Gasunie Transport Services (GTS) operate the Dutch high pressure natural gas transmission system in the Netherlands of roughly 12,000 km, which is almost 60 years old. The demand of natural gas is decreasing, although there will remain a need for natural gas for the next decades. A backbone for transporting hydrogen is developed for the near and far future, where possible using former natural gas pipelines. Therefore, there is a need to determine how efficiently this transmission system can be operated for the near and far future. This requires balancing expenditures (CAPEX and OPEX) and risks of operating this transmission system. For this, GTS applies risk based asset management (RBAM). The goal of RBAM is to efficiently use resources (especially manpower and budget), prevent unacceptable high risks and prevent unacceptable high expenditures. So, there is a need to determine the monetized risk of gas transmission pipelines. This can be used to formulate policies for transmission pipelines in general and assess local bottlenecks. E.g., what is the risk of a pipeline section with low depth of cover or is corrosion acceptable and can it be managed efficiently. For this a pipeline risk model “LRM” has been developed, that calculates failure frequency and consequences and thereby risk for 12,000 km.

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