Pneumatic filters - FAQs
4th Quarter 2010
Pneumatic systems & components
1. What are the consequences of non-filtered compressed air?
Unfiltered compressed air destroys pneumatic pipes and tools, unnecessarily causing expensive maintenance costs and production downtime. It can also result in quality losses in the production process.
2. What is the difference between a pre-filter and a coalescence filter?
In a pre-filter, particles are separated on the surface and the filter is arranged transversely to the direction of air flow. In a coalescence filter, the air flows from inside to outside and particles with a micron rating of less than about 0,5 can be filtered out.
3. When should I change my filter?
The element should be changed at a degree of saturation which corresponds to a differential pressure of 0,5 bar maximum. The cost incurred at this stage is relatively small when compared with the cost of the extra energy consumed by the compressor to compensate for this pressure loss. A differential pressure gauge indicates the filter saturation and shows when a filter element must be changed.
4. What is the effect of a pressure differential increase of 0,5 bar across a filter?
3% more energy use.
5. With regards to the differential pressure gauge, why would I need to distinguish between the so-called 'dry' initial differential pressure and the 'wetted' differential pressure?
The dry initial differential pressure is a theoretical value and is valid for a period of only 6 to 8 hours after commissioning of the filter. During this period, a wet band forms at the lower end of the filter element. Due to the oil separation process, the foam envelope is wetted with oil droplets. For this reason, the decisive factor for the indication of the pressure differential of a new filter element is the 'wetted' pressure differential.
6. Can a coalescence filter be used without a pre-filter?
No, if you do not use a pre-filter your filter life will be reduced.
7. What is the typical filter element lifetime of a coalescing filter?
2000 hours.
For more information contact Taryn Ternent, Donaldson Filtration Systems, +27 (0)11 997 6000, [email protected], www.donaldson.co.za
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