Cochran Boiler

Topics: Steam locomotive, Steam engine, Locomotive Pages: 5 (1493 words) Published: September 11, 2011
Cochran boiler is a vertical, multitubular, internally fired, fired, fire tube boiler.It is a low pressure,medium capacity boiler.The maximum capacity of cochran boiler is about 4000 kg of steam per hour and the maximum pressure of steam produced is about 10 bat.It mainly consists of a cylindrical shell with hemispherical crown, fire box,grate, combustion chamber,smoke box and chimney for connecting pressure gauge, water gauge, safety valve,steam stop value,fusible plug.

The boiler is filled with water to the specified level using a feed pump.The feed check valve permits the feed water to entire into the boiler ,but does not allow water to flow back.Coal is fed into the grate through the fire hole and burnt.Ash formed is collected in the provided below the grate and is removed.The hot gases from the firebox pass through the flue pipe to the combustion chamber.From the combustion chamber the hot gases pass through the horizontal flue tubes to smoke box.The gases from the smoke box are discharged to the atmosphere through the chimney.Smoke box is provided with a door for cleaning the flue tubes and smoke box.The hot gases while passing through the flue tubes transfer heat to the water which is already heated by the fire box.The water gets converted into steam and accumulates in the steam space at the top of the shell.This steam is taken to the steam supply pipe through the steam stop valve.

Cochran boiler

It is one of the best types of vertical multi-tubular boiler, and has a number of horizontal fire tubes it also a Low Pressure Boiler.

Construction: Cochran boiler consists of a cylindrical shell with a dome shaped top where the space is provided for steam. The furnace is one piece construction and is seamless. Its crown has a hemispherical shape and thus provides maximum volume of space.

Working: The fuel is burnt on the grate and ash is collected and disposed of from ash pit. The gases of combustion produced by burning of fuel enter the combustion chamber through the flue tube and strike against fire brick lining which directs them to pass through number of horizontal tubes, being surrounded by water. After which the gases escape to the atmosphere through smoke box and chimney.


• Shell diameter 2.75 m
• Height 5.79 m
• Working pressure 6.5 bar (max. pressure = 15 bar)
• Steam capacity 3500 kg/hr (max. capacity = 4000 kg/hr) • Heating surface 120 m2
• Efficiency 70 to 75% (depending on the fuel used)

A locomotive boiler is the central part of the engine for any steam-powered locomotive train. Boilers similar to the locomotive boiler, which is also called a fire-tube boiler, can power other vessels, including ships. The fire-tube boiler, however, is most commonly identified with steam locomotives, used around the world since the early 19th century. Steam locomotives are still in use in the 21st century, often for historical or novelty travel, despite the emergence of more modern diesel and electric locomotive engines.

Steam engines were first developed in the late 1700s and early 1800s. The principle of steam power is that steam from heated water is a form of pressurized gas. Safely and properly directed, this gas can generate massive levels of energy. A steam locomotive applies this energy to move a train long distances at a high rate of speed. The locomotive boiler is the most important part of the process, creating the steam and directing it to power the locomotive’s wheels.

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