II. MÉTODO
2.6. Aspectos éticos
a) Ensure that the turbocharger LO tank is filled to the correct level and replenish if necessary.
b) Ensure that valves to all instruments are open and that the instruments are reading correctly.
c) Check that the low temperature central cooling system is operating and that cooling water is circulating through the turbocharger LO cooler.
d) Set the valves as in the following table:
position description Valve
Open No.1 turbocharger LO pump suction valve L-161V Open No.1 turbocharger LO pump discharge valve L-152V Open No.2 turbocharger LO pump suction valve L-162V Open No.2 turbocharger LO pump discharge valve L-153V Operational Discharge pressure relief valve L-156V Operational Cooler 3-way ‘expansion type’ bypass valve L-155V
Open Cooler inlet valve L-157V
Open Cooler outlet valve L-158V
Open Bypass filter circulating pump suction valve L-159V e) Check that the duplex filter is clean and that the bypass filter is
operational.
f) Start the turbocharger LO tank bypass filter LO circulating pump and check that oil is flowing back to the turbocharger LO tank.
g) Select the turbocharger LO pumps for REMOTE mode and select one as the master pump and the other as the standby pump. Start the master pump and check that oil is flowing to both turbochargers and returning from the turbocharger bearings.
h) The turbocharger LO system is now operational and the turbochargers may be operated.
note: The turbocharger LO must be tested frequently in order to determine whether or not it is fit for further service. Samples should be taken from the circulating oil and not directly from the tank.
Maersk Seletar Machinery Operating Manual
2.8.3 Generator enGines LubriCatinG oiL systeM
introduction
Each generator engine has its own engine driven lubricating oil circulation pump and an electrically driven prelubrication pump which ensures that all running surfaces are effectively lubricated before the engine is started. After the engine has started and the engine driven lubrication pump is supplying oil at the correct pressure, the prelubrication pump is stopped. Both pumps take suction from the engine sump. The prelubrication pump mode switch should be set to the AUTO position whenever a generator engine is selected as a standby engine. The prelubrication pump may be selected for manual (MANU) operation if required, in which case the pump is started and stopped by means of START and STOP pushbuttons at the prelubrication pump starter panel.
The oil supply from both pumps passes through a duty/ standby filter system via a 3-way valve and a lubricating oil cooler before flowing to the engine system. The flow of oil through the cooler is regulated by means of a three-way within the engine lubrication system. The turbocharger bearing is lubricated by oil from the main circulating system via a branch from the inlet line to the engine.
The lubricating oil in each of the generator engine sump must be maintained at the correct level and the sumps are replenished with oil taken from the generator engine LO measuring tank. This tank is filled by gravity from the generator engine LO storage tank. Oil is pumped to the generator engine sumps by the dedicated air driven LO transfer pump located at the generator engine lubricating oil measuring tank.
The LO charge of any generator engine may be cleaned on a continuous basis by means of an associated centrifugal separator. There are two generator engine centrifugal separators and each separator serves two generator engines.
A system of crossover valves allows either of the generator engine centrifugal separators to clean oil from the sump of any generator engine. The generator engine lubricating oil separating system is described in section 2.8.5 of this machinery operating manual.
Generator engine lubricating oil should be sampled and tested at intervals suggested by the lubricating oil supplier. The results of the testing provide an
indication as to engine operation and the need for lubricating oil replacement. To Oily Bilge
Tank (Dirty Side)
PIALMC
Illustration 2.8.3a Generator Lubricating Oil System
Key
Lubricating Oil Compressed Air Steam Condensate Waste Oil / Drain L-15V
CoolerLO
No.4 Generator Engine
To Oily Bilge Tank (Dirty Side)
L-28V L-27V
L-26V
Generator Engine Lubricating Oil
Storage Tank (25.4 m3) L-42V GE Lubricating
Oil Measuring Tank (0.1m3)
From Separator System
L-19V
From Deck Filling Connections
GE LO Transfer Pump
LS LALMC No.4 Lubricating
Oil Sump Tank
PIALMC PX TX TIAHMC
CoolerLO
No.3 Generator Engine
LS LALMC No.3 Lubricating
Oil Sump Tank
PIAL
MC PX TX TIAHMC
CoolerLO
No.2 Generator Engine
LS LALMC No.2 Lubricating
Oil Sump Tank
PIALMC PX TX TIAHMC
CoolerLO
No.1 Generator Engine
LS LALMC No.1 Lubricating
Oil Sump Tank
PI CI
To Oily Bilge Tank (Dirty Side)
To Separator System
Maersk Seletar Machinery Operating Manual
Drain PlugDPS DPI
DPAH MC
From Control Air System P
To LO Transfer and Separating
Systems From Main LO Storage / Settling
Tanks and LO Separator
LS LAH MC
Illustration 2.8.4a Stern Tube Lubricating Oil System
Key
Lubricating Oil Central Cooling Water Compressed Air Drain
Emergency Stern Tube Lubricating Oil
Gravity Tank (0.1m3)
Stern Tube Lubricating Oil Circulation pumps (3.0m3/h x 3kg/cm2)
14.7 - 16.9m 9.95m 4.85m
4.5m Loaded Water Line
Stern Tube Lubricating Oil Sump Tank
(3.6 M³) L-201V
L-187V L-167V
L-143V
L-194V L-195V L-193V
Foward Seal Lubricating Oil Pumps (0.3m3/h x 2kg/cm2)
Change Over Switch C1
Change Over Switch C2
Sampling Valve
To Oily Bilge Tank
(Dirty)
Drain Collection Unit
Flow Regulator Units
Air Control Unit
From Fresh Water Hydrophore System Stern Tube
Lubricating Oil Tank (Capacity 0.1m³)
V49 V48
Low Alarm
V2 V3 V1
V13 V15 Ballast Water Line
1.0µ W-189V
W-188V To/From Central Cooling System 3MU
Maersk Seletar Machinery Operating Manual
2.8.4 stern tube LubriCatinG oiL systeM stern tube seals
Manufacturer: Kobelco Eagle Marine Eng. Co. Ltd.
