lube oil system.pdf

Daniel Robson T/V KINGS POINTER Revised: 5/14/01 Chief Engineer Lube Oil Systems Page: 1

LUBE OIL SYSTEMS

INTRODUCTION T-AGOS class vessels has four (4) Lube Oil Systems; the Bow Thruster Lube

Oil System, the Propulsion Motor Lube Oil System, the Shaft Lube Oil System and the Lube Oil Fill and Transfer System.

The Bow Thruster Lube Oil System provides lubrication to the bow thruster

gearbox and provides a static head to keep seawater out of the gearbox. The Propulsion Lube Oil System consists of a spring type forward pedestal

bearing and a forced lubricated gravity drain system, which provides lubrication, cleaning and cooling to the aft journal and thrust bearing.

The Shaft Lube Oil System provides shaft sealing against the sea and

lubrication, cleaning and cooling to the shaft bearings. The Lube Oil Fill and Transfer System is designed to store lube oil, transfer

lube oil and purify lube oil to and from the main diesel engines. The system consists of two storage tanks, a transfer pump, a purifier, an eight valve manifold and associated piping.

FUNCTIONAL DESCRIPTION

Bow Thruster Lube Oil System Lubrication to the bow thruster is gravity supplied from its 25-gallon head tank which is located 10 feet above load water level (Emergency Switchboard and Generator Room (01-6-0).

The bearings and gears in the thruster gearbox are oil lubricated. The gearbox has a capacity of 20 gallons, is normally completely full and is piped directly to a head tank. The 25-gallon head tank serves a dual purpose. it provides a means to monitor and add to the oil level and it also provides a static head of oil, which is in excess of that imposed by the seawater on the propeller shaft seal, thereby causing an outward flow of lubricant in the event the seal becomes worn or is damaged. The bow thruster uses Mobilgear 632 , MIL-L-2105B (GO 80-90W gear oil).

Propulsion Motor Lube Oil System Each aft journal and thrust bearing is equipped with a separate and independent forced lubrication system consisting of the following main components: •25-gallon head tank. •30-gallon sump tank with level indicator and immersion heater.


•Duplex strainer. •Flow Monitor/Control and two (2) sight flow indicators. •Back pressure regulating valve •Heat exchanger •SHERMAN, Model CV3, 5 GPM, 35 PSI positive displacement rotary gear pump with a.5 HP, 1800 RPM, 440 volt, 3-phase, 60 Hz motor. •Relief valve. •Various valves, pressure switches, pressure gauges, thermometers. The lube oil pump takes suction from the system's 30-gallon sump tank and discharges it to the bearings via a duplex strainer and heat exchanger (if required) and back to the sump. In addition, each aft journal/thrust bearing is equipped with a 25-gallon head tank to provide 3 minutes of emergency lubrication if system pressure drops. The thrust bearing operates in a completely flooded condition with lubrication oil filling up and flowing out of the top of the thrust bearing chamber. Lubrication oil enters the top of the journal bearing via a circumferential groove in the bearing seat. The oil is circulated through the bearing, flows out of each end through the bearing clearance and collects in the bottom of the journal bearing chamber from whence it drains into the oil return piping. The main motor lube oil system uses Mobil DTE Heavy-Medium, MIL-L-17331 (2190 TEP) type oil. The flow rate can be monitored at the bearing and should be adjusted to 1.8 GPM (minimum). The main propulsion motor also contains a self-aligning, self-lubricating Forward Journal Bearing with an independent Lube Oil System. It must be remembered that this lube oil system is independent of the AFT journal and thrust bearing lube oil system and must be checked prior to starting the main propulsion motor and at regular intervals.

Shaft Lube Oil System Each propeller shaft is supported by an inboard Waukesha combination bearing/seal assembly, an intermediate Waukesha bearing assembly and an outboard (strut) Waukesha combination bearing/seal assembly. The bearings and seals are normally force lubricated. Each shaft has its own independent lube oil system consisting of a heated 25-gallon oil sump, rotary gear pump, Simplex strainer, 50-gallon head tank for the bearings an after seal and a 1gallon head tank for the forward seal. Oil under pressure is piped to the outboard (strut) combination bearing/seal assembly and returns to the 25-gallon oil sump via the shaft closure tube, lubricating the intermediate and forward bearings in the process. Location of the head tanks is at a height sufficient to provide a positive static pressure on the seals at all times. Grease filling connections are installed in the vicinity of the forward bearings to provide a standby/emergency source of lubrication. The shaft lube oil system uses Mobil DTE Heavy-Medium, MIL-L-17331 (2190 TEP) type oil.


