There are many reasons customers are switching from standard filter housing to either our Auto-duplexes or Automatic Backwashing Systems.
- Reduces process/system downtime
- Reduces operator exposure
- Reduces maintenance cost
- Reduces labor costs
- Reduces filter element disposal and replacement cost
- Increases productivity
Self-cleaning filters represent the ideal situation and provide the most productive and labor free solution. Rosedale Products' ABW is unique because our patented technology backwashes with the lowest volume of liquid. This is achieved by using normal shop air (propane or nitrogen can also be used) to create the shear velocity needed to effectively clean the filter with only the clean liquid inside each housing.
Flexible and Versatile
Flow rates from less than a hundred to several thousand GPM can be easily accommodated. Also, to meet footprint or space requirements, we can configure the systems on one side of the headers for long narrow aisles or up against walls or place the housings on both sides of the headers for shorter, but broader areas. Combustible/Explosive areas can take advantage of our state-of-the-art Air Logic control systems which are totally pneumatic and inherently safe. Micron ratings from 5 micron and larger are available in a variety of filter media including standard bags and wedgewire. Continuous flow is maintained by taking only one station at a time off-line for cleaning - the rest of the housings continue filtering.
Our systems have included air compressors, pumps, power distribution boxes, motor starters, climate controlled enclosures, heat trace and air dryers, all skid mounted and ready for installation.
How It Works
Fluid is introduced through the bottom of the filter housing. It is then forced through a filter element where the contaminant is captured on the outside surfaces of the filter. The clean fluid exits through the outlet. A controller monitors the differential pressure across the filter. When enough contaminant collects on the element and the differential pressure reaches a pre-selected point (^P), the backwash sequence is initiated. The backwash is accomplished by automatically shocking the filter with air or gas which lasts approximately 10 seconds. There is no introduction of additional fluids to contaminate the process, and the volume of liquid discharged is held to a minimum, reducing disposal costs. When the backwash operation is completed, the system returns on-line, the controller resets itself, and the whole process begins again.
Single vs Dual Stations
On smaller systems with flow rates less than 400 GPM our standard is "single station" systems which means each housing is a station. Larger systems use a "dual station" approach which has two housings per station. The two housings share common manifold pipes which allow a fifty percent reduction in valves and, during backwash, two housings at a time (1 Dual Station) go off-line for cleaning. The "Dual Station" approach. Note that there are three stations, with each station having two housings on common manifold which is most visible below the housing. In the picture above, this Pneutroller system also has six housings in a "single station" configuration with each housing having separate valves.