Oil checks pdf

Yew Kwang - Oil checks -19/06/14- slide 1
USED OIL ANALYSIS & INTERPRETATION
How to sample engine oil
•
Take sample while engine is hot & well mixed
•
Take sample before the oil filter
•
Last resort from drain plug, deposits accumulate
in that area
•
Prevent contamination of oil sample
•
Use new clean container
•
Take samples the same way each time
•
Follow sampling schedule
•
Label correctly, date, engine no.,Hours of
operation, the last time new oil is topped up.
•
Sent promptly to lab
Yew Kwang - Oil checks -19/06/14- slide 2
OIL DRAIN & SAMPLING INTERVALS
Equipment Type Drain Interval Sampling
Interval
Sampling Point Remarks
Propulsion
Machinery
Trunk piston

engines
Steam Turbines
Depending on oil
condition
Depending on oil
condition
6 months
12 months
Before centrifuge*
or
Before filter or at
lube purifier
discharge
Drain period can be
extended in case of
correct engine
operation and
maintenance and
proper lube oil
purification
Auxiliares
Diesel engines Follow
equipment
manufacturers
instruction
12 months Preferably before
filter
L/W [2400/(0.85+S)]
L=sump cc in litres
W=engine load in KW

S=%fuel sulfur content
Turbines for
generator and
cargo pumps
Follow
equipment
manufacturers
instruction
12 months Preferably before
filter
*Sample after centrifuge should only be landed and analysed for water in case of gross water contamination, or in
case of rapid increase of insolubes to check purifier efficiency.
Yew Kwang - Oil checks -19/06/14- slide 3
OIL DRAIN & SAMPLING INTERVALS
Equipment Type Drain Interval Sampling
Interval
Sampling Point Remarks
Main reduction
gears
Follow
equipment
manufacturer’s
instruction
2 years or
8000 hours
when system
contains more
than 4000
litres
Preferably

before filter
Turbo Blowers
1) With integral
oil feed
2) With separate
sump tank
Follow
equipment
manufacturer’s
instructions
1) No
sampling
2) 2 years
1) None
2) Preferably
before filter
1) Sump cc 1-35
Drain period
normally 500-
1000 hours.
2) Sump cc-
2000 litres
Air and
refrigeration
compressors
Follow
equipment
manufacturer’s
instructions
No sampling None

Yew Kwang - Oil checks -19/06/14- slide 4
OIL DRAIN & SAMPLING INTERVALS
Equipment Type Drain Interval Sampling
Interval
Sampling Point Remarks
Hydraulic
systems
4-8 years or
depending on oil
condition
2 years when
system
capacity more
than 1500 l.
Preferably
before filter
Heat transfer
systems
4-8 years or
depending on oil
condition
2 years when
system
capacity more
than 1500 l.
Preferably
before filter
Others Follow
equipment
manufacturer’s

instructions
No sampling None