Mariner Advancement CEL MOTORS Casualty Control and FO Purifiers
The purpose of the interlocked three - way valve shown in the illustration is to Illustration MO - 0058
change fuel from heavy to light oil or vice - versa while insuring that oil is returned to the proper day tank
The device labeled " H " , shown in the illustration is referred to as the Illustration MO - 0112
centrifugation chamber bottom gasket
The device labeled " B " , shown in the illustration is known as the Illustration MO - 0112
centripetal pump chamber cover
The item indicated by the letter " F " of the device shown in the illustration is the Illustration MO - 0112
Upper bowl gasket
After stopping a diesel engine with a high main bearing temperature , what is the time one needs to wait before a diesel engine crankcase can be opened ?
Not less than 30 minutes .
In the event of a crankcase rich oil mist to air mixture explosion , where the doors are blown off the engine , which of the following may occur after the initial explosion ?
A secondary explosion as air is drawn back into the crankcase .
The device labeled " A " , shown in the illustration , is known as the Illustration MO 0112
regulating ring
Which of the following precautions should be taken prior to starting the separator shown in the illustration ? Illustration MO - 0127. A.) Check for the correct oil level in the gear housing . B.)Make sure the separator is properly assembled . C.)Release the bowl brake and confirm proper valve line up .
All of the above are correct .
Which of the following would indicate a scavenging air fire in a slow speed diesel engine ?
An increase in jacket water temperature in the area local to the fire .
On a slow - speed diesel engine vessel equipped with an ALCAP fuel oil purification system , what would be a symptom of an opening solenoid valve leaking by ?
An increase in the rate at which the purifier sludge tank is rising .
After removing the bowl hood of the device shown in the illustration , excessive quantities of sludge are visible . Which of the following statements represents the approach to rectify the situation ? Illustration MO - 0112
Disassemble the entire unit , clean all components , replace any defective gaskets and use the proper lubricants where required .
All alarms occurring on the control unit of the device shown in the illustration will Illustration MO - 0127
shut off the oil feed to the separator
The gasket " U " shown in the illustration , is used to seal the liquid space below the Illustration MO - 0112
sliding piston
If a diesel engine were running at 20 % overload with a smoky exhaust , you should
slow the engine allowing it to gradually cool
Item " O " of the device shown in the illustration is the Illustration MO- 112
spindle nut
Which of the following statements describes " N " shown in the illustration ? Illustration MO - 0112
the centrifuge disc stack
Crankcase explosions in propulsion diesel engines result from
the ignition of unburned fuel and air in the crankcase
If the bowl of a disk type centrifugal purifier when operated as a separator is not primed , the
Oil will be lost through the water discharge ports
From the graph shown in the illustration , determine the size of the regulating ring required for the proper operation of the fuel oil centrifuge if the fuel oil specific gravity is 0.9 kg / dm3 at 68 ° F , and the separating temperature is 158 ° F . Illustration MO - 0113
110 mm
The wear liner shown in the illustration is indicated by the letter Illustration MO - 0112
" R "
Which of the labeled figures illustrated , represents the correct alignment mark relationships of a properly reassembled centrifuge bowl ? Illustration MO - 0022
A
The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be Illustration MO - 0012
203 ° F to less than 212 ° F
Which of the following oil mist to air ratios would most likely lead to the most severe crankcase explosion ?
5-7 % by volume .
If a scavenging air space fire occurs on a slow speed diesel engine and the engine is stopped , which of the following should be done to prevent distortion due to heat ?
Engage and turn the engine with the jacking gear .
Oil in a scavenging air space on a slow - speed diesel engine can be ignited by which of the following ?
Excessive piston ring blow - by .
Where does the shoot cycle operating liquid first come in contact with the rotating forces of the device shown in the illustration ? Illustration MO - 0112
In the opening chamber labeled " L " .
How is oil supplied to the device shown in the illustration ? Illustration MO - 0127
In this arrangement an independent pump is utilized .
Which of the following is one of the ways to prevent a scavenging fire on a slow speed diesel engine ?
Keep the scavenging space clean and free of oil .
The area indicated by the letter " W " , shown in the illustration is correctly termed the Illustration MO - 0112
Opening chamber
The device shown in the illustration can be automatically or manually desludged . The closing sequence at the end of the desludging cycle is initiated by opening which of the labeled components listed below ? Illustration MO - 0012
Q
When changing over from residual to distillate fuel on a slow - speed diesel main engine , what is a good guideline to follow regarding the change over ?
Rate of temperature change of fuel to the engine should not exceed 2 degrees C per minute .
A motor vessel has two centrifuges to pre - treat fuel to the engine ( s ) which may be configured to operate in series or parallel . A large quantity of water has been determined to be present in the fuel . What actions would you take to minimize the effect of water prior to fuel injection ?
Run first centrifuge as a purifier in series with second as clarifier and reduce throughput and increase ' shoot ' cycles ' .
In pre - treating fuel oil on a motor vessel , what would you consider the most important factor to prevent high temperature corrosion on an engine's combustion components ?
Run one centrifuge as a purifier at a reduced rate to minimize water , especially salt water , in the fuel .
A motor vessel has three centrifuges to pre - treat the fuel which can be configured to operate in series , parallel , and series - parallel . A large quantity of water is determined to be present in the fuel . How would you configure the centrifuges to deal with this problem ?
Run two centrifuges in parallel as purifiers discharging to the third one in series as a clarifier .
