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Gross and Net volumes spilled are actually showing downwards trends over time, even in the face of ever increasing average age of the pipeline system. This trend is actually somewhat reassuring. Additionally, when viewed in the context of the total amount of liquids transported by pipeline each year, the total amount spilled each year has been a very low percentage.
Gross Spilled is ~2.4m barrels over the ~20 year period. The estimate for the Deepwater Horizon spill is 4.9m barrels over 87 days. The Net Barrels Lost reduces to ~1.4 million barrels over the period. Gross and Net volumes spilled show a downtrend despite increasing average age of the pipeline system. When viewed in the context of the total amount of liquids transported by pipeline, the total amount spilled each year has been a very low percentage.
Gas Transmission + Gas Gathering pipelines are ~20% of the reportable incidents and ~32% of the property damage (includes mainly the regulated offshore gathering systems). This makes intuitive sense, since natural gas is in a gaseous state in the pipeline if there is a leak, like a hard to detect pinhole leak, and the natural gas does not get ignited, it will tend to dissipate into the atmosphere. This is also why mercaptan is added to natural gas to make that recognizable rotten egg smell.