If a problem has been encountered with No.3 oil seal resulting in oil being collected in the drain tank, it can be temporarily be replaced in service by using seal No.3S as an alternative. However repairs must be undertaken at the earliest opportunity. This seal is brought into operation by closing the oil valves to and from seals No.3/3S, oil inlet valve L-180V and return valve L-195V (to the stern tube lubricating oil sump tank); this will prevent oil being supplied to the aft seal space No.3/3S.
In the event of there being a problem with the air seal flow regulating system at the control panel the changeover switches C1 and C2 from the MAIN to the SUB position. This will operate the changeover air relay and regulator and the back-up system will come into operation. If the air control unit fails completely, the stern tube emergency gravity tank must be brought into operation. This tank puts a constant static head onto the space between aft seals No.3 and No.3S.
Maersk Seletar Machinery Operating Manual
To Oily Bilge Tank (Dirty Side)
To Oily Bilge Tank (Dirty Side)
Illustration 2.8.5a Lubricating Oil Separating System
Key
Lubricating Oil Compressed Air Steam Condensate Waste Oil/Sludge L-15V
L-33V L-79V L-78V L-46V
L-56V
L-48V
L-65V L-64V
L-52V L-51V
L-54V
L-31V L-77V L-76V L-43V
L-25V
L-73V L-71V
L-16V To Oily Bilge Tank (Dirty Side)
L-28V L-27V
L-26V
Stern Tube Lubricating Oil
Sump Tank (3.6m3) Generator
Engine Lubricating Oil
Storage Tank (25.4 m3)
L-44V L-42V
L-3V
Lubricating OilMain Storage Tank
(113.9 m3) GE Lubricating
Oil Measuring
Tank (0.1m3) L-2V L-1V
L-35V
Lubricating Oil Transfer Pump (10 m3/hx3kg/cm2)
GE Lubricating Oil Separator Supply Pumps
(0.9 m3/h x3kg/cm2) Main Lubricating
Oil Separator Supply Pump
(8.9 m3/h
Air Air Air
F-68V No.2 G.E
SeparatorLO (900 litres/h)
F-67V MainLO
Separator (8,900 litres/h) TAHMC
L-5V
L-38V L-24V
L-41V Main Engine
Crankcase Main Lubricating Oil
Sump Tank
(98.2 m3) LS LALMC
L-9V L-6V
L-8V L-7V
L-49V
L-4V Lubricating OilMain
Settling Tank (99.7 m3)
Port Starboard
TC
No.2 GE LO Separator Heater Main LO
Separator Heater
Condensate
GE LO Transfer Pump
Main Engine T/C LO
Tank (5.7m3) LS
LALMC No.4 Generator Engine Lubricating Oil Sump Tank
L-72V
L-45V Upper Deck
PI CI
To Bilge Shore Connection
1 No.1 G.E
SeparatorLO (900 litres/h)
No.1 GE LO Separator Heater
PAL PI
LALMC No.1 Generator Engine Lubricating Oil Sump Tank
LS
LALMC No.2 Generator Engine Lubricating Oil Sump Tank
LS
LALMC No.3 Generator Engine Lubricating Oil Sump Tank
Sludge Tank (178.6 m3) LS
LAHMC
Maersk Seletar Machinery Operating Manual
2.8.5 LubriCatinG oiL separatinG systeMs Main Lubricating oil separators
Manufacturer: Westfalia Separator Korea Ltd.
No. of sets: 1
Type: Automatic self-cleaning
Model: OSD 35-91-067
Capacity: 8,900 litres/h Main Lubricating oil separator heater Manufacturer: DongHwa Entec
No. of sets: 1
Type: Shell and tube
Model: 650CZ-2
Capacity: 8.9m3/h x 400,500 kcal/h Main Lubricating oil separator supply pump Manufacturer: Taiko Kikai Industries Co. Ltd.
No. of sets: 1
Model: NHG-10MT
Capacity: 8.9m³/h at 3.0kg/cm² Control unit:
Manufacturer: Westfalia Separator Ag
Model: Simatic D10
introduction
There is one centrifugal self-cleaning LO separator dedicated to clean the lubricating oil associated with the following:
• Main engine LO sump tank
• Stern tube LO sump tank
• Main engine turbocharger LO tank
note: The self-cleaning separator is also capable of taking suction via the main LO separator supply pump direct from the main engine crankcase chamber. The separator cannot return the cleansed LO directly to the tank.
Except for the main engine crankcase the separator can be used for batch treatment or for continuous treatment. Cleansed oil from the separator can be discharged to the main engine LO sump or to the main engine LO settling tank; or the stern tube LO sump tank if LO from the stern tube system is being treated.
The main lubricating oil separator is supplied with oil by an LO separator supply pump which passes the LO through a steam heater before it enters the separator.
Control air is supplied to the separator to control the supply of oil to the bowl.
Domestic fresh water is supplied for sealing, actuation and flushing purposes.
separator operation
The heated dirty oil enters the separator and the centrifugal force created by the rotating bowl causes the liquid mixture to separate into its different constituents within the disc stack.
The solid particles suspended in the oil settle on the underside of the discs and slide down into the solids holding space at the periphery of the bowl. The smooth disc surfaces allow the solids to slide down and provide self-cleaning of the discs. Each bowl assembly is fitted with a regulating ring, sometimes referred to as a gravity disc. The diameter of the gravity disc will determine the position of the interface between the oil and the collected separated water and is set according to the density of the oil to be cleaned.
As the separator is of the self-cleaning type, the accumulated solids within the holding space are ejected at predetermined intervals depending on the quality of the oil. The cleaning cycle is achieved automatically; a number of control valves act to allow the oil to bypass the separator and to open the bowl for a set period of time. There is a water monitoring system (WMS), which controls the discharge of water and a sludge monitoring system (SMS), which controls the ejection of sludge.
