NEW
Font size
Worksheets2.4 Blowdown Valves
Total questions: 13
Worksheet time: 7mins
What do we call the valves that are located on the blowdown line and are used to release water from the bottom of the boiler?
safety valves
bottom blowdown valves
butterfly valves
O S & Y valves
True or False. The bottom blowdown line is piping located at the highest point of the water side of a boiler.
True
False
True or False. All boilers have bottom blowdown valves.
True
False
Is the quick-opening valve or the slow-opening valve located closest to the boiler shell?
quick-opening valve
slow-opening valve
A ____ is a vessel that prevents damage to a sewer system from steam and hot water by holding blowdown water until it is cool enough for safe discharge.
pressure control
feedwater tank
blowdown tank
blowdown valve
Surface impurities increase the surface tension in a blowdown line by creating a film. This film prevents ____ bubbles from breaking through the surface of the water.
air
oxygen
CO2
steam
The best time to blow down a boiler to remove sludge and sediment si when the boiler is under a _____.
high load
light load
maximum load
A high-water condition can be corrected by ___.
closing the main steam stop valve
increasing the firing rate
performing a bottom blowdown
all of the above
Priming is dangerous and can lead to ___ hammer
steam
water
gas
air
Scale buildup on the water side of a steam boiler is caused by ___
an impure water supply
scale in raw water
improper boiler water treatment
none of the above
One reason to perform a bottom blowdown is to ___
use the heat energy of the blowdown water to preheat feedwater
remove sludge from the bottom of the boiler
reduce the concentration of dissolved oxygen
all of the above
A bottom blowdown should be performed at least once every ___
day
week
month
year
___ is the rapid fluctuation of the water level that occurs when steam bubbles are trapped below a film of impurities on the surface of the boiler water
water hammer
pitting
carryover
foaming