The discharge nozzle shown in the illustration , is indicated by the letter Illustration MO - 0112
S
If a tube ruptures in a water - tube auxiliary boiler due to low water , you should
Secure both the fires and the feed inlet valve
What is the best way of stopping an overspeeding diesel engine ?
Secure the fuel supply and block the air intake .
When changing over from residual to distillate fuel on a slow - speed diesel propelled vessel , you should limit the rate of temperature change of the fuel in order to prevent what operational difficulty ?
Seizing and scuffing of fuel pump plungers and injector needle valves due to thermal effects on close clearance components .
The port " X " shown in the illustration allows water to enter the adjoining chamber . During what cycle of operation will this occur ? Illustration MO - 0112
Sludge discharge cycle
Which of the following statements describes what will occur if the annular spaces , indicated by the letter " K " of the device shown in the illustration , became restricted ? Illustration MO- 112
The bowl will fail to close when starting and the unit will not shoot when operating .
Which of the following statements is accurate concerning the vibration sensing device used with the separator shown in the illustration ? Illustration MO - 0127
The detector mechanism consists of an armature suspended on a flexure pivot and restrained from motion by a permanent magnet acting through a small air gap .
If the separating temperature is to remain constant , what is the relationship between the specific gravity of the oil and the required size of the regulating ring ? Illustration MO - 0113
The larger sized regulating rings are designed to be used with oils of lower specific gravities .
The unit shown in the illustration is beginning the sludge discharge cycle . The operating liquid solenoid valve has been energized and space " J " is filling up . Which of the following actions should occur next ? Illustration MO - 0112
The liquid enters via port " X " into the opening space with the net resultant force causing the piston slide to move down .
If item " F " begins leaking during operation , which of the following operating conditions will NOT occur ? Illustration MO - 0112
The oil / water interface will remain in the same neutral position .
As Chief Engineer of a slow - speed diesel engine vessel equipped with an ALCAP fuel oil purification system . You note a definite increase in the rate at which the purifier sludge tank is rising . One of the first items to check on your system would be which of the following ?
The opening water solenoid for leak through .
Which of the following statements represents the working principle of the water transducer used with the separator shown in the illustration ? Illustration MO - 0127
The probe and sensor measure the dielectric constant through capacitive reactance of the process fluid .
If a crankcase explosion due to a hot spot were to occur , the size of the explosion is dependent on which of the following ?
The ratio of oil mist to air in the crankcase .
What terminates the sludge discharge cycle of the device shown in the illustration ? Illustration MO - 0112
The solenoid valve closes , allows the water in the opening chamber to bleed off through " S " , and the sliding piston moves upward due to the force developed in area " J " .
During the normal operation of the centrifuge shown in the illustration , the operating liquid solenoid and bypass valves for the cleaning cycle should be in which position ? Illustration MO - 0112
The solenoid valve is closed and the bypass valve is closed .
How may water be removed from the bowl of the separator as shown in the illustration ? Illustration MO - 0127
The water may be removed through the water drain valve or through the sludge ports during the sludge discharge cycle .
Your ship is equipped with ALCAP heavy fuel oil purifiers . The watchstander reports excessive water drained from the fuel oil service tank . Which component should he check ?
The water transducer located in the clean oil discharge line .
As shown in the illustration , which of the following conditions would be responsible for a " low - pressure in oil outlet " alarm to be indicated ? Illustration MO - 0127
Throughput too low
What is used as the primary operating medium during the sludge discharge cycle , shown in the illustration ? Illustration MO - 0112
Water
In the illustration shown , under what conditions would valves " 2 " and " 3 " be closed and valve " 6 " be opened ? Illustration MO - 0077
When the HFO centrifuges are being run as separators and clarifiers respectively .
Heavy fuel oil used in the system shown in the illustration , will have the lowest viscosity Illustration MO - 0058
at the main engine fuel oil header
In a by - pass type lubrication system for a diesel engine , the dirty oil line to the centrifuge should be taken from the
bottom of the lube oil sump
During normal operation , the liquid retained in space ' J ' of the device shown in the illustration is Illustration MO - 0112
directly forcing the sliding piston upward to keep the bowl closed
In the device shown in the illustration , the component lettered " A " is the MO - 0012
dirty oil input port
When reassembling the bowl of the centrifuge , shown in the illustration , the alignment mark on the locking ring passes the bowl cover mark in excess of the manufacturer's specifications . This is due to Illustration MO - 0012
excessive wear of the locking ring and / or bowl threads
While operating the fuel oil centrifuge shown in the illustration , the fuel oil is being continuously ejected with the sludge and the seal water . The probable cause is the Illustration MO - 0012
gravity disk inside diameter is too large
Whether using a centrifuge or a simple filter , oil cleaning and filtration will be the most effective when the oil is at a
high temperature and a low viscosity
The area indicated by the letter " L " of the device shown in the illustration is properly called the Illustration MO - 0112
injection chamber
The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl , with straight , vertical , interior surfaces , is that the illustrated unit Illustration MO - 0012
is self desludging
The system shown in the illustration utilizes a water transducer which is Illustration MO - 0127
located in the oil outlet piping
While operating the fuel oil centrifuge shown in the illustration , the bowl fails to open for sludge ejection . The probable cause is that Illustration MO - 0012
the seal ring on the operating slide is defective
The force developed by the liquid within space " J " of the device shown in the illustration depends upon Illustration MO - 0112
the speed of the bowl and the condition of seal " U "
The device labeled " D " , as shown in the illustration , is the bowl Illustration MO - 0112
top
The device labeled ' C ' shown in the illustration is known as the Illustration MO - 0112
upper locking ring
