FAQs

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? What is NACE piping? What is a NACE MR0175 compliant steel? Where is the definite list of NACE MR0175 compliant materials? NACE is the National Association of Corrosion Engineers, NACE publishes many documents related to corrosion control including NACE MR0175 which provides the requirements for metallic materials exposed to H2S in oil […]

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  • 2.

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

    What is the minimum partial pressure of H2S that requires compliance with NACE MR0175? What is the maximum ppm of H2S allowed without NACE MR0175? NACE MR0175 is an international standard that provides the requirements for metallic materials exposed to H2S in oil and gas production environments. In NACE MR0175, the presence of H2S is […]

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  • 3.

    What is sour service?

    What is sour service? Sour service is referred to exploration and production environments in oil and gas that have enough H2S that could cause cracking of metallic materials. H2S (hydrogen sulphide) H2S is a highly flammable, explosive gas, and can cause possible life-threatening situations if not properly handled. H2S is deadly even at very low […]

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  • 4.

    What is the difference between NACE MR0175 and NACE MR0103? Get an answer from our expert team!

    NACE MR0175 is an international standard that gives requirements and recommendations for the selection and qualification of metallic materials for service in equipment used in oil and gas production and in natural-gas sweetening plants in H2S-containing environments. NACE MR0103 establishes material requirements for resistance to SSC in sour petroleum refining and related processing environments containing […]

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  • 5.

    H2S partial pressure, design or operating conditions?

    Ivan Gutierrez discusses what conditions should be used for calculating H2S partial pressure when considering sour service. What is NACE MR0175 intent when it comes to H2S partial pressure? operating or design pressure to be used in the calculations? The partial pressure of H2S (ppH2S ) is used throughout ANSI/NACE MR0175/ISO 15156 to set the production […]

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  • 6.

    According to NACE MR0175, What are the hardness requirements and what hardness method should be used?

    What are the hardness requirements according to NACE MR0175? Is 22HRC enough to meet NACE MR0175? What method should be used to measure hardness? 22HRC is not the only NACE MR0175 requirement (see this link). 22HRC applies for some carbon and low alloy steels, but 22HRC is not the hardness limit for all materials. The conversion […]

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  • 7.

    What is the difference between pressure containing and pressure retaining parts? and how does NACE MR0175 apply?

    ANSI / NACE MR0175/ISO 15156 defines a pressure-containing part as follows: part whose failure to function as intended results in a release of retained fluid to the atmosphere EXAMPLES Valve bodies, bonnets and stems. NACE MR0175 does not provide an exhaustive list of “pressure containing parts”. Some users require a definite definition between pressure-containing parts and pressure-retaining parts. […]

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  • 8.

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

    Sour service material manufactured with Inconel 625 (UNS N06625) has to comply with ANSI/NACE MR0175/ISO 15156. NACE MR0175 provides the metallurgical requirements for Inconel 625. Metallurgical condition and hardness are two of those requirements discussed in this article. NACE MR0175 requires alloy 625 to be in the annealed condition. Some suppliers offer alloy 625 quenched […]

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  • 9.

    How to use NORSOK M-506 Edition 3: 2017 to calculate corrosion rate?

    How to use NORSOK M-506 Edition 3: 2017 for CO2 corrosion rate calculations? Norsok M506 is a recommended practice for calculation of corrosion rates in hydrocarbon production and process systems where the corrosive agent is CO2, the model is used in oil and gas industry. The model is fitted to much of the same lab […]

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  • 10.

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

    ASTM A216 WCB valves are widely used in hydrocarbon processing. NACE MR0175 is applicable when materials like ASTM A216 WCB are exposed to H2S. The sour service requirements for ASTM A216 WCB are included in NACE MR0175.. ASME IX P1 material is listed as acceptable in NACE MR0175, but this does not mean that the general […]

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