LUBE OIL FILL AND TRANSFER SYSTEM Storage Tanks The storage tanks, tank numbers 4-60-1 and 4-60-2 are wing tanks located aft of the fuel oil service tanks. They each have a capacity of 5,230 gallons and are filled from a connection either port or starboard on the main deck aft. Transfer Pump. The Lube Oil System has a transfer pump located in the Main Diesel Generator Room, lower level, aft port corner. The pump is a rotary gear type with a capacity of 15 gpm at 35 PSI; it is driven by a 1.5 HP motor using 450 Volts, 3-Phase, 60 Hz power and rotates at 1800 RPM. the pump can take suction from either storage tank and discharge via the eight valve manifold to any of the main diesel engines. Lube Oil Transfer Manifold The manifold has eight (8) valves to route oil to and from each main diesel engine. It is located in the Main Diesel Generator room, lower level, aft port comer. Lube Oil Purifier The Lube Oil Purifier is located in the Main Diesel Generator room, upper level in the aft port comer. It is located on a common sub-base with the fuel oil purifier. The purifiers are supplied with potable water to the bowl closing head tank and to each individual unit. The units are also supplied with ship's service air for valve operation. The purifiers operate on the principles of centrifugal force and difference in specific gravity. The centrifugal force provided by the high revolutions (100-150 RPS) of the purifier bowl acts on all particles proportionally to their specific gravity. This applies to solid particles as well as to fluid particles. The greater the difference in specific gravity, the easier the separation. The bowl has two outlets. The process liquid flows through the distributor to the interspaces between the bowl discs, where the liquid phases are separated from each other by action of the centrifugal force. The heavy phase and any solids move along the underside of the bowl discs toward the periphery of the bowl, where the solids settle on the bowl wall. The heavy phase proceeds along the upper side of the top disc towards the neck of the bowl hood and discharges over the gravity disc - the outer way. The light phase moves along the upper side of the bowl discs toward the bowl center and discharges via the hole in the top disc neck - the inner way. Liquid Seal In a purifier bowl the so-called liquid seal prevents the light phase from passing the outer edge of the top disc, i.e., taking the outer way. Thus, the bowl must be filled with sealing liquid before the process liquid is supplied. The sealing liquid is subsequently forced towards the bowl periphery so as to form a liquid ring confined inwardly by the so-called interface between the light phase and the heavy one. The position of the interface will depend partly on the ratio between the specific gravities of the two liquid phases, partly on the size of the diameters in the inner and outer


inlet. The sealing liquid must be insoluble in the light phase, may be insoluble in the heavy phase and must not be heavier then the heavy phase. Normally, the heavy phase is used as sealing liquid. NOTE: Provided the content of heavy phase in the liquid mixture is sufficiently high (min. 25%), it may in some cases do to feed the process liquid to the bowl. The liquid seal will then build up automatically in sometime. The purifier bowl is adjusted for separation of liquid mixtures with various specific gravity ration by altering the diameter of the outlet for the heavy phase. The heavier or more viscous the light phase and the larger the liquid feed, the smaller the diameter should be. For this purpose a number of gravity discs with various hole diameters is delivered with the machine. Where to dispose the interface depends on which phase should be delivered pure, and on the proportions between the amounts of the two phases as well. If the light phase is wanted more free from the heavy one, the interface should be place nearer the bowl periphery, however not so far from the bowl center that the liquid seal breaks (the gravity disc is too large). The Kings Pointer also uses the lube oil purifier to process fuel oil. In this case we must change the gravity disk to support the specific gravity of diesel fuel. The sludge discharge takes place through a number of sludge ports in the bowl wall. Between discharges, these ports are closed by a large valve slide: the sliding bowl bottom, which constitutes an inner, sliding bottom in the separating space. The sliding bowl bottom is forced upwards against a seal ring by the liquid pressure acting on its underside. During rotation, this pressure increases with the distance from the axis of rotation because of the centrifugal force. The operating liquid exerts an upward pressure exceeding the counter-acting downward pressure from the process liquid, because the underside of the sliding bowl bottom has a larger pressure surface than its upper side. Operating liquid is supplied on the underside of the bowl through a paring disc device. Leakage or evaporation of operating liquids is made up automatically by the paring disc, which maintains a constant horizontal operating liquid level, as its pumping effect neutralizes the static pressure from the supply. The feed of operating liquid through the inner, narrower tube is going on also during the discharge cycle and it is of minor effect. Operating liquid is now supplied through the outer, wider tube so that it flows over the lower edge of the paring chamber and continues through a channel out of the above space above an operating slide. Between discharges, the operating slide is pressed upwards by coil springs. It is now forced downwards by the liquid pressure, thereby opening discharge valves from the space below the sliding bowl bottom so that the operating liquid in this space flows out. When the pressure exerted by the operating liquid against the underside of the sliding bowl bottom diminishes, the latter is forced downwards and opens so that the sludge is ejected from the bowl through the sludge ports in the bowl wall. The operating


