... TONNAGE NT=1255. (1) MAIN ENGINE type: 8DKM-28 Rated power 2500KW rated speed 750r/min (2) GEAR CASE type: GWC52 ... m, deep and slack sea ,shell clean without fouling ,the wind power not great than class 3 ,service speed not less than ... m, deep and slack sea ,shell clean without fouling ,the wind power not great than class 3 ,service speed not less than ...