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Questions and Answers
Where are the Prairie and Masker Air Coolers located?
Where are the Prairie and Masker Air Coolers located?
Which of these systems is NOT controlled on all 4 UCCs?
Which of these systems is NOT controlled on all 4 UCCs?
What is the function of the Priority Valves?
What is the function of the Priority Valves?
What is the normal operating pressure of the LPAC in Lag Mode?
What is the normal operating pressure of the LPAC in Lag Mode?
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Where are the LPACs located?
Where are the LPACs located?
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What is the primary function of the Main L/O system?
What is the primary function of the Main L/O system?
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How does the Main L/O system interface with the Gas Turbine L/O system?
How does the Main L/O system interface with the Gas Turbine L/O system?
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What is the function of the L/O service pumps?
What is the function of the L/O service pumps?
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Where are the L/O settling tanks located?
Where are the L/O settling tanks located?
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What is the function of the L/O cooler?
What is the function of the L/O cooler?
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Which of the following is NOT a function of Bleed Air?
Which of the following is NOT a function of Bleed Air?
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Where is Bleed Air extracted from in the Main Engine (LM2500)?
Where is Bleed Air extracted from in the Main Engine (LM2500)?
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From which stage of the SSGTG (501-K34) compressor is Bleed Air extracted?
From which stage of the SSGTG (501-K34) compressor is Bleed Air extracted?
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Flashcards
Main L/O system purpose
Main L/O system purpose
The main purpose is to cool and lubricate the Main Reduction Gear and associated subsystems.
L/O Service Pumps
L/O Service Pumps
Two service pumps located in MER1 and MER2 that provide lube oil pressure at higher SRPM.
L/O Cooler function
L/O Cooler function
Cools Main Reduction Gear Lube Oil (2190) using seawater via a shell and tube cooler.
L/O Heater purpose
L/O Heater purpose
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L/O Storage Tanks
L/O Storage Tanks
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L/O Settling Tanks
L/O Settling Tanks
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Bleed Air function
Bleed Air function
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Source of Bleed Air
Source of Bleed Air
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Bleed Air Monitoring
Bleed Air Monitoring
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LPAC Usage
LPAC Usage
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LPAC Location
LPAC Location
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Normal Operating Pressures
Normal Operating Pressures
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Priority Valves Function
Priority Valves Function
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Study Notes
Main L/O System
- Purpose: Cool and lubricate the Main Reduction Gear and associated subsystems.
- Interfaces with: Gas turbine L/O system, Main Reduction Gears, and Main Thrust Bearing.
- Gas turbine L/O system: Cools synthetic L/O via shell and tube cooler.
- Main Reduction Gears: Cools and lubricates these gears.
- Main Thrust Bearing: Cools and lubricates the bearing.
L/O Components
- L/O Service Pumps: Two pumps (LOSP's) are attached.
- Function: Provide L/O pressure at higher speeds.
- Redundancy: Includes standby pumps (1A, 1B in MER1; 2A, 2B in MER2) for backup.
- L/O Cooler:
- Function: Cools MRG L/O with seawater using shell and tube coolers.
- Location: Inboard side of MRG, in MER1 and MER2.
- L/O Heater:
- Function: Heats oil to reduce viscosity for easier cleanup.
- Location: In MER1 next to lube oil purifier; in MER2 next to HOPM.
- L/O Storage Tanks: Six tanks
- Location: Three in MER1 and three in MER2, outside.
- Function: Stores L/O for equipment use.
- L/O Settling Tanks: Four tanks
- Location: Two in MER1 and two in MER2, outside.
- Function: Separates particulate matter for settling.
Bleed Air
- Source: Extracted from 16th stage compressor of the main engine (LM2500) and 14th stage compressor of the SSGTG (501-K34).
- Monitoring/Control: Controlled and monitored on all 4 UCC except Anti-Icing. Anti-Icing is locally controlled.
- Uses:
- Start-up
- Propeller signature masking
- Anti-icing: Prevents ice build-up in intake system.
- Masker Air: Masks ship's equipment signature.
SEC 118 Compressed Air Fundamentals
- LPAC (Low Pressure Air Compressor):
- Uses: Various ship systems, tools, valves, cooling, etc.
- Location: One RIX STAR 200 in Mer1, two in Mer2.
- Air Dehydrators:
- Three per LPAC, one per system.
- Location: Next to associated LPACs.
- Function: Removes moisture from LP air.
Priority Valves
- Location: Two are present, generally located in MER1 and MER2.
- Function: When utilizing non-vital air, priority valves fully shut and direct all air to essential systems (e.g., wave guides, Leslie valves, dampeners).
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Description
Explore the critical components and functions of the Main L/O System. Learn how the system cools and lubricates vital machinery such as the Main Reduction Gear and Thrust Bearing. This quiz covers the purposes of various components, including service pumps, coolers, heaters, and storage tanks.
