Temperature variations between operation and standstill, the volume of air is constantly changing in a transmission. Sucked, moist ambient air reduces the service life of a gear oil significantly. Furthermore, leads moisture in the housing to corrosion with particle abrasion and thus damage to the transmission.
Good gear ventilation filters prevent the entry of humidity in the "breathing" of the transmission. GIEBEL Adsorber® are special gear ventilation Water filters for ventilation. So this breathing dryers are used for example in coastal areas, offshore, in tropical regions, and underground with success.
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FORMATION OF WATER IN GEARS
Gears WITHOUT Adsorber
-> Use of a ventilation filter without desiccant
Ambient air enriched with moisture
Transmission cools down Oil level drops Pressure equalization by incoming air
-> Inflowing air humidity according to ambient air!
Transmission warms up again
Oil level is rising
Pressure equalization by outflowing moist air
Cooling of the ambient air below dew point
-> Emergence condensation in the interior -> Drops form and water flows into the transmission
FUNCTIONAL GEARS - HUMIDITY AND DEW POINT
Transmission of forces, torque and energy! -> Pressure equalization with ambient air
Air intake from the environment
due to temperature fluctuations
Absolute Humidity Content of water vapor Relative Humidity Percentage to maximum humidity
Example Temperature = 20°C Air humidity = 80% rF
-> Water 13.8g/m³ -> Dew point 16,4°C
-> Permissible temperature range = 3,6°C
DAMAGE CAUSED BY WATER
„80% of particles and water are the cause of malfunctions and damage in hydraulic systems, gearboxes and rolling bearings““
Consequences:
Hydrolyse – Rapid aging and degradation of additives
Promotion of corrosion
Worselubrication
AVOIDANCE OF WATER IN GEARS
GearsWITH Adsorber
-> Use of an adsorber with desiccant
Ambient air enriched with moisture
Transmission cools down Oil level drops Pressure equalization by incoming air Moisture is separated
-> Incoming Humidity about 10% rH!
Transmission warms up again Oil level is rising Pressure equalization by outgoing dry air
Cooling of the ambient air below dew point -> No condensation inside -> No drops of water -> No water in the transmission
Adsorber lowers the air humidity to below 2%RH and the dew point to below -40°C
Humidity after Adsorber average 10% rH Content of water: 1,7 g/m³ Dew point: -12,5°C
EXAMPLES OF USE
Sewage Plant Task: Moving the rotary pool Operation: continuous, outdoor use
-> Application Adsorber ME 3M-RV
Hydropower Plant Task: Ventilation of turbines, protection against oil mist Operation: continuous operation, evaporating oil particles
-> Application Adsorber VG 5L-D
Radio Teleskope Task: Rotate the radio telescope Operation: Rarely used, outdoor use
-> Application Adsorber VV 3M-RV
Ships Task: Drive of a ferry Operation: continuous operation, protection against evaporating oil particles
-> Application Adsorber VG 5L-D
Sugar Factory Task: e.g. drive of the cossette press Operation: Continuous use during campaign, high humidity and temperature fluctuation
-> Application Adsorber MA 3M-RV
Elevator Task: Lifting the drill pipe out of the ground Operation: Continuous operation Offshore
-> Application Adsorber ME 3L-DV
Mining Task: Drive of the conveyor system Operation: Continuous operation, very dusty and humid
-> Application Adsorber MA 3M-RV
Wind Turbine Gearbox Task: Transfer of the energy of the blades to the generator Operation: Continuous operation, maintenance interval annually
