chapter 2. boiler systems Flashcards
what are the 4 boiler systems
feedwater system
fuel system
draft system
steam system
what does the feedwater system supplies
suitable water to the boiler at the temper-ature and pressure needed to sustain the steaming cycle
what does the fuel system supplies
fuel in the proper condition for the combustion process.
what does the draft system provides
provides air for combustion and discharges the gases of combustion into the atmosphere.
what does the steam system does
controls and directs the steam to the point where its energy is used for process operations, heating, or the generation of electricity.
Steam is
vapor that forms when water is heated to its boiling point
If the pressure controls fail, what is the last resort to control pressure in the boiler
the safety valve
what kind of steam contains more heat energy superheated steam or saturated steam
Superheated steam
when a steam header is used
when multiple boilers are in battery
Any time there is a reduction in steam pressure through a pressure-reducing station, there must be a ___to protect the devices designed to operate at the reduced pressure.
safety valve
Feedwater is
water supplied to a boiler.
_____protect boilers by preheating the feedwater to remove most dissolved gases.
Deaerators
Water weighs approximately
8.3 lb/gal
where deaerator tank is located
above the feedwater pumps
Each feedwater pump has its own _____to prevent hot water from the boiler from backing up if the check valve located close to the boiler fails.
check valve
