FAQ's

API 5CT proprietary grades and NACE MR0175

 

Q1. NACE MR0175 Part 2 Table A.3 references “Proprietary Grades” for three temperature ranges. There is no definition of “proprietary grades” in NACE MR0175. However, this suggests that not all materials will be adequate despite meeting the Table A.3 mechanical / product form requirements. Is there an accepted definition of “proprietary grade”?
Q2. Table A.3 is entitled “Environmental conditions for which grades of casing and tubing are acceptable”. A.2.2.3.1 refers to Table A.3 in the context of ISO 11960 and API 5CT grades. Other sections of A.2.2.3, not directly referencing table A.3, refer to tubular components as well as casing and tubing. Is Table A.3 restricted to Casing and Tubing?
Q1. NACE MR0175 Part 2 Table A.3 references “Proprietary Grades” for three temperature ranges. There is no definition of “proprietary grades” in NACE MR0175. However, this suggests that not all materials will be adequate despite meeting the Table A.3 mechanical / product form requirements. Is there an accepted definition of “proprietary grade”?

A1: Proprietary grade as a term does not have a definition in NACE MR0175/ISO 15156-2. NACE MR0175/ISO 15156-2 Table A.3 defines what constitutes the proprietary grades and specifically references clauses A.2.2.3.2 and A.2.2.3.3.

Q2. Table A.3 is entitled “Environmental conditions for which grades of casing and tubing are acceptable”. A.2.2.3.1 refers to Table A.3 in the context of ISO 11960 and API 5CT grades. Other sections of A.2.2.3, not directly referencing table A.3, refer to tubular components as well as casing and tubing. Is Table A.3 restricted to Casing and Tubing?

A2: NACE MR0175/ISO 15156-2 Table A.3 is restricted to tubular components including casing and tubing. Tubulars are noted in the column for temperatures less than 65°C (150°F) and well as the referenced clauses A.2.2.3.2 and A.2.2.3.3.

Reference MP inquiry 2017-12 NACE MR0175 Part 2 A.3

If you require assistance with the NACE MR0175 requirements for proprietary grades; or if you are considering the use o proprietary grades, talk to our team of oilfield metallurgist to discuss the material selection for your tubulars.

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