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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

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 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.


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 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
           Material description and documentation
           Qualification based upon field experience
           Qualification based upon laboratory testing
                         Sampling of materials for laboratory testing
                         Selection of laboratory test methods
                         Conditions to be applied during testing
                         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
           Option 1 – Selection of SSC-resistant steels (and cast irons) using A.2
                         For pH2S < 0.3 kPa (0.05 psi)

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

                                 for ranges of sour service
                        Sulfide stress-cracking
                        SOHIC and SZC
          Hardness requirements
                        Parent metals
          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
           Evaluation of materials properties
                        Hardness of parent metals
                        Cracking-resistance properties of welds
                        Cracking-resistance properties associated with other fabrication methods
        5.3.7 Purchasing information and marking
         Information that should be supplied for material purchasing
         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 Exercises and Case Studies

8 End-of-Course Examination


Course Outline |Who Should Attend |Registration |In-House |On-Demand |Online Courses |PPT Slides+Testbank |Course List

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.


 Registration for This  Corrosion Course


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 In-House Training Corrosion Courses


If you are concerned with corrosion in your business, in-house training is a great solution to train a group of employees from design, production, operation, quality assurance, inspection and maintenance, and technical sales and support on corrosion control and corrosion prevention technology. The contents of all corrosion courses can be customized to fit your organization's needs.


There is no minimum or maximum number of participants required for in-house training corrosion courses. We conduct the in-house training corrosion course at your company's premises and at a time convenient to your company. Requests for in-house training corrosion courses from overseas countries are also welcome.


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 Corrosion Course-On-Demand


All our publicly scheduled corrosion short courses are conducted once a year. However, you do not need to wait for one year if you have missed any of the publicly scheduled corrosion courses as we have this unique corrosion course-on-demand scheme: we will conduct the course just for you on an one-on-one basis at a time and in a location convenient to you. This option costs significantly less than a full-scale in-house training program.


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 Online and Distance Learning Corrosion Courses

All corrosion courses can be conducted through online or distance learning. An username and password will be emailed to course participants for accessing the online course materials. Alternatively, a CD-ROM containing the same online course material or a master hard copy of corrosion course notes can be sent to your organization. Instructions, course assignments, discussions and questions related to the corrosion courses are posted on the website. Free email support for online courses is provided for a period up to 12 months. A Certificate of Completion will be issued to participants who pass the online test with a score of 70% and above.

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 PowerPoint Slides and Test Banks for Trainers, Instructors, Tutors, University Lecturers and Professors


If you are involved in teaching or training, you may wish to purchase a complete set of the trainer's package for this training course. The trainer's package comes complete with ready-to-use PowerPoint slides (fully editable) and test bank (with answer keys). These ready-to-use PowerPoint slides contain high quality color photographs, illustrations, animations, audio and video clips. The test bank contains questions in four categories: (1) true or false, (2) multiple choice, (3) calculation, and (4) reasoning and open-ended discussions. The trainer's package is suitable for in-house training and university teaching. This is exactly the same package that WebCorr uses to deliver our current training course.

The one-time lump sum fee allows your organization to use the training package and also modify it. For example, your organization may modify the course contents and re-name/re-brand the course under your organizationís name. WebCorr only retains the copyright of the original PowerPoint slides and test bank.


Click here to contact us if you need more information on the trainer's package.


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