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Wärtsilä 50DF product guide - 182 Pages

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Catalogue excerpts

WÄRTSILÄ 50DF 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 1/2012 issue replaces all previous issues of the Wärtsilä 50DF Project Guides. Issue Minor updates throughout the product guide Product Guide attachments updated, DXF-files are now available (InfoBoard only) Several updates throughout the product guide Chapters Technical data,...

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Product Guide Table of Contents Product Guide Wärtsilä 50DF - 1/2012

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Product Guide Table of Contents Product Guide Wärtsilä 50DF - 1/2012

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Product Guide Table of Contents 21.1 21.2 Product Guide Wärtsilä 50DF - 1/2012

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Product Guide 1. Main Data and Outputs Maximum continuous output Table 1.1 Rating table for Wärtsilä 50DF Cylinder configuration Diesel electric applications 500 rpm Nominal speed 514 rpm is recommended for mechanical propulsion engines. The mean effective pressure Pe can be calculated using the following formula: 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 50DF - 1/2012

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Product Guide 1. Main Data and Outputs Derating of output in gas mode 1.2.1 Derating due to methane number Figure 1.1 Derating factor due to methane number Notes: Compensating a low methane number gas by lowering the receiver temperature below 45°C is not allowed. Compensating a higher charge air temperature than 45°C by a high methane number gas is not allowed. The engine can be optimized for a lower methane number but that will affect the performance. The dew point shall be calculated for the specific site conditions. The minimum charge air temperature shall be above the dew point, otherwise...

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Product Guide 1. Main Data and Outputs 1.2.2 Derating due to gas feed pressure and lower heating value Figure 1.2 Derating due to gas feed pressure / LHV Notes: The above given values for gas feed pressure (absolute pressure) are at engine inlet. The pressure drop over the gas valve unit (GVU) is approx. 80 kPa. No compensation (uprating) of the engine output is allowed, neither for gas feed pressure higher than required in the graph above nor lower heating value above 36 MJ/m3N . Product Guide Wärtsilä 50DF - 1/2012

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Product Guide 1. Main Data and Outputs Reference conditions The output is available within a range of ambient conditions and coolant temperatures specified in the chapter Technical Data. The required fuel quality for maximum output is specified in the section Fuel characteristics. For ambient conditions or fuel qualities outside the specification, the output may have to be reduced. The specific fuel consumption is stated in the chapter Technical Data. The statement applies to engines operating in ambient conditions according to ISO 3046-1:2002 (E). total barometric pressure relative humidity charge...

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Product Guide 1. Main Data and Outputs Figure 1.3 In-line engines (DAAE000316d) * TC in driving end All dimensions in mm. Weights are dry engines, in metric tons, of rigidly mounted engines without flywheel. Product Guide Wärtsilä 50DF - 1/2012

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Product Guide 1. Main Data and Outputs * TC in driving end ** With monospex (exhaust manifold) Δ With air suction branches All dimensions in mm. Weights are dry engines, in metric tons, of rigidly mounted engines without flywheel. Product Guide Wärtsilä 50DF - 1/2012

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Product Guide 1. Main Data and Outputs Figure 1.5 Example of total installation lengths, in-line engines (DAAE000489) Figure 1.6 Example of total installation lengths, V-engines (DAAE000489) Values are indicative only and are based on Wärtsilä 50DF engine with built-on pumps and turbocharger at free end of the engine. Generator make and type will effect width, length, height and weight. [All dimensions are in mm] Product Guide Wärtsilä 50DF - 1/2012

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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 capacity Controlled load increase is essential for highly supercharged engines, because the turbocharger needs time to accelerate before it can deliver the required amount of air. Sufficient time to achieve even temperature distribution in engine components must also be ensured. Dual fuel engines operating in gas mode require precise control of the air/fuel ratio, which makes controlled load increase absolutely decisive for proper operation on gas fuel. The loading ramp “preheated, normal gas” (see figures) can be used as the default loading rate for both...

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Product Guide 2. Operating Ranges 2.2.2 Electric propulsion Figure 2.3 Maximum load increase rates for engines operating at nominal speed The propulsion control and the power management system must not permit faster load reduction than 20 s from 100% to 0% without automatic transfer to diesel first. In electric propulsion applications 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. When the load sharing is based on speed droop, it must be taken into account that the load...

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Figure 2.4 Maximum instant load steps in % of MCR in gas mode Initial load level (%) When performing the electric load analysis for the vessel in various operating conditions, evaluate possible scenarios that cause sudden load changes and check against the engine capacity in gas mode as shown in the diagram. Maximum step-wise load increases according to figure Steady-state frequency band < 1.5 % Maximum speed drop 10 % Time between load steps > 30 s Maximum step-wise load reductions: 100-75-45-0% Maximum step-wise load increase 33% of MCR Steady-state frequency band < 1.0 % Maximum speed drop...

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