At OGC Energy we help the energy industry with finding answers to some of their most difficult questions. We have created this section hoping that you will find answers to some of the most common questions in the following areas:
If you require technical support in metallurgy, corrosion, or welding; or if you need assistance meeting the requirements of ANSI/NACE MR0175/ISO 15156 then contact our team, we are here to help you.
Understanding NACE MR0175 Hardness Requirements for Round Bar Stock 304/316 SS Material Introduction This page features a Q&A section that addresses the NACE MR0175 hardness requirement for round bar stock 304/316 SS material, and whether the Rockwell C 22 max hardness refers to the hardness anywhere on the raw material or at mid-radius, where ASTM […]
Question: What is the status of alloys S20100, S20200, and S20500 in NACE MR0175/ISO 15156-3 Table A.2? Answer: Alloys S20100, S20200, and S20500 do not meet the requirements of A.2 and are therefore not covered by the ISO 15156-3 austenitic stainless steel limit tables. Annex D in the standard is included for information purposes only […]
Application of a 10-Inch Pipeline for Natural Gas Containing H₂S This page features a question from a user concerning the application of a 10-inch pipeline, which carries natural gas containing 250 ppm by volume of H₂S and is pressurized to 475 psi at 152°F. The pipeline runs from a gas compressor to a turbine generator, […]
Does the requirement for solution-annealing and quenching apply to fabricated parts? This page presents a question related to NACE MR0175/ISO 15156-3 Table A.2 and A.6, which state that the materials shall be in the solution-annealed and quenched condition. The user seeks clarification on whether this requirement applies to fabricated parts. The answer: The requirement for […]
Maximum Acceptable Hardness Values for Stress-Relieved Weldments in NACE MR0175/ISO 15156-2 Overview This page addresses a common question regarding the maximum acceptable hardness values for stress-relieved weldments in NACE MR0175/ISO 15156-2. Specifically, the question asks whether Table A.1 should be applicable for stress-relieved weldments, as it does not specifically refer to it. The question also […]
Interpretation of ISO 15156-2 Subclause A2.1.4 Welding Can Weldments with Ni Content Exceeding 1% be Accepted? If you’re wondering whether weldments with a Ni content exceeding 1% mass fraction can be accepted if the weld procedures pass SSC qualification testing or if they must be stress-relieved at a minimum temperature of 620°C after welding with […]
Can Metallic Coatings Prevent SSC in Accordance with ANSI/NACE MR0175/ISO 15156-2? Introduction This page addresses a common question regarding the acceptance of metallic coatings, such as electroless nickel plating, for preventing SSC in accordance with ANSI/NACE MR0175/ISO 15156-2, Section A.2.1.5, Surface Treatments, Overlays, Plating, Coatings, Linings, etc. Background The question asks if the qualification of […]
NACE MR0175 – Carburizing as Surface Treatment Q1: For NACE MR0175 compliant products, is carburizing an acceptable surface treatment process? A1: Currently, carburizing is not permitted in ISO 15156, except in specific cases mentioned in Table 1 of ISO 15156-2. These exceptions are related to certain equipment subjected to compressive loading or equipment that falls […]
Designation of C110 Grade Steel in Mild Sour Service Conditions Introduction This page addresses a common question regarding the designation of C110 grade steel in mild sour service conditions in accordance with NACE MR0175/ISO15156. The question asks about the steel’s qualification and region placement based on the temperature constraints in Table A.3 of Section A.2.2.3 […]
Is Nitro-Carburizing an Acceptable Surface Treatment for NACE MR0175 Compliance? This page addresses a common question in the oil and gas industry regarding the acceptability of nitro-carburizing as a surface treatment for materials selection compliance with NACE MR0175/ISO 15156-3 Annex A.1.5.1. Surface Treatment Requirements for NACE MR0175 Compliance As of now, acceptable surface treatment has […]
