7.8 Lube Oil - 7.8 Lube Oil

Question 1

2190 Lube Oil characteristics

Answer 1

Excellent demulsibility
Contains additives
-Anti-oxidant, anti-foam, anti-corrosives
-Stable at high temperatures
-High viscosity index (95-100 range)

Question 2

2190 Lube Oil Uses

Answer 2

MRG
Low, medium, and high pressure air compressors
Line shaft bearings
Controllable pitch propellers
Steam Turbines

Question 3

Equipment with online purification

Answer 3

Main Engines (steam ships only)
Main Reduction Gears (MRGs)
Kingsbury Thrust Bearing (KTB)
Controllable Reversible Pitch (CRP)/
Controllable Pitch Propeller (CPP)

Question 4

Purifier Efficiency Test

Answer 4

Inlet v. Outlet

Outlet cleaner than the inlet: SAT
Outlet not cleaner (looks worse) than inlet: UNSAT
-Stop and clean the lube oil purifier

Question 5

Equipment without online purification

Answer 5

Line Shaft Bearings (LSBs)
High Pressure Air Compressors (HPACs)
Low Pressure Air Compressors (LPACs)

Question 6

Transparency Test

Answer 6

PMS card can be read behind the L/O bottle = SAT

Question 7

Visible Sediment Test

Answer 7

Stand for 10 minutes (or until all of the sediment has settled to the bottom)
Side for 10 minutes (or until all of the sediment has accumulated along the intersection of the side)

UNSAT Sample if:
-Solid, unbroken line or
-Individual particles greater than 1/8”

Question 8

Fill, Transfer & Purification System

Answer 8

Stores, transfers, and purifies, and preheat lube oil for MRG & CRP use

Gravity Riser connections
-Top side to bring on new lube oil
Storage Tanks
-Clean oil is stored until needed
Settling Tanks
-Oil is sent for batch purification

Question 9

Lube Oil Tanks

Answer 9

Receive and store lube oil for future use

Question 10

L/O Settling Tanks

Answer 10

Recondition emulsified oil by heating & allowing impurities/ water to separate from the oil
Temporarily store oil from the CRP/MRG sump when the sump must be emptied for cleaning or inspection

Question 11

L/O Purifiers

Answer 11

1 L/O Purifier per Main Engine Room (MER)
Features:
-Vertical belt driven centrifugal separator
-Bowl speed: 8500 RPM
-Self cleaning feature
Purpose:
-Purification of the preheated MRG & CRP L/O sump
-Transfer 2190 L/O from/to storage/settling tanks from/to MRG/CRP sumps

Question 12

MRG Lube Oil Service System

Answer 12

Lubricates and cools the MRG components, clutch and brake assemblies, and the main thrust bearings
Prevents friction and wear
Prevents corrosion

Question 13

MRG Sump

Answer 13

Stores oil for use in the service system
Located underneath the MRG

Question 14

MRG L/O Service Pumps (LOSP)

Answer 14

2 electric motor driven LOSPs per Main Engine Room (MER)
1 attached LOSP

Question 15

MRG Cooler

Answer 15

L/O Cooler
Single pass shell and tube type heat exchanger
Sea water is the cooling medium
Air pilot regulator valve
Normal L/O Header Temp: 110F ± 5F

Question 16

MRG Duplex Strainer

Answer 16

Consists of 2 steel mesh strainers enclosed in a spray proof box
Usually contains a built-in pressure relief valve to bypass all the oil around the strainer in the event of clogging
In duplex strainers, the element being by-passed can be removed and cleaned without disturbing the flow

Question 17

MRG Unloader Valve

Answer 17

System pressure operated diaphragm, non-pneumatic valve

Maintain MRG lube oil header pressure
-Header Press Low
-Header Press High
Unloads excess Lube Oil in system back to the Lube Oil sump