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.

  • 191.

    According to NACE MR0175, who is responsible to ensure sour service conditions are qualified?

    Question: As stated in Part 1 Clause 5: “Qualification, with respect to a particular mode of failure, for use in defined service conditions also qualifies a material for use under other service conditions that are equal to or less severe in all respects than the conditions for which qualification was carried out. ” The diagram […]

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  • 192.

    Equipment of a SAGD plant, is it covered by NACE MR0175?

    Question: Regarding Table 1 in NACE MR0175/ISO 15156-2 is it defined what field facilities and field processing plants include? Would this include a SAGD plant? Also, when using below 65 psi for exclusion does this stand true for all: liquid, vapour, or mixed streams, also in Table 1? Answer: SAGD plant is not specifically included in […]

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  • 193.

    According to NACE MR0175, compressive stress means exclusion or waiver?

    Question: MR0175 part 2, Table 1: Does the intent to only load in compression, regardless of resultant stresses, fulfill the requirement for exclusion? Answer: The exclusion applies to components loaded in compression. It does not apply to equipment, assemblies, or aggregate parts loaded in compression. However, due to part geometry, constraint, bending, friction, or other […]

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  • 194.

    What happens to equipment and material certified to old NACE MR0175 versions?

    Question: How should existing equipment affected by changing materials requirements in later editions of the standard be handled? Answer: By convention, a new version of the standard is not applied retrospectively to equipment built to the previous version of the standard valid at the time of equipment construction. New requirements in the latest version may […]

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  • 195.

    What does NACE MR0175 mean by “Qualification based upon field experience”?

      Question: Q1: I need some clarifications on the clause 8.2 of the MR0175/ISO 15156-1 (Qualification based upon field experience). “A material may be qualified by documented field experience”–”the duration of the documented field experience shall be at least two years. . . “ What kind of documentation is expected? We need to know exactly […]

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  • 196.

    Successful field service? No documentation? What does NACE MR0175 require?

    Question: When materials in an existing field are replaced, what criteria should be used? Paragraph 8.2 of ISO 15156-1 provides some criteria for qualification, but it is not clear what approach should be used for materials that have been in use with no problems, but documentation does not exist. Answer: NACE MR0175/ISO 15156-1 Paragraphs 6.2, […]

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  • 197.

    What are the NACE MR0175 requirements for C95800, C95400, C95500 and C63200?

    Question: We are using the following materials for manufacturing of valve components. In reference to the clause A.12.1 of NACE MR0175/ISO 15156-3:2003, no any special requirements are specified to these materials for use in SOUR environment. We wish to know what shall be the chemical, physical, hardness properties and heat treatment requirements for using these […]

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  • 198.

    NACE MR0175 and elastic or plastic design criteria

      The question below was submitted to NACE MR0175 maintenance panel. At Oil & Gas Corrosion we can help you with materials selection to comply with NACE MR0175. Question: Unfortunately answer #2011-08 left my organization at a loss. This answer does not address the fact that NACE MR0175-ISO 15156-1, Clause 5 states: This part of ANSI/NACE […]

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  • 199.

    How can used and old equipment be certified to NACE MR0175?

    Question: My customer has some swab tanks that were manufactured in 1953; they are made of rolled 1/2-inch plate A283C; the tank is 84 in. in diameter and is rated for 100-psi service. The question is given the following conditions does this tank meet NACE MR0175? According to Section A2.1.6 the requirement that all rolled […]

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  • 200.

    Are metal rupture discs outside of the scope of NACE MR0175-ISO 15156?

    Question: Using NACE MR0175-ISO 15156-1, Clause 5, Paragraph 9 and NACE Interpretation MP INQUIRY #2009-05 Part 1 as references. Based on the fact that most metal rupture discs are plastically deformed during manufacturing and all metal rupture discs plastically deform when they burst, are metal rupture discs outside of the scope of NACE MR0175-ISO 15156? Answer: […]

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