Are y'all saying that these are turbos for the engines that power the pumps, or that they are the pumps themselves? If the latter, then what powers the turbine?
I could see compressor like pumps that are driven by some sort of motor or engine, along the lines of a centrifical supercharger, but it would seem very inefficient to blow a fluid thru a turbine to turn a compressor (pump) unless you had a readily available source of pressurized air (like engine exhaust).
Maybe that isn't a turbine behind the compressor. But doesn't that look kind of like big cylinder heads that the supports are hooked to?
I certainly don't know the answers, but I am curious as to the rest of the story on some of the suggestions.
Tom