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.
Acceptability of Austenitic and Duplex Stainless Steels in the As-Welded Condition in NACE MR0175/ISO 15156 Question: In NACE MR0175/ISO 15156, is it acceptable to use austenitic and duplex stainless steels in the as-welded condition, or is post weld heat treatment (PWHT) required? Answer: When it comes to cast austenitic and duplex stainless steels, Part 3 […]
NACE MR0175/ISO 15156-2 and NACE MR0175/ISO 15156-3 Questions and Answers Does NACE MR0175/ISO 15156-2, Paragraph A.2.2.4 Apply to Gr. 660 Flange Bolting Materials? The first question on this page addresses whether NACE MR0175/ISO 15156-2, Paragraph A.2.2.4 applies to Gr. 660 flange bolting materials or only to carbon and low alloy steel bolting materials in Part […]
Interpretation of Part 1 Clause 5 in Relation to Figure 1 of Part 2 This webpage provides an answer to a question about the interpretation of Part 1 Clause 5 in relation to the diagram in Figure 1 of Part 2. The question asks whether it is the equipment user’s responsibility to ensure that the […]
What Is Sour/Non-Sour Service in NACE MR0175/ISO 15156? This webpage provides an answer to a common question regarding the definition of sour/non-sour service in NACE MR0175/ISO 15156. The response clarifies that there is no defined “”non-sour”” limit, as steels can still be susceptible to cracking even below the limit of 0.05 psi (0.3 kPa). The […]
Does MR0175/ISO 15156-2, 7.3.2 Apply to Low-Alloy Martensitic Steels like CA6NM? This webpage provides an answer to the question of whether MR0175/ISO 15156-2, 7.3.2 is applicable to low-alloy martensitic steels like CA6NM, which is classified as a CRA (MR0175/ISO 15156-3). The Answer No, it does not apply to low-alloy martensitic steels like CA6NM. Additional information […]
Acceptability of Additional Indentations and Measurements on Weld Test Coupon This webpage discusses the acceptability of making additional indentations and measurements to the same area as the suspect indentation on a weld test coupon which failed the micro hardness test. While NACE MR0175 Part 2 Section 7.3 “”Hardness”” paragraph 7.3.2 allows additional hardness readings in […]
Acceptance Criteria for Location Points 17, 18, and 19 in Ref Part 2 Figure 2 Butt Weld Survey Method for Vickers Hardness Measurement This webpage provides a question about the acceptance criteria for location points 17, 18, and 19 in Ref Part 2 Figure 2 Butt Weld Survey method for Vickers Hardness Measurement. As Table […]
Clarifying PWHT Requirements for Carbon, Carbon-Manganese, and Low Alloy Steels This webpage features a question regarding the confusion surrounding post-weld heat treatment (PWHT) requirements for as-welded carbon steel, carbon-manganese steel, or low alloy steel that meets the hardness requirements of Table A.1 with only HRC hardness testing. PWHT Requirements for HRC Hardness Testing The answer […]
Understanding NACE MR0175/ISO 15156 Requirements for HIC Evaluation and Testing Standards Are you uncertain about the requirements of ANSI/NACE MR0175/ISO 15156 for evaluating the risk of Hydrogen Induced Cracking (HIC) and complying with NACE TM0284 testing standards for HIC resistance? OGC Energy can assist you in identifying if HIC testing is necessary and help you […]
Understanding ANSI/NACE MR0175/ISO 15156 Requirements for HIC Resistant Carbon and Low Alloy Steels If you’re looking to ensure your carbon steels and low alloy steels are HIC resistant, it’s important to understand the requirements of ANSI/NACE MR0175/ISO 15156. At OGC Energy, we have the expertise to assist you in confirming HIC resistance and meeting NACE […]
