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84 Cards in this Set
- Front
- Back
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What is Tenon |
A tenon is a pin made of metal to fasten the rotor of a turbine to the shrouding and then pin over to hold in place |
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Electronic precipitators |
A high voltage DC current is applied to the electroids which caused the Dust particles to become ionized and then to be attracted to the ground collecting plate |
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Safety valves on super heaters are set |
Lower than the drum safety valves |
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What is the purpose of a Thrust bearing on a turbine |
To keep the shaft properly position in the axial plane against thrust load |
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What is the function of the diffuser ring on a turbine type centrifugal pump |
The diffuser ring converts velocity to pressure |
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Shrouding ring |
The shrouding ring stiffness the outer rim of blades against vibration and confine the steam to the passage of the blades |
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What is the safety factor of 1200 PSI and the maximum pressure is 200 PSI |
1200 PSI÷ 200 PSI = 6 |
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A pump located in the basement of a building shows a pressure of 100 PSI what would be the pressure at the 10th floor if it is 100 feet above the pump |
100 - (10floors×10ft/floor ×0.433psi/ft)= 56.7psi |
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What boiler uses an on-off button |
Fire tube boiler |
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What does the whistle on the top of the water column indicate |
High or low water condition |
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What type of oil used in hfc refrigerant |
Ester oil |
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What is the purpose of the accumulation test |
To test the relieving capacity |
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Under what conditions do you blow down the water wall when in service |
Never under no condition |
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What is used to remove fly ash |
Electrostatic precipitators or bag house |
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What power rate on a motor control contact increases Nema |
It increases |
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What coal has a high fix carbon |
Anthracite |
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How do you treat temporary hardness= boil = boil |
How do you treat permanent hardness= Chemicals |
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How do you know when your DA tank is not working properly |
Excessive use of oxygen scavenger chemicals (sulfite) |
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The exhaust from steam or turbine is used to do what |
Preheat feedwater |
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What is the name for water treatment test chemicals |
Reagents |
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How is the voltage wired on a collector AC /DC, high /low for Collector Plate fly ash |
HighDC to probes and Grounded collector plates |
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How much condenser cooling water needed to condense 1 lb of steam |
50lbs |
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Which are set lower the drum safety or the super heater |
Superheater safety valve are set lower than drum safety valves |
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Device that secures blazed to flywheel |
Shrouding ring |
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On the low side of the system what is the relief pressure limit of a ruptured disc |
15psi |
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When did it become unlawful to vent hfc to the atmosphere |
11-15-95 |
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When did it become unlawful to vent CFC and hcfc to the atmosphere |
7-1-92 |
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Why are sealing glands needed in a turbine/2 Jobs |
1.They prevent steam from leaking out of the casting along the shaft at the steam end. 2. Stop air from leaking into the casting at the vacuum end |
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Packing on the low side (water seal) |
A Water seal prevents leakage of air into the casting |
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What technique do you use to control nitrous oxide emissions |
By injecting ammonia into the furnace of a boiler |
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An automatic control valve with two valves and discs |
A Balancing valve |
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How do you ensure complete combustion will take place |
Increase secondary air |
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Name a technique to reduce the sulfur dioxide emissions from coal plants |
Mechanical collectors electrostatic precipitators and bag filter houses |
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In a pulverized coal plant how is the coal conveyed to the burner |
Primary air |
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Name two widely used secondary elements what's convert differential pressure to a usable output signal |
Transmitter and receiver |
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Why is air bypass around the air heater |
To ensure that the flue gas temp does not fall below a minimum temperature at low load. |
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Primary purpose of using a wet scrubber |
Wet scrubbers remove sulfur dioxide |
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Electrostatic precipitators are used to |
Remove fly ash and soot |
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An internal feedwater line in a water tube boiler is placed below water level and extended the drum |
For better distribution and less thermal shock |
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How do you remove non-condensables in the condensate tank |
Vacuum pump |
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Why do you extract steam from a turbine |
Used for heating domestic water or warm and cool areas |
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With a four wire Wye system phase to neutral is |
277 |
