Auxillary Flashcards
Describe the procedure for testing a steering gear within 12 hours of sailing. (16)
Describe the procedure for checking a steering gear within 12 hours of sailing (16)
Check header tank oil levels top up if necessary
Check rudder stock bearing for leakage, and lubrication system
Check the steering gear pumps for leak, abnormal heat, vibration, noise
Check the running amps of the steering gear pump motors
Check the rams for any excessive leakage, or obstruction
Check the moving linkages between position senders, gyro-compass repeaters
Contact the bridge and ask the current position of the rudder to be centred, and relay if this reading is true on
the rudderstock.
Check emergency supply to one of the steering units
Check Auxiliary steering systems
Check power failure alarms for remote steering gear systems
Commence tests to port and starboard respectively stopping to relay the position of the rudder in relation
Carry out a hard over to hard over check and centre
The means of communication between the steering gear room and navigational bridge must always be operational
The procedure to test steering gear within 12 hours of sailing is:
Inform bridge and C/E you are going to test the SG
Check SG rudder carrier bearing is well lubricated
Check hunting gear/lever is in good condition
Check communication between SG and bridge is OK
Check oil levels
Start the main steering gear motor and check for leaks
Test movement of SG from bridge 35°P to 30°S and then time to ensure within 28 seconds.
Test emergency steering from 15°P to 15°S within 60 seconds
Rudder angle indicators in relation to the actual position of the rudder
SG floor must be clean and tidy
Handrail secured
Q2
With reference to refrigeration systems used on board ships:
(a) With the aid of sketch show the location of the gas charging connection. (6)
(b) Explain the correct method of charging refrigerant. (10)
- With reference to a refrigeration system
a. Describe how air is removed from a system (8)
• Change over the compressor to manual mode
• Now close the liquid stop valve after the condenser
• Pump the entire gas into the condenser by running compressor
• Stop the compressor when the suction pressure is just above zero
• Close the suction valve for compressor
• Allow the refrigerant to cool down inside the condenser
• Bleed air slowly by opening purging valve on condenser
Describe how and where refrigerant gas is added to a system (8)
To recharge system, connect a cylinder of new refrigerant to the inlet side of the compressor. You bleed it in slowly
monitoring the suction pressure of the compressor. The cylinder will get cold as the pressurised liquid is released and
changes into a gas. The condenser outlet sight glass will show an increased flow of liquid during recharge.
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b) Describe how and where refrigerant gas is added to a system.
b) Describe how and where refrigerant gas is added to a system.
The refrigerant gas is added to the system at a point where the system pressure is lower than the
pressure in the charging cylinder – this is done in the suction side of the compressor. If the system is
charged from the discharge side of the compressor then instead of refrigerant going from the
charging cylinder to the system it may start reversing, filling the charging cylinder itself.
Firstly, weigh the charging cylinder and record the weight minus the weight of the cylinder itself to
work out amount of refrigerant inside. Connect the charging cylinder to the charging valve and
attach the filing line to the suction side of the compressor. The system is run as normal, so the gas is
compressed, liquefied, and evaporated in the cold room. Using the charging valve to control gas flow
into the system, slowly allow fresh gas to the compressor suction. As the system is recharged, the
discharge and suction pressures will rise. The return line from the cold room will become noticeably
colder and return sight-glass will show more liquid flow.
With reference to the disposal of bilge water from the machinery spaces:
(a) Explain when it is NOT permissible to discharge the bilge water overboard, even via an oily water separator; (8)
(b) State the maximum permissible oil content of the overboard discharge; (2)
(c) Identify the documentation to be completed and state by whom, following such an operation. (6)
(a) It is NOT permitted to discharge bilge water overboard even via an Oily Water Separator due to the following reasons:
When the vessel is alongside, anchored or at rest.
If the bilge water originates from cargo pump rooms.
If less than 12 miles off-shore.
If in a special area and no automated stop and logging controls are fitted. This is to comply with MARPOL: Annex 1.
(b)The maximum permissible oil content of the overboard discharge is 15ppm.
(c)The Oil Record Book to be completed by the engineer who carried out the operation, to be verified by C/E and Captain, Time, date, location and amount discharged should also be recorded. ORB should be filled on the same day when the operation is carried out.
Q4
With reference to compressed air systems, explain the PURPOSE of EACH of the following:
(a) Fusible plug on compressor discharge (4)
(b) Fusible plug on air receiver (4)
(c) Bursting disc on water cooled air compressor (4)
(d) Drain valve (unloader) on compressor (4)
(a) Describe, with the aid of a sketch, the bilge injection system. (12)
(b) State the purpose of fitting a bilge injection system on board a ship. (4)
a) The emergency bilge system is used to pump the bilges when flooding is imminent. The diameter of the “direct emergency suction” should be at least 2/3 the diameter of the main injection pipe for steamships and the same size for motor ships.
b) This injection valve arrangement allows for the main sea chest to be bypassed in case of an emergency (e.g. flooding in ER), allowing water to be drawn from the lowest point in the machinery space by the main circulating seawater pump (or the highest capacity seawater pump).
(a) Describe, with the aid of a sketch, the bilge injection system. (12)
(b) State the purpose of fitting a bilge injection system on board a ship. (4)
a. State the purpose of fitting a bilge injection system onboard a ship (4)
Direct emergency discharge of floodwater using the highest capacity pumps within the ER systems
The function of the bilge injection system is to remove large volumes of water from the engine room in the event of serious flooding. To do this, the bilge injection valve is opened, and the main sea water suction valve is shut, then the largest capacity pumps in the engine room will remove large quantities of water from the lowest point of the engine room. The diameter of the bilge injection valve in relation to the diameter of the main sea water suction valve should be not less than two thirds its size.
b) State the purpose of fitting a bilge injection system on board a ship.
To prevent flooding by removing large volumes of water from the machinery space.
c) Identify the location on board a ship of a bilge injection system.
The lowest point of the engine room.
