14-05-2014, 04:56 PM
Diesel Locomotive Works
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INTRODUCTION TO D.L.W
Diesel Locomotive Works (DLW) is production unit under the ministry of railways. This was setup in collaboration with American locomotive company (ALCO) USA in 1961 and the first locomotive was rolled out in 1964. This unit produces diesel electronic locomotives for Indian railways and other customers in India and Abroad.
Subsequently a contract for transfer of technology of 4000 HP Microprocessor Controlled AC/AC Freight (GT 46 MAC) / passenger (GT 46 PAC) locomotives and family of 710 engines has been signed with electro motive division of general motors of USA for manufacture in DLW. The production of these locomotives has now started and thus DLW is the only manufacturers of Diesel Electric Locomotives with both ALCO and General motors technologies in the world.
INTRODUCTION TO LOCOMOTIVE
A diesel engine can be either two-stroke or four-stroke and, except for its ignition, is much like any other internal combustion engine. It is one of three types- V, vertical in-line, or horizontal (depending on the arrangement of its cylinders).
The fuel system includes the fuel tank, fuel and ignition pumps, filters, injection nozzle, and emergency fuel cut-off valve. The fuel tank has baffle plates to prevent surging and a pit to catch sediment so that it can be drained out. In some locomotives, the fuel tank is above the pump and fuel enters the pump by gravity. In others, fuel is pumped from the tank into the main pump by an auxiliary pump. The fuel pump creates the injection pressure and determines the amount of fuel injected into the cylinders by the injectors.
In an engine with a water-cooling system, water is run through water jackets between the cylinders and cylinder liners. The water is directed through a radiator to cool it. Louvers on the front of the radiator can be opened and closed to regulate the heat escaping from it. Occasionally, an engine is designed so that the pistons are cooled also by their lubricating oil. When this is done, a special oil radiator, with its own cooling fan, is provided in addition to the water cooling radiator.
Lubricating oil should have some detergent properties so that contaminating materials can be kept in suspension and filtered out by strainers, made of gauze, steel wool, or closely spaced plates.
Brief History
Set up in 1961 as a green-field project in technical collaboration with ALCO/USA to Manufacture Diesel Electric Locomotives.
First locomotive rolled out and dedicated to nation in January,1964.
Transfer-of-Technology agreement signed with General Motors/ USA in October,95 to manufacture state-of-the-art high traction AC-AC diesel locomotives.
A flagship company of Indian Railways offering complete range of flanking products in its area of operation.
Classification of Indian locomotives-
• In India, locomotives are classified according to their track gauge, motive power, the work they are suited for and their power or model number.
• The class name includes this information about the locomotive.
• It comprises 4 or 5 letters.
• The first letter denotes the track gauge.
• The second letter denotes their motive power (Diesel or Electric).
• The third letter denotes the kind of traffic they are suited for(goods, passenger, mixed or shunting).
• The fourth letter used to denote locomotives' chronological model number.
• However, from 2002 a new classification scheme has been adopted. Under this system, for newer diesel locomotives, the fourth letter will denote their horsepower range.
Arc welding
Arc welding is a type of welding that uses a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. They can use either direct (DC) or alternating (AC) current, and consumable or non-consumable electrodes. The welding region is usually protected by some type of shielding gas, vapor, and/or slag.
Engine testing
Engine Testing is a unique, well-organized and comprehensive collection of the different aspects of engine and vehicle testing equipment and infrastructure for anyone involved in facility design and management, physical testing and the maintenance, upgrading and trouble shooting of testing equipment.
LOCOMOTIVE TESTING SHOP
It is the shop where the final testing of the engine is performed before the engine is dispatched for use by the Indian railways. The important electrical in spections and tests performed are :
FIR Impulse Insulation Registering (IR)High Potential Test Battery Connection Digital I/O checking (for microprocessor control unit)Fuel pressure adjustment Engine Cranking Auxiliary Generator Check AC Voltage Check Temperature switch check Load cable connection and load test Loco Normalisation test (In which load cable is disconnected)Traction Motor boot application DM Boot application Track test and dynamic brake checking Running operation Brake safety devices Static air pressure (SAP) test for motor cooling Rotary machine in section Locomotive Brake Systems