Type: Simplex compact synthetic rubber seals
Model: AX-1060
stern tube air seal Control unit
Manufacturer: Kobelco Eagle Marine Eng.Co.Ltd
No. of sets: 1
Type: 3A
stern tube Lubricating oil Circulating pump
Manufacturer: Taiko Kikai Industries Co. Ltd.
No. of sets: 2
Type: Gear
Model: NHG-3MT
Capacity: 3.0m³/h at 3kg/cm²
forward stern tube seal Lubricating oil Circulating pump Manufacturer: Namiwa Pump Mfg. Co. Ltd.
No. of sets: 2
Type: Gear
Model: TLG-2
Capacity: 0.3m³/h at 2kg/cm²
sump tank Lubricating oil fine filter Manufacturer: Yoowon Industries Ltd.
No. of sets: 1
Type: JGP Cellulose
Model: BK-4214A-X/RF
Capacity: 0.4m³/h at 1 micron
sump tank Lubricating oil fine filter pump
Manufacturer: Taiko Kikai Industries Co. Ltd.
No. of sets: 1
Type: Gear
Model: NHG-0.5M
Capacity: 0.4m³/h at 2kg/cm²
stern tube Lubricating oil Cooler
Manufacturer: Tranter International AB
No. of sets: 1
Type: Plate - Stainless Steel
Model: GC-16P
Capacity: 12,300kcal/h x 3.0m³/h
introduction
The stern tube assembly along with its forward and aft seal arrangement is designed to provide support for the propeller shaft in two oil lubricated bearings, and to prevent the leakage of lubricating oil from entering the engine room and leakage to sea. The placement of the aft stern tube seals prevents the ingress of sea water into the stern tube which would result in contamination of the lubrication system with subsequent damage to the bearings and the onset of corrosion. The lubrication system is designed to maintain oil tightness despite varying temperatures.
stern tube Lubrication system and operation
The principle components of the stern tube lubrication system comprises the following:
• A pressurised lubricating oil tank which provides adequate hydrostatic pressure to prevent ingress of sea water into the system whilst maintaining the stern tube full of oil.
• Air control unit to maintain the required regulated air pressure to the seal arrangement and stern tube LO tank.
• Lubricating oil pumps enabling the oil to circulate through the system (forward and aft bearings) and maintain a positive head of pressure from the stern tube tank.
• Stern tube air control unit.
• An emergency stern tube gravity tank.
• Drain collection tank - A 10 litre tank to collect oil/ water leakage residue from any leakage from the void between No.2 and No.3 aft stern tube seals. The tank’s contents are monitored by a high level alarm, alerting the duty engineer of excessive leakage.
• Stern tube sump tank - collection of oil from the stern tube system, reservoir for the forward seal oil pumps and make-up for losses in the main circulation system.
• Forward stern tube seal circulating pumps.
• Fine filter and pump for cleaning the oil in the sump tank.
The stern tube LO tank unit is located above the centre line of the propeller shaft. The two circulating pumps take suction from the tank and discharge through the stern tube LO cooler into the lower section of the stern tube.
The oil entering the stern tube is maintained at a variable pressure by the air supplied by the air control unit to the pressurised lubricating oil tank. The circulating oil returns to the pump suctions with any losses being made up from the sump tank.
The lubricating oil flowing through the stern tube provides lubrication to and absorbs heat from the bearings, therefore increasing the oil temperature. It is essential that an adequate flow of lubricating oil is maintained to reduce friction and assists in removing the heat generated. The excess heat is removed by the following:
• The circulating oil through the stern tube LO cooler
• The fresh water in the stern tube cooling tank surrounding the stern tube which in turn is cooled by sea water flowing past.
The oil in the stern tube system should periodically be sampled and tested to ensure that its properties are maintained within the manufacturer’s specifications. The presence of any water in the oil will indicate leakage at the aft stern seal arrangement. If analysis indicates any metal particles in the oil, this may indicate a failure of the forward or aft bearings.
The oil in the tank may be pumped out using the LO transfer pump and discharged to the LO settling tank or waste oil system as required. The oil may also be cleaned by use of the main lubricating oil separator.
note: If the quality of the oil has deteriorated to the level that it needs replacement, the contaminated oil can be transferred using the LO transfer pump outlined in section 2.8.6 of this manual.