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.
Specifically require solution annealing of welds if the base metals were already solution annealed and the filler metal used is of the E/ER316L type. However, it is important to consider the specific operating conditions, such as the high H₂S partial pressure and chloride content, which may increase the risk of sulfide stress cracking (SSC) and […]
Chloride Limits for UNS S31600 and UNS S31603 Question: What are the chloride limits for UNS S31600 and UNS S31603? Answer: The chloride column is marked as “”see remark”” in Table A.2 of NACE MR0175/ISO 15156-3. Any combination of chloride concentration and in situ pH occurring in production is acceptable. For example, Table A.2 indicates […]
Previous Editions of NACE MR0175 Showed Errors in Age Hardening Temperatures and Ranges for Precipitation Hardening Stainless Steels in NACE MR0175/ISO 15156-3 In previous editions of NACE MR0175, there are inconsistencies and errors in the age hardening temperatures and ranges for precipitation hardening stainless steels specified in NACE MR0175/ISO 15156-3 Tables A.27 to A.30. The […]
Understanding the Hardness Limit of Welding Consumables in NACE MR0175 The inquiry is regarding a statement in NACE MR0175, Part 3, Sect A.2.3, which states that the hardness of the weld metal should not exceed the maximum hardness limit of the respective alloy used for the welding consumable. Clarification on Maximum Hardness Limit of Respective […]
Can a WPS Qualified for a Butt Joint be Used for a Fillet Weld Joint According to NACE MR 0175? The inquiry asks whether a weld procedure specification (WPS) qualified for a butt joint with a hardness survey carried out according to NACE MR 0175 (7.3.3.3 Figure 2) can be used for a fillet weld […]
Understanding NACE MR0175 Part 2 Table A.3 Introduction Two important questions were recently asked regarding NACE MR0175 Part 2 Table A.3. The first question was about the definition of “”proprietary grade,”” which is referenced for three temperature ranges in Table A.3. The second question was about whether Table A.3 is limited to casing and tubing […]
PWHT NACE: Dealing with Minimum Post-weld Heat Treatment Temperature for Carbon and Low Alloy Steels Question 1: What Is the Minimum PWHT Temperature Requirement for Carbon and Low Alloy Steels as per NACE MR0175? ANSI/NACE MR0175/ISO 15156-2 in Clause A.2.1.4 specifies that the minimum PWHT temperature requirement is specific to low alloy steels and is […]
Hardness of SS-254SMO (Grade) S31254 (UNS Number) Used in Valve Components The inquiry is about the hardness of SS-254SMO (Grade) S31254 (UNS Number) used in valve components. The inquiry seeks to clarify whether NACE MR0175 specifies hardness requirements for this material and whether the maximum allowable hardness is 35 HRC as stated in NACE MR0103. […]
Clarifying the Discrepancy in Temperature Limits for Super Duplex Stainless Steel Materials in Oil and Gas Production Environments Introduction This article seeks to clarify the discrepancy in the temperature limit for using super duplex stainless steel materials in oil and gas production environments. According to NACE MR0175/ ISO 15156, super duplex stainless steel materials can […]
NACE Nitriding: Understanding Case Depth Measurement Criteria Introduction The question relates to NACE MR0175/ISO 15156-2:2015 A.2.1.5, which limits the maximum allowable case depth for nitriding to 0.006″”. However, NACE MR0175/ISO 15156 does not define case depth, and there are different ways to define it. This article aims to clarify the measurement criteria for case depth […]