liquid on the upper side of the operating slide flows out through a nozzle, This nozzle is always open, but so small that the outflow is negligible in view of the rapid inflow. The coil springs force the operating slide upwards again, which closes the discharge valves from the space below the sliding bowl bottom. Operating liquid is supplied through the outer, wider tube, but only enough to flow to the space below the sliding bowl bottom and force the latter upwards so that the bowl is closed. (Any surplus supply of operating liquid flows through the channel to the operating slide, opening the bowl again). The discharge cycle is accomplished when the outer wider tube is closed and the inner narrower operating liquid intake is still open. The paring disc device counterbalances the static pressure from the operating liquid supply and the sludge discharge cycle is now accomplished. Power Sources.

1. Propulsion Motor Lube Oil Pump No. 1 - Motor Control Center 2A via the ship's service switchboard.

2. Propulsion Motor Lube Oil Sump Heater No. 1 - Lighting Panel L-128-5, Circuit Breaker L-128-5E (No. 5).

3. Propulsion Motor Lube Oil Pump No. 2 - Motor Control Center 2B via the ship's service switchboard.

4. Propulsion Motor Lube Oil Sump Heater No. 2 - Lighting Panel L-128-5, Circuit Breaker L-128-5G (No. 7).

5. Shaft Lube Oil Pump No. 1 - 120 Volt Power Panel P-122, Circuit Breaker P-122-2 via the ship's service switchboard breaker P-422.

6. Shaft Lube Oil Sump Heater No. 1 - Motor Control Center 2A via the ship's service switchboard.

7. Shaft Lube Oil Pump No. 2 - 120 Volt Power Panel P-122, Circuit Breaker P-122-3 via the ship's service switchboard breaker P-422.

8. Shaft Lube Oil Sump Heater No. 2 - Motor Control Center 2B via the ship's service switchboard.

9. Lube Oil Fill and Transfer Pump - Motor Control Center 1A via the ship's service switchboard.

10. Lube Oil Purifier- Motor Control Center 1B via the ship's service switchboard. 11. Lube oil Purifier Heater- Ship's service switchboard, Circuit Breaker No.

P-441.


