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First Class Steam License
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First Class Steam License
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First Class Steam License___ are usually used to create the draft needed to overcome the resistance caused by
economizer tubes - ANS-Induced draft fans (they pull the draft through the furnace)
___ control increases safety by adding a linking system that prevents the airflow from
going too low for the amount of fuel flow during load changes - ANS-single-point
positioning
___ feedwater regulators are found on package fire-tube or watertube boilers where
feedwater pumps run either intermittently or consistantly - ANS-Float
___ is small water particles and impurities carried out of the boiler into the steam lines -
ANS-Carryover
___ is the process where the water level in a boiler momentarily rises with an increase
in steam demand - ANS-Swell
___ 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 - ANS-Foaming
___ is used to adjust the air-fuel ratio based on the results of a flue gas analysis -
ANS-Oxygen trim
______ are used for loads that require dry steam, such as turbines - ANS-superheaters
_________ fittings are used for water columns operating above 350 PSI - ANS-Steel
__________pressure is the pressure caused by the weight of a column of water -
ANS-hydrostatic
___is a filtration process in which the water is pressurized and applied against the
surface of a semipermeable membrane - ANS-Reverse osmosis
***When water is boiling, the water in the boiler and steam above it are at ___ - ANS-the
same temperature and pressure
# 17 is being thrown out - ANS-...
, A ___ is a boiler fitting that reduces the turbulence of boiler water to make it easier to
measure the water level - ANS-water column
a ___ is a controller that distributes steam production requirements across several
boilers to maintain the steam pressure at the set point - ANS-plant master
A ___ is a feedwater heater that separates oxygen and other gases from the steam
before releasing the gases into the atmosphere - ANS-deaerator
A ___ is used in applications where there are varying flows of condensate and
additional condensate storage capacity is required - ANS-surge tank
A ___ steam trap is a steam trap that has a single movable disc that rises to allow the
discharge of air and cool condensate - ANS-thermodynamic
A 10 degree F rise in feed-water temperature produces approximately ___% savings in
fuel - ANS-1%
A 3-element feedwater regulator measures the steam flow from the boiler..... the ___
into the boiler, and the water level - ANS-feedwater flow
A bottom blowdown should be performed at least once every ___ - ANS-day
A cold-lime soda softener works at ___ - ANS-ambient temperature
a control Loop uses a____________as the control element - ANS-steam pressure
controller
a control system uses a__________to execute a control strategy - ANS-control Loop
a cyclone separator is a cylindrical device that separates water droplets from Steam
using_________ - ANS-centrifugal force
A direct cause of overheating of the boiler tubes is ___ - ANS-scale formation on the
tubes
A disadvantage of a timer-controlled blowdown is that it does not ___ - ANS-consider
changes to the feedwater
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