I'm not aware of any active piping of petroleum over the Atlantic.
There were major pipelines built both on the American mainland (the Big Inch and Little Big Inch pipelines), due to an overwhelming toll of German Kriegsmarine U-Boat attacks on US domestic oil shipments (New Orleans to New Jersey, largely, Project Paukenschlag).
And there was Operation Pluto which ran a 9" pipeline across the English Channel, delivering fuel from Britain to the European mainland.
Trans-Atlantic oil shipments however were by tanker to the best of my knowledge.
I'm relying strongly on Daniel Yergin's account of the oil industry during WWII (along with WWI, an absolutely fascinating episode), covered in his 1990 book The Prize. Despite differing strongly with Yergin over the future of oil and the oil industry, I unreservedly recommend this book as a masterful history of its past.
Also, correcting my previous comment, Pluto was 2" and 3" pipes, not 9".
That is, the vast majority of oil used in Allied operations in Europe passed through a set of 2- and 3-inch pipes, with 17 laid in total per the Wikipedia article I'd linked earlier.
Which speaks both to the flow-rates achieved (~400,000 Imperial gallons/day), and the energy content of petroleum.
There were major pipelines built both on the American mainland (the Big Inch and Little Big Inch pipelines), due to an overwhelming toll of German Kriegsmarine U-Boat attacks on US domestic oil shipments (New Orleans to New Jersey, largely, Project Paukenschlag).
And there was Operation Pluto which ran a 9" pipeline across the English Channel, delivering fuel from Britain to the European mainland.
Trans-Atlantic oil shipments however were by tanker to the best of my knowledge.
I'm relying strongly on Daniel Yergin's account of the oil industry during WWII (along with WWI, an absolutely fascinating episode), covered in his 1990 book The Prize. Despite differing strongly with Yergin over the future of oil and the oil industry, I unreservedly recommend this book as a masterful history of its past.
<https://en.wikipedia.org/wiki/Big_Inch>
<https://en.wikipedia.org/wiki/Operation_Pluto>
<https://en.wikipedia.org/wiki/The_Prize:_The_Epic_Quest_for_...>