P99 LOW PRESSURE BOILERS
CH. 3 EXPECTED QESTIONS AND
CORRECT RESPONSES
The water in a boiler is heated, turns to steam, and
leaves the boiler through the ______________ .
main steam line
When steam releases heat in the heat exchanger, it
turns to ______________ .
condensate
What type of pump returns condensate from the
system back to the boiler?
vacuum
What valve allows the flow of water in one direction?
The check valve
The feedwater _________ valve should be located as
close to the shell of the boiler as practical.
stop
A ________ after each heating unit allows condensate
to pass through to the return line.
steam trap
What may be required on some boilers to remove
oxygen and other gases?
feedwater heater
The feedwater _____ valve opens and closes
automatically.
check
, The vacuum pump pumps water and discharges air to
the __________ .
atmosphere
The range of pressure on the vacuum switch is
usually ___________ .
2" to 8"
The primary function of a low water fuel cutoff is to
_________ .
shut down the burner if the water level drops below the
safe operating level
Water added to the boiler to replace water lost due to
leaks and blowing down is know as _____ water.
makeup
Excessive use of cold city makeup water reduces
overall boiler efficiency because the water must be
______ before use in the boiler.
heated
An auxiliary low fuel cutoff is installed ________ .
slightly below the primary low water fuel cutoff
The _____ shuts off the burner in the event of low
water.
low water fuel cutoff
Water is supplied to the condensate return tank by the
______ pump.
vacuum
The feedwater regulator is located at the ______.
NOWL
The ________ maintains a constant water level in the
boiler.
feedwater regulator
The low water fuel cutoff should be tested ________ .
CH. 3 EXPECTED QESTIONS AND
CORRECT RESPONSES
The water in a boiler is heated, turns to steam, and
leaves the boiler through the ______________ .
main steam line
When steam releases heat in the heat exchanger, it
turns to ______________ .
condensate
What type of pump returns condensate from the
system back to the boiler?
vacuum
What valve allows the flow of water in one direction?
The check valve
The feedwater _________ valve should be located as
close to the shell of the boiler as practical.
stop
A ________ after each heating unit allows condensate
to pass through to the return line.
steam trap
What may be required on some boilers to remove
oxygen and other gases?
feedwater heater
The feedwater _____ valve opens and closes
automatically.
check
, The vacuum pump pumps water and discharges air to
the __________ .
atmosphere
The range of pressure on the vacuum switch is
usually ___________ .
2" to 8"
The primary function of a low water fuel cutoff is to
_________ .
shut down the burner if the water level drops below the
safe operating level
Water added to the boiler to replace water lost due to
leaks and blowing down is know as _____ water.
makeup
Excessive use of cold city makeup water reduces
overall boiler efficiency because the water must be
______ before use in the boiler.
heated
An auxiliary low fuel cutoff is installed ________ .
slightly below the primary low water fuel cutoff
The _____ shuts off the burner in the event of low
water.
low water fuel cutoff
Water is supplied to the condensate return tank by the
______ pump.
vacuum
The feedwater regulator is located at the ______.
NOWL
The ________ maintains a constant water level in the
boiler.
feedwater regulator
The low water fuel cutoff should be tested ________ .
