What Is NACE Bolting?

NACE bolting refers to bolts that meet the requirements of NACE MR0175, an international standard that outlines the specifications for metallic materials that are exposed to H₂S in oil and gas production environments. This standard is identical to ISO 15156, and ANSI/NACE MR0175/ISO 15156 lists the requirements for carbon steels, low alloys, and corrosion-resistant alloys that are exposed to H₂S in oil and gas exploration and production environments.

Ensuring Compliance with NACE MR0175

Determining whether a bolt is compliant with NACE MR0175 can be confusing, especially when it comes to bolts like flange bolts that may not be in direct contact with transport fluids. However, a leak can expose them to H₂S. NACE MR0175/ISO 15156-2 Section A.2.2.4 addresses this matter by stating, “”Bolting that can be exposed directly to a sour environment, or that is buried, insulated, equipped with flange protectors or otherwise denied direct atmospheric exposure or direct open seawater exposure, shall conform to the general requirements of A.2.1.””

How Our Metallurgists Can Help

Our team of metallurgists can assist you in selecting the correct bolting material for your project while ensuring compliance with NACE MR0175. Contact us today to discover how we can assist you.