Is a Forged ASTM A105 Class 150# Flange in Non-Normalized Condition in Accordance with NACE MR0175 and NACE MR0103?

This page addresses a common question in the oil and gas industry. The answer is not straightforward, but we’ll do our best to explain. First, let’s define the terms:

• NACE MR0175: A standard that specifies the requirements for materials used in H₂S-containing environments in oil and gas production.
• NACE MR0103: A standard that specifies the requirements for materials used in CO₂-containing environments in oil and gas production.
• ASTM A105: A specification for carbon steel forgings for piping applications.
• Class 150#: A rating for flanges that indicates the maximum pressure they can withstand.

Now, to answer the question: The ISO 15156 Maintenance Panel can only provide an answer for NACE MR0175/ISO 15156, not for NACE MR0103. It further clarifies that “”AS FORGED”” is not an acceptable condition in A.2.1.2, and that both requirements of A.2.1.2 and A.2.1.3 of Part 2 must be fulfilled for ASTM A 105 flanges to meet NACE MR0175/ISO 15156.

If you need more information, ISO 15156 Maintenance Panel Inquiry #2009-08 is a useful reference for this question.

How OGC Energy Can Help You Comply with NACE MR0175 and NACE MR0103

At OGC Energy, we understand the importance of complying with industry standards like NACE MR0175 and NACE MR0103. That’s why we offer a team of oilfield metallurgists and corrosion consultants who can help you ensure that your materials are up to code. Contact us today to learn more.