API 5CT proprietary grades and NACE MR0175
Understanding NACE MR0175 Part 2 Table A.3
Introduction
Two important questions were recently asked regarding NACE MR0175 Part 2 Table A.3. The first question was about the definition of “”proprietary grade,”” which is referenced for three temperature ranges in Table A.3. The second question was about whether Table A.3 is limited to casing and tubing or also includes tubular components.
Answering the First Question
The response to the first question is that NACE MR0175/ISO 15156-2 doesn’t define “”proprietary grade.”” Instead, Table A.3 defines it and references clauses A.2.2.3.2 and A.2.2.3.3. This means that the definition of “”proprietary grade”” can be found in Table A.3, and the referenced clauses provide additional information.
Answering the Second Question
In response to the second question, the identified table applies to tubular components, including casing and tubing noted in the column for temperatures less than 65°C (150°F), as well as referenced clauses A.2.2.3.2 and A.2.2.3.3. This means that Table A.3 is not limited to casing and tubing, but also includes other tubular components.
Conclusion
If you require assistance with the NACE MR0175 requirements for proprietary grades or material selection for tubulars, you can consult a team of oilfield metallurgists. The reference code for the inquiry is MP inquiry 2017-12 NACE MR0175 Part 2 A.3.