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.

  • 201.

    What is NACE MR0175 definition of a Corrosion Resistant Alloy (CRA)?

    Question: I need your help with the definition of CRAs in Part 3 of MR0175/ISO 15156. The “corrosion-resistant alloys” is very general and does not specify whether or not the definition includes the Fe-based alloys or not. More than that, the term CRA is used together with “other alloys” making it even more confusing. Answer: […]

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  • 202.

    Who is responsible for certification of materials and equipment to NACE MR0175? The manufacturer or the user?

    At OGC Energy we frequently receive questions about the certification of materials and equipment to NACE MR0175. This is why we prepared a short webinar on the basics of certification to NACE MR0175 and how we are helping clients to solve some of these challenges. Certification of materials and equipment to NACE MR0175 from Ivan […]

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  • 203.

    Crude oil storage, does it have to comply with NACE MR0175?

    Question: Crude oil storage and handling facilities operating at a total absolute pressure below 0.45 MPa. My understanding of the above paragraph is that, it includes only dead oils with no gas in equilibrium. If any gas is in equilibrium with a crude (operating less than 0.45 MPa) which contains H2S more than 0.3kPa (in […]

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  • 204.

    Produced water handling facilities and NACE MR0175

    Question: Water handling facilities (less than 0.45 MPa) I really don’t know what does it mean? It means that the possibility of corrosion is low enough to be excluded from the standard requirements? Or the consequence of the problem is minimum? Can we conclude from the above paragraph that, low pressure water handling facilities, has no […]

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  • 205.

    Is ISO 9001/9002 required to supply NACE MR0175 equipment and material?

    Question: Some buyers in the U.S. are requesting equipment to ISO 15156, and then saying that the supplying company has to be ISO registered, i.e., has ISO 9002 in place (quality standard). As far as I know these are unrelated issues; a supplier to ISO 15156 does not have to be ISO 9002 registered. Can […]

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  • 206.

    Is there a NACE office available in Italy or in other European countries?

    Question: Is a NACE office available in Italy or in other European countries? All inquiries should be transmitted to the ISO Maintenance NACE Headquarters in Houston, Texas (Maintenance.Panel@nace.org). The Maintenance Panel has an international membership. Details of its current membership can be obtained from the above address. This question is in relation to NACE MR0175/ISO […]

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  • 207.

    What are the NACE MR0175 limits for Nitronic 50 (UNS S20910)?

    The NACE MR0175 received the inquiry shown below, if you need technical support on Nitronic 50 (UNS S20910) get in touch with us. Question: Our customer does not understand the NACE the same way as we do regarding the use of Nitronic 50 “hot worked” when applying Table A.3 (see document attached). It is only […]

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  • 208.

    What are the NACE MR0175 requirements for expansion joints and flexible hoses in austenitic stainless steel?

    Question: We’re a manufacturer of expansion joints and flexible hoses and since we get more and more often inquiries regarding bellow according to MR0175 we purchased a copy of this standard some time ago. Since our bellows standard material is austenitic stainless steel, we paid particular attention to Table A.2 (attached) where there some notes […]

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  • 209.

    Why does NACE MR0175 list S31600 and S31603 separately in part 3 Table A.2?

    Question:  Q1: Table A.2 lists material types and individual alloy UNS numbers. UNS S31600 and S31603 appear below the listing for “”Austenitic stainless steel from materials type described in A.2″” S31600 and S31603 comply with the requirements for material described in A.2 Why are S31600 and S31603 listed separately from the other austenitic stainless steels? […]

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  • 210.

    Does NACE MR0175/ISO 15156 require production casing to be sour service compliant?

    OGC Energy can help you select materials for tubing, casing and downhole components. We understand oilfield metallurgy and the role it plays in well integrity. Question: Does NACE MR0175/ISO 15156 require production casing to be sour service compliant if the containment string of tubing is a sour service grade and the bottom hole temperature (below […]

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