Rautaruukki and Steel Finnpusku

pusher steel without barge in port of raahe. wärtsilä marine locomotive coupling devices visible in hull behind superstructure.



main articles: steel (pusher) , rautaruukki (pusher)

the pushers of finnpusku system 41.7 metres (136.8 ft) long , have breadth of 14.37 metres (47.1 ft) @ waterline , 15.5 metres (50.9 ft) @ bridge wings. draught , depth upper deck, 6.7 metres (22.0 ft) , 10 metres (32.8 ft) respectively, same of laden barge.

one of prominent features of pushers high superstructure rising 22 metres (72 ft) waterline. in addition accommodation, mess , dayroom crew of nine, housed 2 bridges @ different levels. lower bridge on third deck intended used when pusher operating on own without barge, allowing more comfortable conditions crew — chairs in upper bridge on seventh deck equipped seatbelts due large motions of vessel when operating independently. however, lower bridge used , space later rebuilt other use in both pushers. upper bridge, bridge wings extending beyond pusher s breadth, equipped allow 1 man bridge operation.

propulsion power provided 2 six-cylinder sulzer 6zal40 4-stroke medium-speed diesel engines running on heavy fuel oil, manufactured under licence wärtsilä, each maximum continuous output of 3,840 kw (5,150 hp) @ 380 rpm, giving combination service speed of 13.4 knots (24.8 km/h; 15.4 mph). lohmann & stolterfoht reduction gearbox connects main engines propeller shaft driving 4.7-metre (15.4 ft) four-bladed rauma-repola liaaen controllable-pitch propeller , 900 kva strömberg shaft generator used power bow thruster. main engines equipped steam-generating exhaust boilers improve overall efficiency of power plant. electricity provided 2 wärtsilä-vasa 4r22hf diesel engines, each producing 590 kw (791 hp) @ 1,000 rpm, connected 710 kva strömberg alternators. auxiliary generating sets mounted side side above propeller shaft due narrow hull. 158 kw volvo penta tmd102a emergency generator located on main deck level in smoke stack.

while connected barge, pushers capable of operating independently. however, low metacentric height of vessels, 0.5–0.6 m (1.6–2.0 ft), results in large roll amplitudes , pitching, making pushers uncomfortable in severe weather. reason short transit journeys without barge done when absolutely necessary.