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42 Cards in this Set
- Front
- Back
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Boiler water treatment is required for makeup water introduced to the boiler.
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True
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Slug feeding is used to generate foam to prevent carryover.
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False
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Dissolved solids are impurities such as calcium, silica, and iron dissolved in solution.
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True
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Priming and carryover can lead to water hammer and possible pipe rupture.
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True
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Oxygen in the boiler water is used to remove non-adhering sludge.
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False
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Water that contains a small quantity of minerals is hard water.
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False
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Chemicals added to the boiler water change scale-forming salts into non-adhering sludge.
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True
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Scale acts as an insulator and slows down the transfer of heat to the water.
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True
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Sludge is removed from the boiler using the surface blowdown valve.
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False
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A boil-out procedure is performed when a new boiler is installed.
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True
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Well water requires chemical treatment but city water does not.
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False
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The bypass feeder is located on the main steam header to provide efficient feeding.
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True
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Priming and carryover can be caused by opening the main steam valve too quickly.
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True
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Corrosion is the accumulation of sludge on boiler heating surfaces.
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False
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Fuel oil contamination of the boiler water can be prevented by dumping all fuel oil heater returns to waste.
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True
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Scale and sediment cause pitting of the boiler metal surfaces.
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False
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Sodium sulfide is an oxygen scavenger that is commonly used to treat boiler water.
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True
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Automatic valves are used to control the amount of chemicals added by the bypass feeder.
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False
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Rusting of the boiler metal is caused by oxygen in the boiler water.
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True
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Sludge rises when the boiler is on light load and is removed using the try cocks on the water column at the NOWL.
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False
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Scale formation can result in an increase in fuel required to generate steam.
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True
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Boiler water treatment required for most low pressure boilers is minimal if the boiler recovers all or most of the condensate returns.
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True
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The chemicals used to treat the boiler water depend on the pressure inside the boiler.
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False
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Fuel oil contamination of the boiler water most commonly occurs in plants using No. 6 fuel oil.
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True
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Oxygen in the boiler water can be removed by adding sodium sulfite.
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True
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Water that contains large quantities of minerals is called ___.
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hard water
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Small particles of water carried into steam lines are called ___.
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carryover
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___ is a condition caused when steam bubbles are trapped below the boiler water surface.
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Foaming
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___ is the exposure to highly alkaline elements, causing boiler metal corrosion at stress zones.
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Caustic embrittlement
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___ is used as an oxygen scavenger to remove oxygen from the boiler water.
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Sodium sulfite
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Non-adhering sludge is best removed when the boiler is ___.
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under light load
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Overheating of heating surfaces results in ___.
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bags, blisters, & burned-out tubes
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In low pressure boiler operation, chemicals for reducing oxygen and preventing scale can be added using a ___.
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bypass feeder
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Scale is caused by ___.
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scale-forming salts, hard water, & mineral deposits
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___ in the boiler water causes corrosion and pitting of the boiler metal.
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Oxygen
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High surface tension on the boiler water is shown by ___.
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fluctuation in the gauge glass
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Water is ___ to reduce the amount of oxygen.
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heated
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Increased surface tension of boiler water can be caused by ___.
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fuel oil inside the boiler
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Fuel oil is removed from the steam and water side of a boiler by using ___.
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caustic soda
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___ can lead to water hammer.
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Priming, Carryover, & High surface tension
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Non-adhering sludge is removed from the boiler by using the ___.
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bottom blowdown valve
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Hard water contains ___.
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scale-forming salts
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