WarninG
Care must be taken when operating the separator system. hot oil and steam are present and can result in serious injury if leakage occurs.
there is a fire risk from the presence of hot oil and all precautions must be taken to prevent a fire and to deal with one should an outbreak occur.
the extinguishing system must be checked frequently.
separator Control system
The D10 control unit is used for the automatic ejection control and condition monitoring of the fuel oil separator. Each fuel oil separator has its own D10 control unit.
The control unit has three modes of operation.
1) Partial ejection 2) Total ejection
3) Preselected partial ejection followed by total ejection
The monitoring and control system provides two basic monitoring systems.
1) Water monitoring system (WMS) 2) Sludge space monitoring system (SMS) Water Monitoring system
Water which is separated from the oil collects in the outer part of the bowl. The separating disc in the bowl continuously directs a small flow from the outer part of the bowl to the sensing liquid pump, which discharges this flow to a conductivity sensor. If the conductivity sensor detects the presence of water it means that a reasonable amount of water is present in the bowl. The control system then opens a solenoid operated valve to discharge the water through the dirty water outlet; the separator is operating as a purifier. When the water has been discharged the valve is closed and the separator resumes operation as a clarifier. Under normal circumstances very little water should be present in lubricating oil but leakage at cooler, etc. can result in large quantities of water being present. If more than small quantities of water are detected in the lubricating oil the operator should suspect a water leakage into the LO system and take immediate steps to detect the source of water leakage.
sludge Monitoring system
Desludging of the bowl normally takes place at timed intervals, which are changed to suit the quality of the oil being treated. A sensor in the sludge monitoring system detects the buildup of sludge/water in the sludge space of the bowl. If the amount of sludge becomes excessive, the system will activate the automatic desludging procedure even though a timed desludging operation is not due. If there are more than two untimed desludging operations between normal timed desludging operations an alarm is activated and this requires the intervention of an engineer. The illuminated Liquid Crystal Display (LCD) provides information about the operating parameters of the separator; all the relevant process data and alarm conditions are displayed. The components which are controlled or monitored by the control system include:
• Oil inlet/bypass valve (three-way circulation valve)
• Flushing water
• Operating water
• Circuit and water discharge valve
• Water sensor
• Oil inlet temperature
• Audible alarms
Software assignment for each separator is carried out in the factory using a password function. Any alterations to the set parameters should only be carried out by a person authorised to make such changes. Changes in parameter settings are not an operational requirement of the separators and are not normally necessary once the system has been configured for the type of lubricating oil being treated. If any change in parameter setting is required this must only
Maersk Seletar Machinery Operating Manual
To Oily Bilge Tank (Dirty Side)
To Oily Bilge Tank (Dirty Side)
Illustration 2.8.5a Lubricating Oil Separating System
Key
Lubricating Oil Compressed Air Steam Condensate Waste Oil/Sludge L-15V
L-33V L-79V L-78V L-46V
L-56V
L-48V
L-65V L-64V
L-52V L-51V
L-54V
L-31V L-77V L-76V L-43V
L-25V
L-73V L-71V
L-16V To Oily Bilge Tank (Dirty Side)
L-28V L-27V
L-26V
Stern Tube Lubricating Oil
Sump Tank (3.6m3) Generator
Engine Lubricating Oil
Storage Tank (25.4 m3)
L-44V L-42V
L-3V
Lubricating OilMain Storage Tank
(113.9 m3) GE Lubricating
Oil Measuring
Tank (0.1m3) L-2V L-1V
L-35V
Lubricating Oil Transfer Pump (10 m3/hx3kg/cm2)
GE Lubricating Oil Separator Supply Pumps
(0.9 m3/h x3kg/cm2) Main Lubricating
Oil Separator Supply Pump (8.9 m3/h
Air Air Air
F-68V No.2 G.E
SeparatorLO (900 litres/h)
F-67V MainLO
Separator (8,900 litres/h) TAHMC
L-5V
L-38V L-24V
L-41V Main Engine
Crankcase Main Lubricating Oil
Sump Tank
(98.2 m3) LS LALMC
L-9V L-6V
L-8V L-7V
L-49V
L-4V Lubricating OilMain
Settling Tank (99.7 m3)
Port Starboard
TC
No.2 GE LO Separator Heater Main LO
Separator Heater
Condensate
GE LO Transfer Pump
Main Engine T/C LO
Tank (5.7m3) LS
LALMC No.4 Generator Engine Lubricating Oil Sump Tank
L-72V L-45V Upper Deck
PI CI
To Bilge Shore Connection
1 No.1 G.E
SeparatorLO (900 litres/h)
No.1 GE LO Separator Heater
PAL PI
LALMC No.1 Generator Engine Lubricating Oil Sump Tank
LS
LALMC No.2 Generator Engine Lubricating Oil Sump Tank
LS
LALMC No.3 Generator Engine Lubricating Oil Sump Tank
Sludge Tank (178.6 m3) LS
LAHMC
Maersk Seletar Machinery Operating Manual
be carried out with the approval of the Chief Engineer and after consultation with the control system manual. It is essential that the correct separating temperature is set for the grade of lubricating oil being centrifuged. Too low a temperature can result in inefficient separation but too high a temperature can have a damaging effect on the lubricating oil.
The desludging time interval is initially set so that the bowl will open and discharge the sludge and water before the sludge space if filled. If the desludging time interval is too short there is excessive sludging and performance of the system can suffer. Each separator discharges sludge to the LO sludge tank when a sludging of the separator bowl is activated. There is an inlet valve to operating manual, 2.10.3 and 2.14.1 respectively.