LUBE OIL PURIFIER SEQUENCE OF OPERATION Depressing the "CONTROL ON" pushbutton 1PB picks up Relay (1 CR) applying 120 Volt power to the INPUT/OUTPUT MODULES, "CONTROL ON" lamp (1LT) illuminates. Depressing the "PURIFIER and/or MACHINE START" pushbutton (3PB) turns on INPUT (11001) and OUTPUT (01200), picking up Relay (2CR) and REMOTE PURIFIER MOTOR STARTER (1M). ACCELERATION TIMER (030) STARTS TIMING. When the machine (bowl) is up to speed, depressing the "SHOOT CON ON" pushbutton (4PB) turns on INPUT (11003). If ACCELERATION TIMER (030) has timed out, INTERNAL CONTROL LOGIC RELAY (01000) AND (01001) are energized, initiating a SHOOT sequence. SHOOT SEQUENCE TIMER (040) starts timing. 1st Action: INTERNAL CONTROL LOGIC RELAY (02101) is energized by SHOOT SEQUENCE TIMER (040) between SET LIMITS of TIMER (040). During these SET LIMITS, OUTPUT (01202) is energized PURGING THE BOWL via the PURGE/PRIME SOLENOID (2SOL). 2nd Action: INTERNAL CONTROL LOGIC RELAY (02102) is energized by SHOOT SEQUENCE TIMER (040) between SET LIMITS of TIMER (040). During these SET LIMITS, OUTPUT (01206) is energized SHOOTING THE BOWL via the SHOOT SOLENOID (4SOL). 3rd Action: INTERNAL CONTROL LOGIC RELAY (02103) is energized by SHOOT SEQUENCY TIMER (040) between SET LIMITS of TIMER (040). During these SET LIMITS, OUTPUT (01201) is energized CLOSING THE BOWL via the CLOSE WATER ON/OFF SOLENOID VALVE (1SOL). 4th Action: INTERNAL CONTROL LOGIC RELAY (02104) is energizing by SHOOT SEQUENCE TIMER (040) between SET LIMITS of TIMER (040). During these SET LIMITS, OUTPUT (01202) is energized PRIMING THE BOWL via the PURGE/PRIME SOLENOID (2SOL). 5th Action: INTERNAL CONTROL LOGIC RELAY (02105) is energized by SHOOT SEQUENCE TIMER (040) between SET LIMITS of TIMER (040). During these SET LIMITS, OUTPUTS (01204) is energized which operates the 3-WAY AIR OPERATED FEED VALVE via the AIR FEED SOLENOID VALVE (3SOL), and energizes the FEED TIMER (FT) DIRECTING OIL THROUGH THE MACHINE. At the same time INTERNAL CONTROL LOGIC RELAY (02105) also de-energizes the SHOOT SEQUENCE INTERNAL LOGIC RELAY (01001) and RESETS itself. When the FEED TIMER (FT) times out, INPUT (11007) turns ON, energizing INTERNAL CONTROL LOGIC RELAY (01001) and SHOOT SEQUENCE TIMER (040) initiating a SHOOT SEQUENCE as described above.


LUBE OIL PURIFIER ALARMS

VIBRATED Excessive machine vibration operates the VIBRATION SWITCH (VS), energizing INPUT (11010) and OUTPUT (01210) and de-energizing OUTPUT (01200). BOWL FLOOD TIMER (033) starts. PURIFIER MOTOR STARTER (1M) de-energizes and drops out, shutting down the machine. To maintain a balance bowl and provide a hydraulic brake, oil continues to flow through the machine until BOWL FLOOD TIMER (033) times cut. "VIBRATED" lamp (2LT) illuminates and the MSCS L.O. PURIFIER “MALFUNCTION" summary alarm will occur.

NO EFFLUENT With oil going through the machine (Output 01204 Energized) a loss of effluent flow from the machine may be caused by anyone of several conditions, including:

• Empty Feed Tank. • Failure of the Feed Pump. • Failure of the Feed Diverter Valve to Operate. • A Plugged Feed Strainer. • Failure of the Bow to Close. • High or Low Back Pressure.

If a loss of effluent flow or high back pressure occurs the PRESSURE SWITCH (NO EFFLUENT or HIGH PRESSURE) will be de-energize INPUT (11012) and energizes ALARM DELAY TIMER (036). If the condition still exists when ALARM DELAY TIMER (036) times out. OUTPUT (01212) energizes and OUTPUTS (01204) and (01205) de-energize. The flow of oil to the machine (if any) is stopped, "NO EFFLUENT" lamp (3LT) illuminates and the MCSC F.O. PURIFIER MALFUNCTION" summary alarm will occur.

Every alarm will energize OUTPUT (01214), picking up RELAY (3CR). A set of contacts open which initiate the MCSC summary alarm "L.O. PURIFIER - MALFUNCTION". Depress the "ANNUN CANCEL" pushbutton (6PB) will energize LOGIC INPUT (11005) and LOGIC LINE (01002). This de-energizes OUTPUT (01214). The MCSC summary alarm will also sound if the "CONTROL ON" pushbutton (1 PB) is depressed and RELAY (1 CR) is not picked up. This indicates failure of RELAY (1 CR) to operate or a power loss. In either case the machine will not operate because the INPUT/OUTPUT MODULES will not have a 120 Volt Source.

To return the machine to normal operation after locating and correcting the cause of the alarm condition, depress the ALARM ANNUN "RESET" pushbutton (7PB), energizing INPUT (11006) which de-energizes output (01210), (01211), (01212) or (01300) and LOGIC LINE (01002). HEATER Depressing the "HEATER ON" pushbutton (8PB) will energize INPUT (11013) and OUTPUT (01215). This will energize and pick up RELAY (4CR) which energizes and picks up HEATER CONTACTOR (1 C), energizing the heater coils. When the oil has heated up to temperature (180F), the TEMPERATURE CONTROL THERMOSTAT (1TS) operates, de-energizing INPUT (11014) and OUTPUT (01215), de-energizing the heater coils.


