Loc: Phoenix, Arizona - USA
That HAS to be a mistake.. either that, or he means that during the initial systems check process prior to its maiden voyage, it needs that.
If it DID need to be changed out that often during normal use, then on any standard voyage, I'd have to think they'd be going through potentially tens of thousands of gallons of oil on a normal tanker run... if not more.
Plus, shutting it down every two hours and draining and refilling the oil would result in ludicrous amounts of down-time every single day. Merely draining and refilling the oil from that engine could take longer than 2 hours.
.. That said, I think they should do a UOA of that 2-hour oil and send it in to Blackstone. I bet their analysis includes a comment like this:
_________________________ 2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 250,000mi 2014 Nissan Altima SL - 2.5 liter/CVT - 50,000mi
sure maybe the oil gets changed but perhaps that terminology is misused as the oil might get filtered and reconditioned by some separate unit and eventually comes back to the engine. but for the purpise thata cobsidered a "change"
perhaps it means oil take a 2hours to make it back to the engine aftet going through whatever cycle it has.
Maybe it circulates all the oil in the sump through the engine in two hours (seems slow but with a big enough sump anything is possible). Or fully filters/bypasses it? Or are these two stroke engines with enough lubricity in the heavy oil?
I was surprised to read that these engines use 30wt in the sump, I would have thought a heavier wt, given the scale of these engines. 50wt is injected at the top end, since they are two strokes. For an emergency stop compressed air is used to stop and then reverse the engine, before fuel is injected to run engine in reverse. Kinda cool I think, at least to a landlubber like me.
'03 Park Avenue '05 Park Avenue '07 Honda Accord '09 VStar 1300
All the ships I worked on had somewhere between 800 and 1,200 gallons of lube oil. Oil/Water separator, centrifugal filter and filter chest with bats that could be re-cleaned and re-used. Typical turn-over was on the order of all oil passing the filtration system about every 4 hours if turning max revs ... Total filtration was/is a statistical exercise as some oil get recrirc'd much quicker and some does not get off the bottom of the tank for a while (tanks are baffled for rough seas).
Oil changes depended on total steaming time vs at anchor time, and UOA done every 150 hours based on the control board meters. Oil samples were taken even en route and shipped to lab from next port of call. If lab said oil was getting depleted, it was changed dockside from a pumper truck at next contracted port of call, or home port - whichever came first.
Changing ships oil is not fun or cheap...
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.