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Cleanliness of oil and Filtration

Contamination classes ISO 4406Function and purpose of oil

Contaminations and consequencesGears and rollers

Off-line filter systems

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Contamination classes ISO 4406

Remark: each class doubles/halves the amount of particles.

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Function and purpose of oil

• Transmitter (hydraulic pressure=energy)• Lubrication (countering friction)• Cooling (heat conveyor)• Dispersion(carrier of contaminations)

• Conservation (preventing corrosion)

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Contaminations and consequences

Contaminations:• Water (ingress, condensation, leakage)

• Dirt (ingress, aeration)

• Metals (wear and tear)

• Resin (thermal load)

• Oxidation(catalytic results of contaminations)

Consequences:• Loss of lubricating ability• Diminished dispersion• Isolation and sticking of

components• Corrosion

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Criteria for oil sampling reports

• Viscosity (cSt = centiStoke)

• Water content (ppm: parts per million)

• T.A.N. (Total Acid Number)

• Contamination class acc. to ISO 4406:99(particle counting of 4, 6 and 14 micron)

• Spectral analysis (e.g. additives in oil)

• Particle identification

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Test membranes

Test membranes and ISO code 4406.

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high degree of sliding at start of mesh

pure rolling onlyon the pitch line

high degree of slidingat mesh exit

Basic principle of gearsExxonMobil: Mr. Per Holm> Gear seminar, Svendborg, May’02

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Example of gear abrasion

Crest

Root

Abrasion of gear at the initial phase.

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Bearings and rollers

Particles (2-5 micron) withindynamic tolerance of a mechanical part.

“Grinding” of particles on the surfaces creating micro-cracks and pitting, which are then prone to erosion.

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Example of bearing abrasion(1)

Grinding of particles between components.

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Example of bearing abrasion(2)

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Filter fundamentals

‘In-line’: using the pressure or flow of the system such as suction-, pressure-, return- and bypass filters.‘Off-line’: from the tank through the filter and back in the tank by means of separate pump with constant flow.

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CJCTM Filter systems

Specifications and strong points:

1. Filter pore size of 0.85 micron.2. Large contaminations holding capacity, for example B 27/27 holds

upto 2 litres of water and 4 litres of particles.3. The cellulose material adsorbs resins.4. Several separation technologies: Absorption, Separator-coalescing,

Vacuum and Desorption (extraction).5. World wide service, establishment and distributors (www.cjc.dk).6. Established goodwill, knowledge and experience in oil filtration.7. Specialized in ‘off-line’ systems.8. Reliable and users friendly.

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CJC Filter units

CJC FineFilter HDU 27/54 GP-EPT

CJC Desorber D38

CJC FineFilter HDU 27/27 P

CJC VacuumFilter V30

CJC FilterSeparator PTU2 27/27 PV-EPW

CJC FineFilter HDU 15/25 PV

CJC FineFilterHDU 27/27 P-EM