Podcast
Questions and Answers
During steam plant watch operations, which condition requires the most immediate attention?
During steam plant watch operations, which condition requires the most immediate attention?
- Low water level in the main boiler (correct)
- High level in the main condenser
- Deareating tank pressure at 2 psig above normal
- High lube oil storage tank level
A refrigeration compressor shaft seal has failed. What is the most appropriate initial action for the watch engineer?
A refrigeration compressor shaft seal has failed. What is the most appropriate initial action for the watch engineer?
- Pump the system down and isolate the leak.
- Tighten the shaft seal packing to reduce leakage and operate the compressor by hand.
- Secure the compressor immediately and close the suction and discharge valves. (correct)
- Close the suction valve, secure the compressor, and then replace the shaft seal.
What is the recommended method for storing oxygen and acetylene cylinders?
What is the recommended method for storing oxygen and acetylene cylinders?
- Upright with cylinder caps off
- Upright with cylinder caps screwed on (correct)
- Horizontally with cylinder caps off
- Horizontal with cylinder caps screwed on
Why is live auxiliary steam typically attemporated before entering a flash evaporator's feed heater?
Why is live auxiliary steam typically attemporated before entering a flash evaporator's feed heater?
A hot air manifold temperature is recorded at 122°F. What is the equivalent temperature in Celsius?
A hot air manifold temperature is recorded at 122°F. What is the equivalent temperature in Celsius?
Which fuel oil ignition method is commonly found on automatically fired auxiliary boilers aboard merchant vessels?
Which fuel oil ignition method is commonly found on automatically fired auxiliary boilers aboard merchant vessels?
What is the likely cause of injection lag in a diesel engine?
What is the likely cause of injection lag in a diesel engine?
A lube oil filter is used to remove contaminants. What contaminant will remain in the lube oil after effective filtering?
A lube oil filter is used to remove contaminants. What contaminant will remain in the lube oil after effective filtering?
Diesel engines driving alternators in parallel must maintain a set frequency despite load changes. Which governor characteristic accomplishes this?
Diesel engines driving alternators in parallel must maintain a set frequency despite load changes. Which governor characteristic accomplishes this?
Excessive vibration is noted in an automatically fired auxiliary boiler. What could be the cause?
Excessive vibration is noted in an automatically fired auxiliary boiler. What could be the cause?
Flashcards
Priority Steam Plant Condition
Priority Steam Plant Condition
Low water level in the main boiler requires immediate attention to prevent damage.
Refrigeration Compressor Shaft Seal Failure
Refrigeration Compressor Shaft Seal Failure
Secure compressor, close suction/discharge valves to isolate leak, then repair shaft seal.
Storing Gas Cylinders
Storing Gas Cylinders
Store oxygen and acetylene cylinders upright with cylinder caps screwed on for safety.
Attemporating Auxiliary Steam
Attemporating Auxiliary Steam
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122°F to Celsius
122°F to Celsius
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Fuel Oil Ignition Method
Fuel Oil Ignition Method
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Cause of Injection Lag
Cause of Injection Lag
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Pneumercator Function
Pneumercator Function
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Measuring Exhaust Gas Temperature
Measuring Exhaust Gas Temperature
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DC Heater Functions
DC Heater Functions
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Study Notes
- Priority attention is needed when a steam plant watch operating condition includes a low water level in the main boiler.
- If a refrigeration compressor shaft seal blows, secure the compressor, and close the suction and discharge valves.
- Oxygen and acetylene cylinders should be stored upright with the cylinder caps screwed on.
- Live auxiliary steam is normally attemporated before entering the feed heater of a flash evaporator to reduce the rate of scale formation on heating surfaces.
- A temperature of 122°F is equivalent to 50°C.
- High energy electric sparks are commonly found on automatically fired auxiliary boilers aboard merchant vessels.
- Injection lag in a diesel engine may be due to the diesel fuel having a high viscosity.
- A lube oil filter can remove most contaminants from lube oil, but water will remain after filtering.
- Diesel engines driving alternators in parallel must maintain set frequency using compensation.
- Excessive vibration in an automatically fired auxiliary boiler may be caused by flame failure.
- A pneumercator indicates tank fluid level.
- Using a dry uncoated sounding rod or tape to measure water depth in a reserve feed water tank provides an inaccurate reading.
- Contaminated oil enters the centrifuge in a disk type centrifugal purifier through the funnel body.
- Condensate is pumped from the condenser to the DC heater, because it must be deaerated before entering the boiler.
- A pyrometer measures the exhaust gas temperature of a diesel engine cylinder.
- Exhaust valve grooving and corrosion are caused by sodium, sulfur, and vanadium.
- A dirty atomizer sprayer plate in the burner of an auxiliary boiler is indicated by an unevenly shaped burner flame.
- Temperature control valves in diesel engine closed freshwater cooling systems bypass the flow of jacket water around the cooler to prevent localized hot spots.
- A pyrometer produces a voltage by heating a junction of two dissimilar metals.
- The DC heater functions to store, heat, and deaerate feedwater.
- Excessive lubricating oil consumption in a running diesel engine can be caused by excessive valve-guide clearance.
- Increasing the valve clearance between a valve stem and rocker arm will cause the valve to close later.
- Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by worn valve guides.
- Valve lash or clearance refers to the clearance between the top of the valve stem and the rocker arm.
- Crank web deflection readings will give a positive indication of worn main bearing journals.
- Cooling water pumps driven by direct-reversing diesel engines are usually curved impeller vane with tangential outlet.
- Rapidly discharging condensate into the DC heater during normal steaming conditions could cause water hammer in the economizer.
- Most large main propulsion diesel engines use a duplex lube oil strainer to ensure a positive flow of oil at all times.
- Throttling a burner air register on an auxiliary boiler can result in a smoky boiler operation.
- Fluctuating pressure in the closed cooling system of a main propulsion diesel engine can be caused by cavitation in the cooling water pump.
- The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the control rack.
- The minimum design height of the DC heater is determined by the minimum net positive suction head required by the main feed pump.
- A rising jacket temperature at a constant load indicates that a piston is about to seize.
- The bulk of the solid material entering a centrifugal purifier with lube oil is trapped in the bowl.
- The DC heater automatic level dump valve is used to maintain a proper condensate level in the condenser hotwell.
- While at sea, if it becomes necessary to reduce the feed water temperature below 165°F, secure the evaporator until the feedwater temperature can be raised to 165°F or more.
- Exhaust pyrometer readings provide an indication of the distribution of the load between engine cylinders.
- Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and end when fuel injection has been completed.
- Adsorbent filters deplete additives in lubricating oil.
- A change in engine speed required before a governor can correct fuel rack movement is known as speed droop.
- Reducing the clearance between a valve stem and rocker arm will result in the valve closing sooner.
- Diesel engine injection lag is caused by the compressibility of the fuel.
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