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Wärtsilä 20 product guide - 150 Pages

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Catalogue excerpts

WÄRTSILÄ 20 PRODUCT GUIDE

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Product Guide Introduction Introduction This Product Guide provides data and system proposals for the early design phase of marine engine installations. For contracted projects specific instructions for planning the installation are always delivered. Any data and information herein is subject to revision without notice. This 1/2013 issue replaces all previous issues of the Wärtsilä 20 Project Guides. Issue Chapters Fuel Oil System and Lubrication Oil System updated with low sulphur operation, several other updates throughout the product guide. Chapters Technical Data and Lubricating Oil System...

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Product Guide Table of Contents Product Guide Wärtsilä 20 - 1/2013

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Product Guide Table of Contents 10.2 Product Guide Wärtsilä 20 - 1/2013

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Product Guide This page intentionally left blank Product Guide Wärtsilä 20 - 1/2013

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Product Guide 1. Main Data and Outputs Maximum continuous output Table 1.1 Rating table for Wärtsilä 20 Cylinder Main engines configuration 1000 rpm The mean effective pressure pe can be calculated as follows: where: Pe = Mean effective pressure [bar] P = Output per cylinder [kW] n = Engine speed [r/min] D = Cylinder diameter [mm] L = Length of piston stroke [mm] c = Operating cycle (4) Product Guide Wärtsilä 20 - 1/2013

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Product Guide 1. Main Data and Outputs Reference conditions The output is available up to a charge air coolant temperature of max. 38°C and an air temperature of max. 45°C. For higher temperatures, the output has to be reduced according to the formula stated in ISO 30461:2002 (E). The specific fuel oil consumption is stated in the chapter Technical data. The stated specific fuel oil consumption applies to engines without engine driven pumps, operating in ambient conditions according to ISO 15550:2002 (E). The ISO standard reference conditions are: total barometric pressure relative humidity charge...

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Product Guide 1. Main Data and Outputs Figure 1.1 Main engines (3V92E0068c) F1 for dry sump and F2 for deep wet sump Engine * Turbocharger at flywheel end Dimensions in mm. Weight in tons. Product Guide Wärtsilä 20 - 1/2013

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Product Guide 1. Main Data and Outputs Figure 1.2 Generating sets (3V58E0576d) * Dependent on generator type and size. Dimensions in mm. Weight in tons. Product Guide Wärtsilä 20 - 1/2013

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Product Guide 2. Operating Ranges Operating Ranges Engine operating range Below nominal speed the load must be limited according to the diagrams in this chapter in order to maintain engine operating parameters within acceptable limits. Operation in the shaded area is permitted only temporarily during transients. Minimum speed is indicated in the diagram, but project specific limitations may apply. 2.1.1 Controllable pitch propellers An automatic load control system is required to protect the engine from overload. The load control reduces the propeller pitch automatically, when a pre-programmed...

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Product Guide 2. Operating Ranges Loading conditions, weather conditions, ice conditions, fouling of hull, shallow water, and manoeuvring requirements must be carefully considered, when matching a fixed pitch propeller to the engine. The nominal propeller curve shown in the diagram must not be exceeded in service, except temporarily during acceleration and manoeuvring. A fixed pitch propeller for a free sailing ship is therefore dimensioned so that it absorbs max. 85% of the engine output at nominal engine speed during trial with loaded ship. Typically this corresponds to about 82% for the propeller...

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Product Guide 2. Operating Ranges maximum capability of the engine permits a more even temperature distribution in engine components during transients. The engine can be loaded immediately after start, provided that the engine is pre-heated to a HT-water temperature of 60…70ºC, and the lubricating oil temperature is min. 40 ºC. The ramp for normal loading applies to engines that have reached normal operating temperature. 2.2.1 Mechanical propulsion Figure 2.3 Maximum recommended load increase rates for variable speed engines The propulsion control must include automatic limitation of the load...

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Product Guide 2. Operating Ranges 2.2.2 Diesel electric propulsion and auxiliary engines Figure 2.4 Maximum recommended load increase rates for engines operating at nominal speed In diesel electric installations loading ramps are implemented both in the propulsion control and in the power management system, or in the engine speed control in case isochronous load sharing is applied. If a ramp without knee-point is used, it should not achieve 100% load in shorter time than the ramp in the figure. When the load sharing is based on speed droop, the load increase rate of a recently connected generator...

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Product Guide 2. Operating Ranges Operation at low load and idling The engine can be started, stopped and operated on heavy fuel under all operating conditions. Continuous operation on heavy fuel is preferred rather than changing over to diesel fuel at low load operation and manoeuvring. The following recommendations apply: Absolute idling (declutched main engine, disconnected generator) • Maximum 10 minutes if the engine is to be stopped after the idling. 3-5 minutes idling before stop is recommended. Maximum 6 hours if the engine is to be loaded after the idling. Operation below 20 % load on...

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Product Guide 3. Technical Data Technical Data Wärtsilä 4L20 Wärtsilä 4L20 Cylinder output Engine speed Engine output Mean effective pressure Combustion air system (Note 1) Flow at 100% load Temperature at turbocharger intake, max. Temperature after air cooler (TE601) Temperature after turbocharger, 100% load (TE517) Temperature after turbocharger, 85% load (TE517) Temperature after turbocharger, 75% load (TE517) Temperature after turbocharger, 50% load (TE517) Calculated pipe diameter for 35 m/s Jacket water, HT-circuit Pressure before injection pumps (PT101) Engine driven pump capacity (MDF...

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Product Guide 3. Technical Data Wärtsilä 4L20 Cylinder output Engine speed Pressure at engine, after pump, nom. (PT401) Pressure at engine, after pump, max. (PT401) Temperature before cylinder, approx. (TE401) Temperature after engine, nom. Capacity of engine driven pump, nom. Pressure drop over engine, total Pressure drop in external system, max. Water volume in engine Pressure from expansion tank Pressure at engine, after pump, nom. (PT451) Pressure at engine, after pump, max. (PT451) Temperature before engine, min...max Capacity of engine driven pump, nom. Pressure drop over charge air cooler Pressure...

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