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  • Instant indication of condition for motor bearings, gears, compressors, slewing rings, hoists, winches...

  • Plan maintenance and have the spares available on time. Minimise off-hire and demurrage.
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Typical Test Limits

Diesel Engine OilKey Test Parameters

FuelViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)
Automotive

Distillate<+/-15%2.00+4 from New Lube<20.30180°
High Speed

Distillate<+/-15%2.00+4 from New Lube<20.20180°
Medium Speed

Distillate<+/-15%3.00+4 from New Lube<30.20180°
Medium Speed

Residual<+/-15%3.00+4 from New Lube<120.20180°
Slow Speed

Residual<+/-15%3.00+4 from New Lube<50% of starting value0.20180°
Gear Oils

Oil ConditionViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)

Satisfactory<+/-15%<0.54.0 beyond New Lube Ref.n/a0.05-0.15n/a

Exceeds Limit>+/-20% nom>0.95.0 beyond New Lube Ref.n/a>0/20n/a
CommentViscosity increase is more common than decrease. It should be noted and checked at more frequent intervals. Check that the correct grade of oil is used for top-up.
Upper water limit should be checked against manufacturers data. Some oils cannot tolerate water - BEWARE. Synthetic oils can be less tolerant than most.
AN should always be monitored by trend as the AN on some oils can call from new then rise again as the oil ages.
Hydraulic Oil

Oil ConditionViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)

Satisfactory
0.01-0.2Determine Baselinen/a0.05-0.15n/a

Exceeds Limit<+/-10% nominal>0.4>0.9 beyond New Lube Ref.n/a>0/20n/a
CommentViscosity increase is more common than decrease. Check that the correct grade of top up is used.
Upper water limit should be checked against manufacturers data. Some systems/oils are very intolerant of water. Beware! - data not applicable to fire retardant fluids.
AN should always be monitored by trend as the AN of some oils call from new then rise again as the oil ages.
Hydraulic systems can be extremely sensitive to dirt. Cleanliness and hygeine are paramount.
Gas Engines

Oil ConditionViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)
Medium Speed


>25%2.50>3 from New Lube2.5 Decrease from new (4-stroke)

Natural Gas
100°

Exceeds Limit>25%1.00>2 from New Lube2.5 Decrease from new (4-stroke)0.20180°
Lean Burn 40°

Exceeds Limit>25%1.00>2 from New Lube2.5 Decrease from new (4-stroke)0.20180°
Comment

Number in title denotes viscosity test temperature.
Compressors

Oil ConditionViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)

Satisfactory<+/- 15%<0.5Within 2 of New Luben/a0.05-0.10

Exceeds Limit>20% nom>0.7>2 of New Luben/a>0.10
CommentA viscosity increase is more common than decrease. It should be noted and checked at more frequent intervals. Check that the correct grade of oil is used for top-up.
Water can enter the oil via the compressor cylinders; always check that inter-cooler drains are operated effectively. Refridgeration oils cannot tolerate water at all.
Insolubles are formed by carbon from oxidised oil, high insolubles will rapidly foul air delivery valves.
AN should always be monitored by trend as the AN of some oils can fall from new then rise again as the oil ages.
Turbine Oil

Oil ConditionViscosity
cSt at 40°C)
Insolubles
(%)
AN
(mg.KOH)
BN
(mg.KOH)
Water %Flash Point
(°C)

Satisfactory<+/- 10% nominal
Determine Baselinen/a0.15n/a

Exceeds Limit±15% changeIncrease of 0.6 from nominaln/a>0.20n/a
CommentViscosity increase more common than decrease. Check grade of top up oil.
Many steam turbine oils are tolerant of water by design.
AN should always be monitored by trend as the AN of some oils can fall from new then rise again as the oil ages.

On & Off-line Lube Oil

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