 Underpressure filter series UPF 101-1000
Venting the central lubrication oil tanks of gas and
steam turbines
The UPF 101-1000 is suitable for venting the central lubrication oil tanks of gas and steam turbines. The UPF 101-1000 series has been developed specially for the venting of oil tanks, large plain bearings and gearbox cases. The field of use comprises oil tank volumes of 1,500l up to 65,000l. In gas and steam turbines there are central lubrication oil systems to supply the turbine bearings. The pressure built up in the oil tank prevents the oil mist from penetrating the pipes, bearings, labyrinth glands and case slots.
Due to the permanent flowing-off of the oil mist the filter cartridges of stage one are self-cleaning, hence they need no maintenance and therefore they have a long service life of several years. The service life of the filter cartridges of stage two is 8,000 – 16,000 hours. With a precipitation degree of 99.97% by 0.3μm and a low residual quantity of less than 5mg/m³ downstream of the filter the legal limit values are strictly observed. 
Underpressure filter series UPF 20-305
Filters for closed-loop venting of crankcases
UPF 20-305 is suitable for closed-loop venting of crankcases of diesel and gas engines (without fans). The UPF 20-305 series has been developed specially for the closed-loop venting of crankcases. The field of use comprises motors of 150kW up to high-power CHP plants with 9MW.
The UPF filters are designed so that they can be operated by the turbo-supercharger of the engine. A membrane gas controller on the unit holds the crankcase exactly at -1mbar under-pressure, even with variable operating conditions. For safe functioning of the control and in order to avoid an unacceptable pressure rise in the crankcase, our filter has a very low pressure loss of 3mbar - 5mbar.
The multistage oil precipitation has a high oil separation degree (99.97% by 0.3μm). UT99 guarantees a very low residual oil quantity of less than 1.0mg/m³ downstream of the filter. Thus sediment in the turbo-supercharger and supercharge air cooler are prevented. This is essential for highly efficient gas engines. The high temperatures in the turbo-supercharger bake major residual oil quantities, severely impairing smooth functionality.
The service life of the stage one filter cartridges is several years and the service life of stage two is 4,000 – 8,000 hours depending of load.
Underpressure filter series UPF 65-355
Filters for open-loop venting of crankcases
UPF 65-355 is suitable for open-loop venting of crankcases of diesel and gas engines. The UPF 65-355 series has been developed specially for the open-loop venting of crankcases. The field of use comprises engines of 150kW up to high-power CHP plants with 9MW.
In internal combustion engines, combustion gases always enter between the piston rings and the sleeve in the crankcase (blow-by). Without venting, these combustion gases will cause an unacceptable pressure increase in the crankcase. These gases must not be blown off into the environment.
The UPF filters are operated by an additional fan. The electronic PID control with pressure transmitter and frequency converter placed on the unit holds the crankcase exactly at -1.0mbar under pressure, even with variable operating conditions. For safe functioning of the control and in order to avoid an unacceptable pressure rise in the crankcase, our filter has a very low pressure loss of 3mbar - 5mbar.
The multi-stage oil precipitation has a high oil precipitation degree (99.97% by 0.3 μm). UT99 guarantees a very low residual oil quantity of less than 5mg/m³ downstream of the filter.
Service life of the stage 1 filter cartridges is several years. Service life of the filter cartridges is 8,000–16,000 hours. With a precipitation degree of 99.97% by 0.3 μm and the low residual quantity of less than 5mg/m³ downstream of the filter the legal limit values are strictly observed.
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