Corrosion Short Courses: Understanding NACE MR0175 / ISO 15156: Petroleum and Natural Gas Industries - Materials for use in H2S-containing Environments in Oil and Gas Production. NACE MR0175, ISO 15156, H2S services, H2S environment, oil and gas production, materials selection, crack-resistant materials

Understanding NACE MR0175 / ISO 15156 (4th Edition, November 2020)
Petroleum and Natural Gas Industries – Materials for Use in H₂S-containing Environments in Oil and Gas Production

Course Overview

The 4th edition (November 2020) of BS EN ISO 15156 (also known as ANSI/NACE MR0175) - "Petroleum and natural gas industries – Materials for use in H2S-containing environments in oil and gas production" is the latest standard that updates the 3rd edition released in 2015.

The 2020 edition gives requirements and recommendations for the selection and qualification of cast irons, carbon steels, low-alloy steels, stainless steels, and other corrosion-resistant alloys for service in equipment used in oil and natural gas production and natural gas treatment plants in H2S-containing environments. The failure of these equipment could pose a potential risk to the health and safety of the public and personnel or to the environment. The selection of crack-resistant materials for use in H2S-containing environments has had a significant impact on various aspects of the oil and gas industry worldwide.

This 3-day course aims to help participants understand the various requirements and to provide guidance and assistance on how to comply to the BS EN ISO 15156 (ANSI/NACE MR0175) standard. Case studies will be presented for group exercise and discussions.

This course is available for in-house training, on-demand, on-ZOOM/Webex, online and distance learning worldwide. It can also be customized to meet the specific needs of your company.

Course Outline

1 Objective
2 Background and Structure of BS EN ISO 15156:2020
3 BS EN ISO 15156 /NACE MR0175 Interpretation and Maintenance
4 What's New in the 4th Edition (November 2020) of BS EN ISO 15156 / NACE MR0175
5 Understanding BS EN ISO 15156:2020
   5.1 ISO 15156-1:2020 Part 1 - General Principles for Selection of Cracking-Resistant Materials
          5.1.1 Scope
          5.1.2 Normative references
          5.1.3 Terms and definitions
          5.1.4 Abbreviated terms
          5.1.5 General principles
          5.1.6 Evaluation and definition of service conditions to enable material selection
          5.1.7 Selection of materials resistant to SSC/SCC in the presence of sulfides

                    from existing lists and tables
          5.1.8 Qualification of materials for H2S service
                    5.1.8.1 Material description and documentation
                    5.1.8.2 Qualification based upon field experience
                    5.1.8.3 Qualification based upon laboratory testing
                                  5.1.8.3.1 General
                                  5.1.8.3.2 Sampling of materials for laboratory testing
                                  5.1.8.3.3 Selection of laboratory test methods
                                  5.1.8.3.4 Conditions to be applied during testing
                                  5.1.8.3.5 Acceptance criteria
          5.1.9 Report of the method of selection or qualification

   5.2 ISO 15156-2:2020 Part 2: Cracking-resistant carbon and low alloy steels, and the use of cast irons
          5.2.1 Scope
          5.2.2 Normative references
          5.2.3 Terms and definitions
          5.2.4 Symbols and abbreviated terms
          5.2.5 Purchasing information
          5.2.6 Factors affecting the behaviour of carbon and low alloy steels in H2Scontaining environments
          5.2.7 Qualification and selection of carbon and low-alloy steels with resistance to SSC, SOHIC and SZC
                    5.2.7.1 Option 1 – Selection of SSC-resistant steels (and cast irons) using A.2
                                  5.2.7.1.1 For pH2S < 0.3 kPa (0.05 psi)

5.2.7.1.2 For pH2S ≥ 0.3 kPa (0.05 psi)
5.2.7.2 Option 2 – Selection of steels for specific sour-service applications or

                                 for ranges of sour service
                                 5.2.7.2.1 Sulfide stress-cracking
                                 5.2.7.2.2 SOHIC and SZC
                   5.2.7.3 Hardness requirements
                                 5.2.7.3.1 General
                                 5.2.7.3.2 Parent metals
                                 5.2.7.3.3 Welds
                   5.2.7.4 Other fabrication methods
        5.2.8 Evaluation of carbon and low alloy steels for their resistance to HIC/SWC
        5.2.9 Marking, labelling, and documentation
        Annex A (normative) SSC-resistant carbon and low alloy steels (and requirements and

recommendations for the use of cast irons)
Annex B (normative) Qualification of carbon and low-alloy steels for H2S service by

                      laboratory testing
        Annex C (informative) Determination of H2S partial pressure and use of alternative parameters
        Annex D (informative) Recommendations for determining pH
        Annex E (informative) Information that should be supplied for material purchasing

   5.3 ISO 15156-3:2020 Part 3: Cracking-resistant CRAs (corrosion-resistant alloys) and other alloys
          5.3.1 Scope
          5.3.2 Normative references
          5.3.3 Terms and definitions
          5.3.4 Symbols and abbreviated terms
          5.3.5 Factors affecting the cracking-resistance of CRAs and other alloys

in H2S-containing environments
5.3.6 Qualification and selection of CRAs and other alloys with respect to SSC, SCC, and

                    GHSC in H2S-containing environments
                    5.3.6.1 General
                    5.3.6.2 Evaluation of materials properties
                                 5.3.6.2.1 Hardness of parent metals
                                 5.3.6.2.2 Cracking-resistance properties of welds
                                 5.3.6.2.3 Cracking-resistance properties associated with other fabrication methods
                   5.3.6.3 PREN
        5.3.7 Purchasing information and marking
                  5.3.7.1 Information that should be supplied for material purchasing
                  5.3.7.2 Marking, labeling, and documentation
        Annex A (normative) Environmental cracking-resistant CRAs and other alloys (including
                                Table A.1-Guidance on the use of the materials selection tables)
        Annex B (normative) Qualification of CRAs for H2S-service by laboratory testing
        Annex C (informative) Information that should be supplied for material purchasing
        Annex D (informative) Nominated sets of test conditions
6 End User's Application Guideline for MR0175/ISO 15156

7 Software Tools for Corrosion Modeling and Prediction

7.1 ISO15156-Compass®: Modeling and Prediction of in-situ pH, Region of Environmental Severity, and Susceptibility to Sulfide Stress Cracking (SSC) of Carbon and Low Alloy Steels
7.2 GC-Compass®: A Software Tool for Galvanic Corrosion Prediction and Materials Compatibility Assessment

7.3 CRA-Compass®: Corrosion Modeling and Corrosion Prediction for Corrosion Resistant Alloys

8 Exercises and Case Studies

9 End-of-Course Examination

Who Should Attend

Designers and engineers who are involved in the selection and evaluation of materials for use in H2S-containing environments in oil and gas production.

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