01/26/2012

FILTER LOCATION:

WEIGHING THE OPTIONS 

The optimal location for hydraulic filtration in machinery can be confusing.  Filter efficiency, ease of service, component life and cost are all areas affected by where the filter is positioned in your system.  Let’s look at the advantages and possible disadvantages of each option:

·       Return line filtration is a popular location for most hydraulic systems, and high efficiency can be achieved at a reasonable cost.  It is beneficial because pressure is high enough to force fluid through very fine media (i.e., 10 microns) with relatively low flow velocity.  The only watch-out is that back pressure from the element could affect performance of some components.

·       Pressure line filtration offers very good protection for downstream components.  Filtration rates of 2 microns or less can be achieved as pressure forces fluid through the media.  A possible drawback is that efficiency could suffer if high flow velocities and pressure and flow transients disturb trapped particles.

·       Suction side filtration is also a good location for filters because efficiency is improved by the absence of high fluid velocity and high pressure drop at the pump intake site.  The only negative of this location is that the element may create restriction that could adversely affect pump life.

·       Off-line filtration is a good choice because it provides continuous, multi-pass filtration with controlled flow velocity and pressure drop.  High efficiency rates (i.e., 2 microns and less) can be achieved.  Polymeric filters and heat exchangers can be included for further fluid conditioning.  A slight disadvantage of off-line filtration is that initial investment cost may be higher.

        Whatever the filtration location, your goal is to maximize the ability of the filter to do its job—removing contamination and extending equipment life!

QUALITY FILTRATION CAN HELP MEET YOUR

GOALS FOR CONTAMINATION CONTROL

AND INCREASED MACHINE LIFE.