Podcast
Questions and Answers
If a boiler ignition system on a merchant vessel uses a gas pilot light, which fuel oil ignition method is being employed?
If a boiler ignition system on a merchant vessel uses a gas pilot light, which fuel oil ignition method is being employed?
What could be a potential consequence of using lube oil that has not been properly filtered?
What could be a potential consequence of using lube oil that has not been properly filtered?
In a diesel engine, what effect could a decrease in the fuel pump delivery pressure have on engine performance?
In a diesel engine, what effect could a decrease in the fuel pump delivery pressure have on engine performance?
When operating in parallel, diesel engines driving alternators must maintain a set frequency. What does the governor characteristic 'Promptness' refer to in this context?
When operating in parallel, diesel engines driving alternators must maintain a set frequency. What does the governor characteristic 'Promptness' refer to in this context?
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What issue could lead to excessive vibration in an automatically fired auxiliary boiler?
What issue could lead to excessive vibration in an automatically fired auxiliary boiler?
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After filtering lube oil, what contaminant would typically not be removed?
After filtering lube oil, what contaminant would typically not be removed?
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What should you do if it becomes necessary to reduce the feed water temperature below 165°F in an evaporator?
What should you do if it becomes necessary to reduce the feed water temperature below 165°F in an evaporator?
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What do exhaust pyrometer readings provide an indication of?
What do exhaust pyrometer readings provide an indication of?
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When should fuel combustion in a diesel engine cylinder begin?
When should fuel combustion in a diesel engine cylinder begin?
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Which type of filter will deplete the additives in lubricating oil?
Which type of filter will deplete the additives in lubricating oil?
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What is it called when a change in engine speed is required before a governor can make a corrective movement of the fuel rack?
What is it called when a change in engine speed is required before a governor can make a corrective movement of the fuel rack?
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What will be the result of reducing the clearance between a valve stem and rocker arm?
What will be the result of reducing the clearance between a valve stem and rocker arm?
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Why must diesel engines driving alternators operating in parallel maintain a set frequency regardless of load changes?
Why must diesel engines driving alternators operating in parallel maintain a set frequency regardless of load changes?
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What could be a likely cause of excessive vibration in an automatically fired auxiliary boiler?
What could be a likely cause of excessive vibration in an automatically fired auxiliary boiler?
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In a diesel engine starting circuit, what would an indicator using a pneumercator primarily measure?
In a diesel engine starting circuit, what would an indicator using a pneumercator primarily measure?
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When using a dry uncoated sounding rod or tape to measure water depth in a reserve feed water tank, what kind of reading can be expected?
When using a dry uncoated sounding rod or tape to measure water depth in a reserve feed water tank, what kind of reading can be expected?
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Where does contaminated oil enter the centrifuge in a disk type centrifugal purifier?
Where does contaminated oil enter the centrifuge in a disk type centrifugal purifier?
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Why is condensate pumped from the condenser to the DC heater instead of directly to the boiler?
Why is condensate pumped from the condenser to the DC heater instead of directly to the boiler?
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Study Notes
Fuel Oil Ignition Methods
- A gas pilot light is used for the ignition of fuel oil in a continuous burning system, known as a "hot start" system.
Lubricating Oil Filtration
- Improperly filtered lube oil can result in wear and tear on engine components due to the presence of contaminants like dirt, metal particles, and water.
Fuel Pump Delivery Pressure and Engine Performance
- A decrease in fuel pump delivery pressure can lead to reduced engine power, incomplete combustion, and potential damage to engine components.
Diesel Engine Synchronization
- Diesel engines driving alternators in parallel must maintain a set frequency to ensure that the electrical output of the generators is synchronized. This ensures that the power grid remains stable and the electrical equipment running off the generators operates correctly.
Governor Characteristic: Promptness
- The governor characteristic promptness describes the speed at which the governor responds to changes in engine speed. A higher promptness value indicates a faster response time.
Boiler Vibration
- Excessive vibration in an automatically fired auxiliary boiler can be caused by issues such as unstable combustion, improper air and fuel mixing, or a malfunctioning burner.
Lub Oil Filtration
- While filtration removes contaminants, it typically doesn't remove additives from lubricating oil. Additives are designed to enhance the oil's performance and protect the engine.
Evaporator Feed Water Temperature
- Reducing the feed water temperature below 165°F in an evaporator could lead to increased scaling and corrosion within the evaporator.
Exhaust Pyrometer Readings
- Exhaust pyrometer readings provide an indication of the temperature of the exhaust gases leaving the engine. This can be used to assess engine performance, identify problems with combustion, and detect potential overheating issues.
Diesel Engine Fuel Combustion Timing
- Fuel combustion in a diesel engine cylinder should begin at the optimum point in the compression stroke, just before the piston reaches top dead center (TDC), to maximize engine efficiency and minimize emissions.
Additive Depletion
- Full-flow filters are known to deplete additives in lubricating oil, as they filter all the oil passing through the engine.
Governor Characteristic: Lag
- When a change in engine speed is required before a governor can respond and make a corrective movement of the fuel rack, it is called "lag". This delay can occur because of mechanical inertia.
Valve Clearance
- Reducing the clearance between a valve stem and rocker arm will result in increased friction and wear, as the valves won't have sufficient space to operate freely. This can lead to valve sticking and reduced engine performance.
Diesel Engine Synchronization and Load Changes
- Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes to ensure that electrical power is delivered smoothly to the network.
Auxiliary Boiler Vibration
- Excessive vibration in an automatically fired auxiliary boiler could be caused by issues with combustion, improper air and fuel mixing, or malfunctioning components like the burner.
Pneumercator Indicator
- A pneumercator in a diesel engine starting circuit primarily measures the pressure in the starting air system.
Dry Sounding Rod/Tape Reading
- If using a dry uncoated sounding rod/tape to measure the water depth in a reserve feed water tank, you can expect a reading that is slightly less than the actual depth due to the surface tension of the water.
Centrifugal Purifier Infeed
- Contaminated oil enters the centrifuge (disk type) through the feed inlet, which is typically located at the top or bottom of the centrifuge.
Condensate Routing
- Condensate is pumped from the condenser to the DC heater instead of directly to the boiler because the condensate typically contains dissolved impurities. Heating the condensate in the DC heater helps to remove these impurities before it's sent to the boiler.
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Description
Test your knowledge on marine engineering by answering questions about what to do when feed water temperature drops below 165°F and interpreting exhaust pyrometer readings.
