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Questions and Answers
Why is it critical to prevent any lubricating oil leaks in the described system?
Why is it critical to prevent any lubricating oil leaks in the described system?
Oil leaks can prevent adequate lubrication of high and low-pressure points, potentially damaging the packing and causing a loss of containment.
Describe the flow path of the crankcase oil, starting from the D-140 source to its return to the C-120A/B Crankcase Frame Oil Reservoirs.
Describe the flow path of the crankcase oil, starting from the D-140 source to its return to the C-120A/B Crankcase Frame Oil Reservoirs.
Crankcase oil flows from D-140 to C-120A/B, then is pumped by P-122A/B-1 through E-122A/B-1 or E-122A/B-2 for cooling. It then goes through F-122A/B-1 or F-122A/B-2 for filtration before lubricating the main and outboard bearings of CM-120A/B, finally returning to C-120A/B.
What is the purpose of P-122A/B-2 (Auxiliary Lube Oil Pumps) in the described system?
What is the purpose of P-122A/B-2 (Auxiliary Lube Oil Pumps) in the described system?
To maintain lube oil flow during start-up and stand-by service.
In the context of the lubrication system, what is the purpose of the hand pump, and under what circumstances is it used?
In the context of the lubrication system, what is the purpose of the hand pump, and under what circumstances is it used?
Explain the purpose of cooling water in CM-120A/B, and describe its flow path before reaching the piston and tail rods.
Explain the purpose of cooling water in CM-120A/B, and describe its flow path before reaching the piston and tail rods.
Flashcards
D-140 Function
D-140 Function
Provides makeup oil to the crankcase frame oil reservoirs.
E-122A/B-1 & E-122A/B-2 Function
E-122A/B-1 & E-122A/B-2 Function
Cool crankcase oil using cooling water.
P-122A/B-2 Function
P-122A/B-2 Function
Maintain lube oil flow during start-up and standby.
F-122A/B-1 & F-122A/B-2 Function
F-122A/B-1 & F-122A/B-2 Function
Filter crankcase oil before it reaches main bearings.
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P-121A/B Function
P-121A/B Function
Lubricate piston rods and cylinders.
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- Crankcase oil flows from D-140 to C-120A/B Crankcase Frame Oil Reservoirs as make-up.
- P-122A/B-1 (C-120A/B Main Lube Oil Pump) sends crankcase oil to the shell side of E-122A/B-1 or E-122A/B-2 (C-120A/B Lube Oil Coolers).
- Cooling water cools the oil in the lube oil coolers on the tube side.
- P-122A/B-2 (Auxiliary Lube Oil Pumps) provide start-up and standby service.
- Crankcase oil goes through F-122A/B-1 or F-122A/B-2 (Lube Oil Filters) before reaching the main bearings and outboard bearings of CM-120A/B (Motor Drives).
- The returning crankcase oil goes back to C-120A/B Crankcase Frame Oil Reservoirs.
- Cooling water goes to CM-120A/B cylinders #1 and #2.
- Cooling water also passes through F-123A/B-1 or F-123A/B-2 (C-120A/B Packing Cooling Water Filters) before going to CM-120A/B piston rods and tail rods.
- P-121A/B (Lubricator Pumps for C-120A/B) deliver lubricating oil to the rod packings and cylinders of C-120A/B.
- A hand pump maintains lubrication when P-121A/B are offline, isolated when not in use.
- Vents on the discharge of P-121A/B are used for inventory or to remove air from the system.
- Lube oil leaks are unacceptable as it may cause damage to the packing, leading to loss of containment.
P-122A/B-1 (C-120A/B Main Lube Oil Pump)
- Positive displacement pumps displace a fixed volume of liquid per cycle, maintaining constant flow regardless of discharge pressure.
- Types of positive displacement pumps include diaphragm, piston, screw, gear, and vane pumps.
- P-122A/B-1 are crankshaft-driven positive displacement pumps.
- P-122A/B-1 routes lube oil to C-120A/B.
P-122A/B-2 (Auxiliary Lube Oil Pumps)
- Centrifugal pumps use a spinning impeller to increase fluid speed and convert it to pressure.
- Fluid enters at the impeller centerline and is flung outwards by vanes.
- The volute, a widening passage, slows the fluid, converting its energy to pressure before discharge.
- P-122A/B-2 are single-stage centrifugal pumps.
- They're driven by 10 HP, 1750 RPM horizontally-mounted induction electric motors.
- P-122A/B-2 route lube oil to C-120A/B if P-122A/B-1 fails.
E-122A/B-1 (C-120A/B Lube Oil Coolers) & E-122A/B-2 (C-120A/B Lube Oil Coolers)
- E-122A/B-1 and E-122A/B-2 are multi-tube, U-type heat exchangers.
- They cool lube oil on the shell side using cooling water on the tube side.
- Their purpose is to cool the lube oil.
F-122A/B-1 (Lube Oil Filters) & F-122A/B-2 (Lube Oil Filters)
- F-122A/B-1 and F-122A/B-2 remove contaminants from the lube oil.
F-123A/B-1 (C-120A/B Packing Cooling Water Filters) & F-123A/B-2 (C-120A/B Packing Cooling Water Filters)
- F-123A/B-1 and F-123A/B-2 remove contaminants from the cooling water.
P-121A/B (Lubricator Pumps for C-120A/B)
- P-121A/B are camshaft-driven piston pumps.
- They are powered by 10 HP 1750 RPM vertically-mounted induction electric motors.
- The pumps deliver lube oil to C-120A/B rod packings and cylinders.
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