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.
Welding Procedures and Qualifications for NACE MR0175/ISO 15156 Compliance This page provides answers to inquiries related to welding procedures and qualifications to meet NACE MR0175/ISO 15156, Part 2, and NACE TM0177. Do I Need to Test Welding Procedures Qualified in Accordance with A.2.1.4 with NACE TM0177? The first question concerns the necessity of testing welding […]
Environmental and Materials Limits for Martensitic Stainless Steels Used as Compressor Components in NACE MR0175/ISO 15156-3, Table A.22 Introduction This page provides clarification on an inquiry regarding the interpretation of the Remarks on the maximum partial pressure requirement for H₂S in NACE MR0175/ISO 15156-3, Table A.22. The question concerns the acceptability of any combination of […]
Can HIP Materials Fulfill Sour Service Requirements According to NACE MR0175/ISO 15156-3? Introduction This page provides an answer to an inquiry regarding the use of HIP materials in valve components for sour service, which have been listed in Tables A.24 and A.33 of NACE MR0175/ISO 15156-3. The Inquiry The inquiry asks if these materials fulfill […]
What are Continuous Precipitates in NACE MR0175/ISO 15156-3? Introduction This page aims to provide guidance on the term “”continuous precipitates”” mentioned in Appendix A.7 of NACE MR0175/ISO 15156-3. The inquiry seeks clarification on what “”continuous”” means in the context of microstructure and whether there is any quantitative limit for precipitates. Background The laboratory has reported […]
Bourdon Tubes Categorization in NACE MR0175/ISO 15156 This page features a question regarding the categorization of Bourdon tubes in the latest version of NACE MR0175. The user seeks clarification on whether Bourdon tubes fall under “”Instrument tubing and associated compression fittings,…”” or “”Diaphragms, pressure measuring devices and pressure seals.”” Answer: Bourdon tubes are not explicitly […]
Interpretation of Hardness Requirements in NACE MR0175/ISO 15156 Introduction This page addresses a user’s query regarding the interpretation of hardness requirements in Section A.2 of Part 3, Table A.2 of NACE MR0175/ISO 15156. The user seeks clarification on the maximum Vickers (HV 10 or HV 5) or Rockwell (15N) value that can be used for […]
Can UNS S20910 be used in valve stems and choke valve stems? This page features a question regarding the use of UNS S20910 in the condition specified in Table A.3 for valve stems and choke valve stems. The answer provided confirms that choke valve stems are also included in Table A.3 since choke valves are […]
Can UNS S20910 be used in hot rolled or solution annealed and hot rolled conditions? Introduction This page presents a question regarding the use of UNS S20910 in the hot rolled or solution annealed and hot rolled conditions, as long as the hardness does not exceed 35 HRC, for applications specified in Table A.3 of […]
Is there a limit for cold work in austenitic stainless steels? The Question This page features a question regarding the presence of a limit for what is deemed as cold work in austenitic stainless steels, as several paragraphs in both NACE MR0175 and ISO 15156 state that materials are acceptable if they are free of […]
Is Overstressing Superaustenitic Stainless Steel and Ni-Based Alloy Valve Bodies during Hydrotesting Permissible under NACE MR0175/ISO 15156 Rules? Introduction This page features a question about whether the practice of slightly overstressing superaustenitic stainless steel and Ni-based alloy valve bodies during hydrotesting, which results in a cold deformation of 0.2-0.5%, is permissible under the rules of […]
