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The steam injector is a common device used for delivering water to steam boilers, especially in steam locomotives. It is a typical application of the injector principle used to deliver cold water to a boiler against its own pressure, using its own live or exhaust steam, replacing any mechanical pump.
A sectional diagram of a typical steam boiler feed injector, simplified to show the major parts common to such injectors, showing typical proportions, and using colour and shading to hint at temperature, pressure, and velocity variations in the fluid flows. The SVG was hand coded using a text editor.
A boiler feedwater pump is a specific type of pump used to pump feedwater into a steam boiler.The water may be freshly supplied or returning condensate produced as a result of the condensation of the steam produced by the boiler.
injector valves, which allow steam to force water into the boiler when needed [3]: 42 water gauges , which allow the level of water in the boiler to be monitored [ 3 ] : 91 mechanical stoker controls (when fitted to larger coal-fired locomotives) or oil feed controls for oil-fired locomotives
Boiler water must be treated in order to be proficient in producing steam. Boiler water is treated to prevent scaling, corrosion, foaming, and priming. Chemicals are put into boiler water through the chemical feed tank to keep the water within chemical range. These chemicals are mostly oxygen scavengers and phosphates. The boiler water also has ...
This is achieved by maintaining a supply of fuel to the fire, monitoring the smoke from the fire and controlling it by the use of primary air through the fire bed/grate and secondary air through the firebox door and maintaining the boiler water level by use of steam injectors so that it covers the firebox crown sheet at all times – otherwise ...
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