I sailed on B.I.'s "Purnea" in 1970. She had a 3-legged Doxford, two Scotch boilers, all steam auxiliaries, main-engine driven lub. oil and cooling-water pumps. Ran like a dream when you got her settled down, but being single-handed watches you needed the 1-hour notice for arrival standby to get the steam driven pumps warmed through. I'm sorry I can't give you a lot more of the kind of detail you're looking for, but after almost 40 years, the old memory is not too reliable. But I'm sure a bit of judicious Googling will fill in some gaps.