27-12-2012, 01:52 PM
Study of boiler mountings and accessories
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BOILER:
A boiler is used to generate steam at a desired pressure and temperature by
transferring heat produced by burning fuel to water to change it to steam.
It is a term applied to that device which generates steam at minimum pressure of 3.5
bar having minimum capacity of 22.75 litres.
FIRE TUBE BOILER:
In fire tube boiler, hot gases pass through the tubes and water surrounds them. Heat
from the gases (produced by combustion) is transferred to water, which is then
converted to steam.
Steam stop valve
A valve is a device that regulates the flow of a fluid (gases, fluidized solids,
slurries, or liquids) by opening, closing, or partially obstructing various
passageways
Function: to shut off or regulate the flow of steam from the boiler to the steam
pipe or steam from the steam pipe to the engine.
When the hand wheel is turned, the spindle which is screwed through the nut is
raised or lowered depending upon the sense of rotation of wheel. The passage for
flow of steam is set on opening of the valve.