FRIESS-EFR D2 used for cleaning the hydraulic oil of an hydraulic elevator
Mr. Friess, the former managing director of our company, was in contact with the property management of an apartment building in which a hydraulically operated elevator is installed. After 23 years of use, the service company wanted the oil to be analyzed and, depending on the results, replaced. Due to an “interesting” quote in terms of pricing and delivery time from the service company, Mr. Friess decided to take matters into his own hands.
Problem
Without further ado, he carried out the analysis himself using our test kit. He noticed that the oil had a high level of varnish and a moderate particle load.
The oil used in the system was an HLPD oil. This oil differs from regular HLP oils in that additional additives are used to keep dirt and water in suspension in order to protect the system. This type of oil is often used in mobile hydraulic systems or hydraulic systems that are exposed to high temperature fluctuations so that water that penetrates the hydraulic system does not settle.
Solution: Electrostatic Oil Cleaning Systems from FRIESS
Friess EFR electrostatic oil cleaning system
EFR model D2 into the cellar of the building and connected the hydraulic filter to the elevator hydraulics
Furthermore, these additives bind to dirt particles so that they can be filtered out more easily.
Due to these additives, the conductivity of the oil often increases significantly. This means that HLPD oils are frequently not compatible with Friess EFR electrostatic oil cleaning systems, as an electrically insulating fluid is required for their use. Due to the age of this oil filling, the D-additives had to a large degree reacted with dirt particles in the system, rendering them inactive. This meant that a Friess EFR system could be used.
So Mr. Friess dragged a Friess EFR model D2 into the cellar of the building and connected the hydraulic filter to the elevator hydraulics. The system has a volume of about 450 liters.
Conclusion
After approx. 750 hours of cleaning, a new analysis was carried out. This showed a drastically improved condition of the oil:
- no more varnish was detected
- only minimal particle contamination was present.
With the now clean “new” old oil, the elevator can hopefully be operated for another 23 years with the same oil filling. The best solution, both ecologically and economically! Furthermore, this solution was significantly quicker than the regular lead time for a maintenance appointment for such an elevator system, as offered by the service company.