Portable offline or kidney filter systems are selected based on several factors including ease of handling and maintenance, type of oil to be filtered, size, cost and filter element among others.Ease of handling
The portable trolleys carrying the filter systems have to be small enough to cope with limited walkways, light enough to be handled by one person, and even be able to climb stairs. Ease and speed of clean-up
An offline filter system has to cope with cleaning up dirty oil systems with the expectation that filter element replacement costs in cleaning up the oil are not going to go through the roof. Moreover, offline filtration is mostly done during plant shutdown, which means one cannot spend too much time on cleaning up the filtration systems. Even when filtration is done while the plant is in operation, one does not want to spend a lot of time in clean-up since labour costs money.
The viscosity of the oil at the temperature it is being filtered plays a major role in determining filter size – the thicker the oil, the larger the element has to be. One may need to consider larger filter units to cope with the thicker oils used in the plant. Additionally, choice in element micron size will ensure specific oil cleanliness targets are met.
Type of oil
The filter system should be selected based on the type of oils one has to filtrate. Cross contamination of different types of oils is a major concern, especially when using offline filter systems.
Transferring used oil into containers
The filter system should allow the transfer of used oil into containers without the need of going through the filter element. This eliminates the need to use drain plugs when changing oil.
Ease of element change out
The filter system should support easy element change out without unnecessary spillage of oil.
The oil filtration system should be built robustly for the rough handling expected in mine site conditions.
Hydac’s offline portable filtration systems
Hydac Australia has launched a new offline portable filtration system designed to address these requirements. Designed specifically for Australian conditions, Hydac’s filter systems are manufactured locally in Australia.
Key features of Hydac’s offline portable filtration systems include: Innovative tilt axle arrangement in the filter trolley reduces effort to tilt back and move around by 60%, allowing handling by one person; compact envelope dimensions allow access to most walkways; large pneumatic types make the unit suitable for stairs; Hydac Fleximicron elements available in micron sizes from 1 micron to 90 micron to suit a wide range of applications; elements attractively priced for dirty oil systems and less dirty systems; cast iron gear pump handles dirt on some of the dirtier systems; variable speed drive allows various flow rates to be set for the pump, enabling oils of different viscosities to be filtered at different temperatures; and dual function hand control valve on trolley allows oil transfer while bypassing the filter assembly or having a continuous offline filtration of oil.
Hydac’s offline portable filtration system also features a filter element designed for easy change out without unnecessary spillage; heavy duty and robust build to suit rough site conditions; cost-efficient Hydac Fleximicron element with 99.99% filtration efficiency, excellent fluid compatibility and very low starting pressure drop for guaranteed longer element service life and energy savings; and trolley working in a cascade filtration using two filter housings to save time on the offline filtration.
HYDAC’s newly designed offline portable filtration system exceeds user expectations in terms of flexibility, efficiency and savings.