1278516991595a1267106724867-brochure-o-wartsila-solutions-2015

LOW-SPEED ENGINESDefinitions and Notes for Low-Speed EnginesISO standard reference conditionsTotal barometric pressure at R1 ......................................1.0 barSuction air temperature ............................................25°CRelative humidity ............................................30%Cooling water temperature before engine .......................25°CRating points for Wärtsilä low-speed enginesThe engine layout fields forPowerWärtsilä low-speed enginesare defined by the power/speed rating points R1, R2,R3 and R4 (see diagram tothe right). In certain engines, R3the layout field is extended tothe points R1+ and R2+. R1,R4or R1+ instead if applicable,is the nominal maximumcontinuous rating (MCR).R4Any power and speed withinthe respective engine layoutfield may be selected as theContract-MCR (CMCR) point for an engine.Enginelayout fieldEngine-MCRR1 R1+SpeedDimensions and weights• All dimensions are in millimetres and are not binding.• Piston dismantling heights– F1: Min height for vertical removal– F2: Min height for vertical removal with double-jib crane– F3: Min height for tilted removal with double-jib crane• The engine weight is net in metric tonnes (t), without oil and water,and is not binding.Fuel consumptionAll brake specifi c fuel consumptions (BSFC) are quoted for fuel oflower calorific value 42.7 MJ/kg for liquid fuel and 50.0 MJ/kg for gasfuel, and for ISO standard reference conditions (ISO 15550 and 3046).For all Wärtsilä low-speed and dual-fuel engines stepwise toleranceshave been introduced for the brake specific fuel consumption (BSFC):• +5% tolerance for 100% to 85% engine load• +6% tolerance for 84% to 65% engine load• +7% tolerance for 64% to 50% engine loadR2R2+83