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31 Cards in this Set
- Front
- Back
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What is the difference between HRT and Scotch Marine |
Scotch marine is internally fired HRT is externally fired |
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What is a slow opening valve What is a quick opening valve |
Slow is more than 5 turns Quick opening is 1 1/4 turns |
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How many BTUS are in #6 fuel oil |
150,000 |
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What are advantages of a rotory pump |
Self priming, high suction lift and high velocity liqiuds |
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What is critical temp and critical pressure |
Temp 705.4 Press 3206.2 pisa |
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Stamping on a safety valve |
Manufacturing name Design or type Pipe size Set pressure Capacity Capacity of life Year built ASME symbol |
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What are the following numbers mean 970.3 2.31 .491 14.7 |
970.3 amount of BTUS 2.31 height of a column of water to produce 1 PSI 491 one inch of mercury 14.7 atmospheric pressure |
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What is meant by power |
It is the rate at ehich engery is transformed or transmitted |
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What is the trust bearing in a turbine |
Purpose is to absorbed end thrust and maintain axial clearance between rotor ans casing |
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How do you determine the factor of evaporation |
Heat added to the boiler divided by 970.3 |
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How to conduct a over speed test |
Governer must be taken off Remove the load Trip the turbine manually Restart Increase the speed to 110% Observe and record trip speeds |
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Where is the highest the pressure in the boiler and why |
It is at the lowest part of the boiler and this happens due to the weight of the water amd pressure of the steam |
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What is a killowatt of electricity What is meant by a mega watt |
1000 watts 1 million watts |
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Safety valves |
Must be able to discharge all the steam a boiler can produce without allowing the pressure to rise 6 percent above thr MAWP |
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What is meant by the term combustion |
The rapid union of element or compond with oxygen that result in the product of heat |
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Harmless emissions |
Carbon dioixed Nitrogen Oxygen Water |
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Globe vs gate |
Globe is meant to throttle Gate is fully open or closed |
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What is volatile terms of coal |
Flamable gas within coal that is distilled off and burned about grates in suspension |
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How many btus in a pound of steam at 212 |
1150.3 btus |
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How does a rotary pump work |
This pump traps liquid inside forcing it around the casing and expells throughout the casing then liquid leaves through the discharge |
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What is banking |
Burning a soild fuel on grates defind as burning the fuel at a rate to maintain ingnition only |
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What is smoke in terms of conbustion |
Smoke is the unburned products of combustion leaving the boiler |
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What can you do with a first class firemans lic |
Have charge of and operate any boiler(s) where the safety valve set at a pressure not exceeding 25 psi or operate any boiler under the engieer in direct charge there of |
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What is meant by the term atomoziation |
This will break this liquid into a fine mist allowing the fuel to burn more effectively |
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Start a centrifigual pump |
Vent or prime Check or open the supply Check or close the discharge Start the pump Bring to speed Open the discharge |
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Water tube classifications |
As strict tube bent tube and number of drums |
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How is a thermocouple used |
One of the junction is used at a higher temp than the other |
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What is meant by boiling out |
In a new boilee there are accumulation of oil grease or paint theyre removed by boiling out with a alkaline detertant solution |
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What precent of heat supplied to the turbine is lost to the condenser cooling water |
70% |
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If two centrifugal pumps are connected in parallel the result would be |
Flow increase and constant pressure |
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What is the minimum number of air colume changes for the purge cycle |
4 air volume change |
