Oil particles less than 15
ppm
Special Area
1) Black Sea, 2) Red Sea, 3) Mediterranean Sea, 4) Persian Gulf Area ,5) Gulf of Aden, 6) Antarctic Sea, 7) North Sea, 8) Wider Caribbean Sea, 9) Baltic Sea,
How will you discharge bilge ? *****
S Take C/E permission to discharge Oily Bilge through O.W.S
S If ship is outside special area, Vessel must be enroute , oily bilge are discharged through O.W.S with ODM system , oil particle less than 15 ppm.
S If ship is within special area , vessel must be enroute, oily bilge are discharge d through il filtering equipment with automatic stopping device, oil particle less than 15 ppm
S After operation, discharge quantity, time and location to be put in oil record book.
What is the bilge injection ?
It is emergency bilge suction lead to main sea water pump suction line, commonly called the bilge injection. This valve is of screw lift screw down type. No mud box or strainer this line.
It can be used in case of E/R flood & in case of emergency
Action of bilge flooded
At Sea : Use direct bilge, Bilge injection valve only flooded with dangerous condition
In port : Put into bilge tank if not capable sends to the shore
Bilge system requirement
1) Bilge system to be entirely separate from other system
2) Main bilge is connected two bilge pumps, direct bilge suction are fitted on each side of machinery space (P & S)
3) Emergency bilge suction lead to main cooling S.W pump suction line. Fitting mud box or strum box should be avoided.
4) Direct bilge suctions in the machinery space and tunnel, mud boxes fitted at platform level, easily accessible cleaning.
5) The bilge pump are self priming or capable of being quickly primed
6) Each suction is fitted a screw down non return valve in order to prevent inter communication 7) is fitted to the discharge side of the bilge pump (to prevent the discharge oil overboard)
Attachment of O.W.S
D Photo copy of MARPOL certificate D Original oil disposal to shore certificate D Dirty oil and sludge piping diagram D USCG warning
How do you operate the O.W.S ? ******* ) Take the permission form C/E
) Close the drain valve; open up all necessary valves on the system.
) Run pump, first taking suction from sea chest to fill up the separator with sea water keeping an eye on the shell pressure
) Open all vents and cocks to release air from separator. ) Switch on the ODM and alarm system
) Open steam heater valves and maintain the temperature about 60
°
C) Flush the oil content meter with fresh water for at least 5 minutes before putting the monitor operation. Then change over from fresh water to sampling line.
After operation, flush the system with sea water & flush oil content meter with Fresh water then bilge discharge amount & time & ship location to be put in O.R.B.
Why O.D.M is fitted at O.W.S ?
To monitor the oil content in the discharge water from O.W.S and to give warning.
How to test ODM ? Disconnect the sample pipe Switch on the ODM system
Inject the oil into sample line by opening sample line valve Alarm will operate
What is the coalescer ? Its function ?
Coalescer is the fitter element fitted at the oily water separator system made of steel wire mesh or Nylon fibres.
Its function is to coalesce tiny remaining oil particles to from a large drop (size) of oil.
ODM operation
A sample of the effluent is passed through a vertical cylinder, and receives energy emitted from an ultra violet lamp at the top of the cylinder. The energy emitted due to any fluorescence is monitored by a photoelectric cell, which produces a signal dependent on the amount of oil, present in the sample.
In the event of excess oil contents, this signal operates the diverting valve and the separator discharge is diverted to the slop tank instead of discharging overboard.
Maintenance to O.W.S
1) Routine attention is needed to obtain satisfactory performance 2) Obey the maker instructions.
3) Removed of internal contaminant
4) The prevention of corrosion by removal of sludge
5) Check for places where anti corrosion coating had deteriorated & apply anti-corrosive painting 6) Preservation of bilge pump
7) If coalescer is disposal checked & renewed 8) If coalescer is renewable checked and cleaned 9) Checked & test the ODM
10) Oil sensor probe must be cleaned 11) Cleaned & coated to catch plate 12) All test cock line clear
Instruction for oily water separator. (As a C/E)
1. Inform to C/E. C/E select the position after taking the ship position from the bridge. 2. Operation.
3. Regulation. In port not allow.
Outside special area Within special area 1. Vessel enroute.
2. Oil particle less than 15 ppm. 3. Has an operational oil discharge
monitoring system and alarm system.
1. Vessel enroute.
2. Oil particle less than 15 ppm.
3. Has an operational oil discharge monitoring system and alarm system and 15 ppm stopping device.
± Bilge overboard discharge valve must be tight close and kept under chain and lock and bilge connection must be blanked by Blind Flange. This connection must be absolutely free from oil and sludge.
± Bilge tank must be make ready and transfer to the bilge tank.
What is sewage ?
) Drainage and wastes from toilets, but not including wash water form basins, and wash tubs. ) All drainage from medical premises, including wash water from basins and wash tubs.
)
Drainage from spaces containing living animals. Emission of Black SmokeBlack smoke from ship may lead to pollution of air space, and many countries have their own regulations that are not to be violated. Smoke from ship is checked for blackness; by comparing with Ringelman Scale Chart. On this scale, white card is numbered ‘0’ and totally black card is ‘5’.
There is specific time limit, during which black smoke emission is not penalised.
The allowable black smoke emissions are:
1) Continuous emission must not be longer than 4 minutes
2) Short emission in every 20 minutes period, must be limited to 3 minutes.
3) Another part of ruling limits, emission must be not more than10 minutes in any 2 hour periods.
BIOLOGICAL (AEROBIC) SEWAGE TREATMENT PLANT
1) The unit is divided into three compartments, the aeration Chamber, Settling Chamber and Chlorinator.
2) Sewage enters Aeration tank, through soil inlet retained for about 24 hours being thoroughly mixed and aerated by the aerators located at the bottom of the tank.
3) The aerobic bacteria and micro organisms break down the organic wastes and produce new bacteria cells and organisms.
4) Air, which provides the oxygen for bacteria and micro organisms, is supplied by a rotary blower to the aerators
5) The mixture is replaced by incoming sewage into Settling Tank, after passing through coarse screen
6) All solids are precipitated in Settling Tank as activated sludge which is then returned by air lift back to the aeration tank where it is mixed with the incoming raw sewage.
7) Clean liquid is displaced into the chlorinator, where remaining bacteria are killed.
8) Discharge of harmless effluent is controlled by float switch connected to the discharge pump. Important Equipment
1) Two Rotary Blowers 2) Two Discharge Pumps
3) Safety Valve at Aeration Blower 4) High water level activating switch 5) Low water level activating switch 6) High water level alarm
Biochemical Oxygen Demand, BOD
Coliform Count
1) Coliform is the name given to bacteria group, found in intestine
2) Not normally harmful, but can cause Dysentery, Typhoid, and Gastro-enteritis. 3) Coliform Count checks effectiveness of disinfection
4) Carried-out on effluent sample and incubating it for 24 – 48 hours at 35