ppH2S) used to set the production environment limits for carbon steels, low alloy steels, and corrosion-resistant alloys in ANSI/NACE MR0175/ISO 15156. However, NACE MR0175 does not specify whether the user […]

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