Boiler Mountings, Fittings and Accesories Flashcards
Its function is to protect the boiler shell from over pressure and subsequent explosion.
a relief valve that prevents the boiler pressure from raising over its normal working pressure by automatically opening when the boiler pressure exceeds the normal working pressure, thus allowing excess steam to escape into the atmosphere until the pressure comes down to its normal value.
Safety Valves
A steam boiler must be fitted with a ______ (also known as a _______) which isolates the steam boiler and its pressure from the process or plant.
To control the flow of steam from within the boiler and to stop it completely when required.
Boiler Stop Valves / Steam Stop Valves
is located in front of the boiler in such a position that the level of water can easily be seen by the attendant.
Water Level Indicator
Fitted in front of a boiler in such a position that the operated can conveniently read it. It reads the pressure of steam in the boiler and is connected to the steam space by a siphon tube.
Pressure Gauge
To remove periodically the sediments deposited at the bottom of the boiler while the boiler is in operation and to empty the boiler while it is being cleaned or inspected.
Blow-off Valve
To ensure the safety of the boiler from being damaged by overheating due to the water level falling very low in the boiler.
Fusible Plug
Is an accessory in which the feed water is preheated before it enters into a boiler, the heat is taken from the waste flue gases of the boiler
Economizer
To control the flow of water from the feed pump to the boiler and to prevent the backflow of water from the boiler to the pump when the pump pressure is less than the boiler pressure or when the feed pump ceases to work.
Feed check Valve
It is a heat exchanger in which products of the heat of combustion are utilized to dry the wet steam and to make superheated by increasing its temperature.
Superheater
Saturated steam obtained from all types of industrial boilers contains some water particles which decries the economy and efficiency of steam engines and steam turbines.
Steam Separator
To drain away or return to the boiler, the water collected in the steam pipe or steam jacket due to partial condensation of steam without allowing steam to escape.
Steam Trap
Delivers feed water at a pressure higher than that in the boiler.
Feed Pump
Is a simple device used to supply feed water into the boiler. It has no moving parts and water is supplied into the boiler by the action of steam flowing through nozzles. This type of feed pump is used in locomotives.
Injector
