Oh, for the love of units! A barrel is a unit of volume, and a metric tonne is a unit of weight. However, as given in Wikipedia for oil purposes, an approximate conversion is 1 tonne = 7.33 bbls. At 20 degrees API oil, the conversion is 1 tonne = 6.74 bbls and at 40 degrees, it would be 7.63 bbls. I used 1 tonne = 2204.6 pounds and the density of water = 62.4 lb/cu ft.
In making calculations for Deepwater Horizon, I think 1 tonne = 7.33 bbl is adequate.
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