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Switchboards are rated as the maximum voltage that can handle |
Amps |
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The Clean Air Act was established |
1963 |
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A Scott Marine boiler can be easily recognized because it is |
Internally fired |
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A dry pipe located in the steam space of a fire tube and water tube boiler is used to |
Remove moisture from the steam |
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The conductivity of the makeup water is 390 micromhos. The conductivity of the feed water is 45 micromhos. What is the percentage of condensate return |
MC-FC ×100 ÷MC-CC |
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The chief heat-producing elements in fuel controls are |
Carbon and hydrogen |
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What scale can be removed by boiling or raising water temperature |
Temporary |
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A boiler has 2800 furnace temperatures and 600 stack temperature reading |
What is the boiler efficiency Boiler efficiency= ( input- stack loss×100) ÷ input 2800-600×100=220000 ÷2800=78.57 |
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The removal of moisture from Air using a cooling coil is called |
Passive dehumidification |
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Thermocouples generate an electrical signal that is |
Proportional |
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How do you remove nitrous oxide from a boiler |
Boiler analysis use ammonia+ catalyst |
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What feed water reads functions with steam flow,feed water flow, water level |
3 element feedwater system |
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How do you protect a superheater |
Screen wall tubes and controlling temperature |
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When should you open the water leg valve on a HRT boiler |
When the wall is offline and properly cooled or out of service |
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How do you remove non condensables in a condensate tank |
Vacuum pump |
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How do you remove particles from a boiler |
Surface blow down and bottom blowdown |
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When do you do a copper test in a boiler system and why |
To check for corrosion |
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What is critical temperature and pressure |
Critical pressure is which water and steam have the same density Critical temperature is where water cannot exist as a liquid |
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What does a 3 element feed water regulator sense |
Liquid level in the boiler. Flow of feed water in the drum. Flow of steam leaving the drum. |
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At what temperature should you not use copper or brass for gauges |
406 F |
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A turbine that makes high velocity Steam |
Impulse turbine |
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A water seal is used to stop what on a turbine |
Leakage of air |
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What type of blades are on a turbine |
Stationary and rotating |
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When boilers are in operation superheater drains are (closed) |
And when boiler are on warm up superheater drains are (open) |
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How do you increase the feed water pressure on a steam turbine pump |
Increase the feed water pressure by throttling on the Leslie feed water pressure regulator |
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What controls water temperature in the boiler |
Aquastat |
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What are the four steps of a zeolite Rejuvenation water softener process |
Backwash, Brine flush, Rinse & Service |
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What does a 3 element feed water regulator sense |
1.Liquid level in the boiler drum 2.Flow of feed water to the boiler drum. 3.Flow of steam leaving the boiler drum |
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Why do you extract Steam from a turbine |
Used for heating domestic water or warming cool areas |
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What does an orifice plate do in the operation of a boiler |
Balance heat transfer |
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What is a counter flow turbine |
To balance the blades |
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What by product has the largest heating value |
Butane |
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In a y configuration you read 208 across the phase what is the reading from phase to ground |
120v |
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What is the name of the pump that pumps water back to the condenser |
Condenser water pump |
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Spreader and chain grate Stoker's are types of |
Overfeed |
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Supercritical boilers operate at |
3206.2 psia and 705.4 degrees in a supercritical boiler water and steam have the same density |
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When did it become unlawful to vent CFC and hcfc to the atmosphere |
7-1-92 |
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When did it become unlawful to vent hfc-134a |
11-15-95 |
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How do you find rated boiler horsepower |
By finding Total heating surface ÷ Vertical Fire tube 14 Horizontal Fire tube 12 Water tube 10 |
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What is the purpose of a water column |
To steady the turbulence of boiler water between the drum and the gauge glass so that it's level may be determined more accurately |
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Where should a gauge glass be located |
In an easily seen location with its lowest visible point at least 2 inches above the lowest safe water level in the boiler |
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What happens to the water level on watertube boilers when the firing rate is increase or decrease rapidly |
The water level in The gauge glass to First go up then rapidly drop, the drop in steam pressure causes internal flashing forcing the water to go up when a sudden drop in load |
