Solberg International, Ltd., 1151 Ardmore Itasca, IL 60143 USA
Ph: +1 630.773.1363 • Fax: +1 630.773.2643 • Email: sales@solbergmfg.com • Web: www.solbergmfg.com
Oil Mist Exhaust Filters • Rev. MA4031103
Page
SOLBERG
2. Filtration Rules of Thumb
General: For peak output performance from a compressor, blower, vacuum pump,
engine, or any other machine that consumes air, one must have clean, unrestricted air
on the inlet and discharge. Proper filtration can help stabilize the working environment
within rotating equipment even when the external conditions may be quite severe. A
critical component in creating the right working conditions is filter sizing. With the
properly sized filter, equipment will run smoothly over its entire expected operating life.
A major factor in filtration and filter sizing is air velocity through the filter media.
Generally, the slower the velocity of air through a media the higher the filter efficiency
and, conversely, the lower the pressure drop. Therefore, the primary goal in filter sizing
is to optimize the velocity of air through the media (sometimes called face velocity).
Recent developments in product design allow for the possible selection of oil mist
exhaust filters based on the type of equipment being used. It is, for the first time, possible
to identify the appropriate grade of aerosol discharge filter because of the extensive
research completed by the Solberg R&D Department. Please follow the below rules to
correctly size your oil mist exhaust filter. If further consultation is required, please contact
Solberg Mfg., Inc.
Rule of Thumb #1: Forget all that you know about air/oil separators for Compressed Air
Systems, as such systems repeatedly fail in vacuum pump applications. The first
consideration is to determine the type of vacuum pump or machine being used. The
particle size distribution and mass of oil aerosol discharging from a vacuum pump is as
varied as the number of separator tank designs utilized by industry. The primary pump
technologies in need of air/oil separation are rotary vane, rotary screw, rotary piston,
liquid ring, and reciprocating. Each type of pump produces its own specific oil discharge
characteristics and requires the appropriate media make-up to effectively capture and
drain oil aerosols.
Rule of Thumb #2: Determine the type of oil being used in the vacuum pump. Trade
names, viscosity/grade of oil, and the lubricant base (mineral, synthetic, etc.) are all
useful in determining the discharge aerosol characteristics.
Rule of Thumb #3: Determine how much oil the pump consumes under normal
operating conditions. Typical consumption rates are gallons or liters per hour. The
amount of oil consumed is typically the amount of oil being discharged.
Rule of Thumb #4: Determine pump operating cycles including vacuum range,
temperature fluctuations, contaminant gases or vapors, and hours of operation per
day/week. Also, determine the maximum pressure drop or filter restriction the system will
allow.
(5 pages)
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