Filtration Value; Safety And Health Measures Regarding The Use Of Hydraulic Oil; Storage - Kramp MPP Manuel D'utilisation

6.3. Contamination
1
Sources and effects of contamination:
Contamination source
Air
UK
Water
Temperature too low
Temperature too high
Dirt particles
6.3.

Filtration value

2
Filter performance is expressed in the beta ratio. The higher this ratio, the better the filtration. The beta ratio can be
converted into a measure of efficiency, expressed as a percentage. This method is generally accepted in the sector.
In practice, a beta ratio equivalent of 75 is used.
6.3. Filter fineness
3
In the end, the fineness and material of the filter determine whether the system meets the requirements of the cleanliness
class in question in combination with a beta ratio equivalent of 75. Filter elements are usually made from paper or fibreglass.
Fibreglass filters meet virtually all the relevant requirements.
Application
Servo systems / High-pressure systems
Die-casting machines
Proportional valves / Industrial hydraulics
Mobile hydraulics / General mechanical
engineering / Medium-pressure systems
Low-pressure systems / Heavy industry
Water hydraulics
6.3.

Safety and health measures regarding the use of hydraulic oil

4
Anyone working on installations where hydraulic oil, lubricating oil, grease or preservatives are used must observe the
following rules:
• Do not let the skin come into prolonged contact with the fluid. Clean the skin carefully after contact. Wear dry clothing.
Do not eat or drink during the work.
• Do not let the skin come into contact with hot machine components or fluids above 60°C.
• Avoid contact with the eyes. Should this occur, flush with copious amounts of water and contact a physician.
• Fluids must be stored in accordance with official regulations. Fire-extinguishers and emergency exits must be present.
• In the event of a fire hazard, it is sensible to use a highly incombustible fluid.
• Any fluid spilled should be cleaned up immediately to prevent slipping.
• Fluids may not end up in the ground or in surface water.
• Concrete floors must be impervious to fluid.
• Waste fluid must be removed and recycled by a specialist firm.
• Never attempt to plug leaks in the system by hand.
6.3.

Storage

5
Hydraulic fluid must be stored in spaces that meet applicable legal standards. The temperature must be kept as constant as
possible to avoid condensation. Ensure sufficient circulation of stock. Opened drums must be closed to avoid contamination
and condensation.
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Effect
Cavitation / Diesel effect' combustion / Hydraulic oil becomes compressible /
More noise produced
Oil ages more quickly / Oil produces foam more quickly / Negative effect on lubricating
properties
Increase in viscosity / Danger of cavitation / Increased resistance in pipes and valves / Delay in
control valves /Decrease in yield / Substantial pressure loss in filters, resulting in opening of
by-pass valves or tearing of filter elements
Decrease in viscosity / Oil ages more quickly / Thickness of lubricating film may decrease /
Increase in internal leakage / Decrease in yield / Negative effect on properties and functions of
gaskets
Extreme wear of components / Clogging of choking elements / Energy loss as a result of internal
leakage / Valves become increasingly difficult or impossible to control
Recommended degree of cleanliness
ISO 4406
15/11
16/13
18/14
19/15
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NAS 1638
4 - 6
7 - 8
8 - 9
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Filter fineness Filter element
Beta ratio Fibreglass (A)
equivalent of 75 Paper (P)
6 A06
10 A10
16 A10
25 A25