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Comments On Standards Development For Selection And Specification Of Subsea Materials

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In the oil and gas industry, the major standard for material selection today is ANSI1/NACE2 MR0175/ISO 15156 Parts 1-3. [1] While this standard deals extensively with environment cracking and its prevention for materials under exposure to production environments containing H2S, CO2, chlorides, and sulfur, it does not include any guidance or material requirements for resistance to environmental cracking (such as hydrogen stress cracking – HSC, or otherwise) under variable subsea conditions that involve exposure to seawater with varying levels of cathodic protection (CP). ISO 21457 [2] provides further guidance for materials selection and corrosion control for oil and gas production systems but does not provide adequate coverage of the issue of environmental cracking in subsea applications with CP.

Product Number: 51322-17491-SG
Author: Russell D. Kane
Publication Date: 2022
Industries: Coatings and Linings , Coatings
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In the oil and gas industry, the major standard for material selection today is ANSI1/NACE2 (now AMMP3) MR0175/ISO4 15156 Parts 1-3. This standard deal extensively with environmental cracking and its mitigation under exposure to sour production environments containing H2S, CO2, chlorides, and sulfur. Unfortunately, it does not include material requirements for resistance to environmental cracking under variable subsea applications and conditions that may involve exposure to seawater with or without cathodic protection (CP). Also, ISO 21457 and several other standards identify the corrosion mechanisms and parameters for evaluation when performing selection of materials for pipelines, piping and equipment related to hydrocarbon production, transport and processing, including utility and injection systems; however, they do not address in detail aspects of environmental cracking that can be associated with use of CP in subsea operations. This lack of attention in industry standards is somewhat surprising since exposure of materials to subsea conditions with cathodic protection and the potential for environmental cracking has been documented in the literature for over 50 years.

In the oil and gas industry, the major standard for material selection today is ANSI1/NACE2 (now AMMP3) MR0175/ISO4 15156 Parts 1-3. This standard deal extensively with environmental cracking and its mitigation under exposure to sour production environments containing H2S, CO2, chlorides, and sulfur. Unfortunately, it does not include material requirements for resistance to environmental cracking under variable subsea applications and conditions that may involve exposure to seawater with or without cathodic protection (CP). Also, ISO 21457 and several other standards identify the corrosion mechanisms and parameters for evaluation when performing selection of materials for pipelines, piping and equipment related to hydrocarbon production, transport and processing, including utility and injection systems; however, they do not address in detail aspects of environmental cracking that can be associated with use of CP in subsea operations. This lack of attention in industry standards is somewhat surprising since exposure of materials to subsea conditions with cathodic protection and the potential for environmental cracking has been documented in the literature for over 50 years.

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