Convert from pipe [UK] to drum [metric, petroleum]

Unit Definition (pipe [UK])
The pipe [UK] like the butt, the pipe is a traditional unit of liquid volume generally equal to 2 hogsheads. In Britain it's more complicated, because traditional British hogsheads were of different sizes depending on what they contained. The British pipe was usually used as a wine measure, but even different types of wine had different size pipes.

Unit Definition (drum [metric, petroleum])
The drum [metric, petroleum] is a unit of volume sometimes used in the oil trade. In the metric world, drums of 200 liters, 205 liters, and 208 liters are in use as substitutes for the traditional size.