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10190 Corrosion Management in a Safety Case Regulatory Regime

Picture for 10190 Corrosion Management in a Safety Case Regulatory Regime
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Product Number: 51300-10190-SG
ISBN: 10190 2010 CP
Author: Peter T. Wilson and Oliver Susic
Publication Date: 2010
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Oil and gas plants in Victoria, Australia are subject to the Major Hazards Facilities Regulations administered by Victorian Work Cover Authority. A requirement of those regulations is the preparation of a safety case which documents a safety management system. There are no explicit regulatory requirements under the MHF regulations for asset integrity. However included in the regulations are requirements such as “the operator of a MHF must adopt control measures which eliminate or if it is not practical to eliminate, which reduce so far as is practicable, risk to health and safety”. The regulations provide for a goal-setting performance based regime under which the operator defines appropriate controls for safe operation, evaluates their adequacy for the facility and decides how to implement and maintain these controls in practice. This paper discusses an evidence based approach to corrosion management which “reduce risk to health and safety so far as is practicable” for a gas processing and liquids recovery plant including an offshore platform. The examples of modes of corrosion damage which require adequate “control measures” include CO2 corrosion, SCC of stainless steel in a severe marine environment and liquid metal embrittlement of aluminum alloys. The evidence is based on knowing the possible damage mechanisms and their dependence on process parameters. The “control measures” include appropriate alloy selection and fabrication to recognized standards, control and monitoring of key integrity determining parameters to confirm operation is within the design envelope and inspection where needed to confirm rates of damage accumulation.

Keywords: corrosion, process engineering, gas, liquids processing, risk, control measures
Oil and gas plants in Victoria, Australia are subject to the Major Hazards Facilities Regulations administered by Victorian Work Cover Authority. A requirement of those regulations is the preparation of a safety case which documents a safety management system. There are no explicit regulatory requirements under the MHF regulations for asset integrity. However included in the regulations are requirements such as “the operator of a MHF must adopt control measures which eliminate or if it is not practical to eliminate, which reduce so far as is practicable, risk to health and safety”. The regulations provide for a goal-setting performance based regime under which the operator defines appropriate controls for safe operation, evaluates their adequacy for the facility and decides how to implement and maintain these controls in practice. This paper discusses an evidence based approach to corrosion management which “reduce risk to health and safety so far as is practicable” for a gas processing and liquids recovery plant including an offshore platform. The examples of modes of corrosion damage which require adequate “control measures” include CO2 corrosion, SCC of stainless steel in a severe marine environment and liquid metal embrittlement of aluminum alloys. The evidence is based on knowing the possible damage mechanisms and their dependence on process parameters. The “control measures” include appropriate alloy selection and fabrication to recognized standards, control and monitoring of key integrity determining parameters to confirm operation is within the design envelope and inspection where needed to confirm rates of damage accumulation.

Keywords: corrosion, process engineering, gas, liquids processing, risk, control measures
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