I was foolish - i had too much oil knocking about, so i loaded the reactor a while back, without processing.
Its colder now.
Irritatingly, i cant work out where the air leak on the suction side of my mono is, however, even pumping feebly (although theyre self priming, they dont pump at all well with air in the flow), i managed to rid the reactor of the 80ltrs or so of sludge in the bottom of it.
One day im going to have a reactor with a load of those quick release couplings, that oily bits do, for adventures like this one. They would make coupling up emergency pumps / pipes etc. so much simpler (no spanners needed). Either that, or im going to fit some air line couplers, and just pressurise the whole thing!
(before the H&S crew get on the case, my reactor was a pressure vessel in its former life : )