Normal Sequence (Cycle) After The Purifier Has been Started and Has Gone Through At Least One (1) Complete Cycle. While you observe the operation of the purifier you will hear the relief of air pressure, this signals the end of a purifier cycle. The release of air pressure causes the 3-WAY AIR OPERATED FEED VALVE to go into the re-circulate mode (it's valve stem will move upward), which re-circulates the lube oil or fuel oil back to the tank it is being pumped from. The OUTPUT PRESSURE GAUGE will indicate 0 psig, and the output FLOW METER will indicate 0 flow. Next you will hear the PURGE/PRIME SOLENOID VALVE (2SOL) click and observe the little red ball rotate around and around in the FLOW INDICATOR and a short time the little red ball will stop. This is the "PURGING THE BOWL" action. Next you will hear the SHOOT SOLENOID VALVE (4SOL) click. You will see water shooting up through the WATER OUTLET SIGHT GLASS (clear plastic tube), at the same time you may observe a small amount of air bubbles in the FLOW INDICATOR. You will also hear a loud buzzing noise which fades in and then fades out. This is the "SHOOTING THE BOWL" action. Next you wilt hearths WATER ON/OFF SOLENOID VALVE (1 SOL) click. This is the "CLOSING THE BOWL" action. Next you will hear the AIR FEED SOLENOID VALVE (3SOL) click and you can observe the 3-WAY AIR OPERATED FEED VALVE's stem moving downward. This is the "DIRECTING OIL THROUGH THE MACHINE" action. You can also observe the OUTPUT PRESSURE GAUGE, which should indicate approximately 23 psig at the same time you will be able to see the output FLOW METER indicating flow. During this action you may also notice a foamy mixture going down through the WATER OUTLET tube. This is the water that is being taken out of the lube oil or fuel oil during purification. The "DIRECTING OIL THROUGH THE MACHINE" (feed) action will continue until the FEED TIMER times out. The feed time is inside the control panel and is set by you. When the FEED TIMER times out, you will hear the air being released from the 3-WAY AIR OPERATED FEED VALVE and the above cycle repeats itself over again and again.


LUBE OIL AND FUEL OIL SYSTEMS Equipment Data:

I. Lube Oil Fill Transfer System. a. Components:

(1) Motor (a) 1 1/2 horsepower (b) 440 Volt (c) 3-Phase (d) 60 Hertz (e) 1800 RPM (f) U.S. Motors

(2) Pump (a) Rotary Gear (b) 15 gpm at 35 PSI

b. Manifold: (1) 8-valve (2) Supply and Return

c. Storage Tanks: (1) #4-60-1 and #4-60-2 (b) 5,230 gallons each

II. Propulsion Motor Lube Oil System a. Components:

(1) Motor: (a) 1 1/2 horsepower (b) 440 Volt (c) 3-Phase (d) 60 Hertz (e) 1800 RPM (f) U.S. Motors

(2) Pump (a) Rotary Gear (b) 5 gpm at 35 PSI

(3) Head Tank, 25 gallon (4) Sump, 50 gallon

b. Supplies (1) Aft Journal Bearing (2) Thrust Bearing (3) L.O. Cooler with Thereto Valve

III. Fuel Oil System a. Components:

(1) Motor: (a) Shaft horsepower (b) 440 volt (c) 3-phase (d) 60 Hertz (e) 1800 RPM (f) General Electric

(2) Pump (a) Rotary Gear


(b) 90 GPM @ 50 psig (3) Fuel Oil Manifolds

(a) #14, and #12 valve forward/aft. (b) Isolation valves 4-12-0, 4-12-1, 4-12-2, 4-18-0 (c) Isolation valves on all fuel oil storage tanks

IV. L.O. & F.O. Purifiers: a. Capacity:

(1) L.O. - 500 gph (2) F.O. - 750 gph

b. Electrical Data (1) 440 Volt (2) 60 Hertz (3) 3-Phase (4) Lube Oil Heater- 36 KW (5) 440 Volt (6) 60 Hertz (7) 3-Phase

lube oil system.pdf

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