INSTALLATION, START-UP & MAINTENANCE MANUAL
SD-220 TO SD-600
REV 04 – 10 Oct 2003
Page 20 of 32
4.5. FILTERS
4.5.1. General Comments and Use
Sullair MPH high efficiency pre-filters and MPR reverse flow after filters are designed to
remove solids, oil and water condensate out of compressed air and other neutral,
compressed gases. These filters provide high flows and low differential pressures.
4.5.2. Function
The pre-filter is designed to flow from the inside to the outside. The after filter is designed
to flow from the outside to the inside. Solids are filtered out by impact or by the effect of
inertia, whereas oil particles and drops of moisture are filtered out by the effect of
coalescence. By the force of gravity, the contaminants collect in the lower filter vessel and
are drained automatically or manually.
4.5.3. Assembly and Installation
☛ Note
• Filters should always be installed where the air or gas temperature is
the lowest.
• The piping system must be cleaned before filter installation.
• The filters must always be installed vertically.
• An arrow on the upper part of the housing marks the direction of the flow.
• Sufficient free space should be left below the filter to allow removal of the
filter bowl as required when changing elements.
4.5.4. Maintenance
☛ Note
• As a minimum, filter elements should be replaced when the differential
pressure reaches 10 psid or after 1 year of operation, which ever comes
first.
• The functioning of the automatic condensate drain is to be tested weekly
by manual operation.
• Should there be no automatic condensate drain, depending on the
amount of condensate, the pre-filter must be drained several times a day
by opening a manual hand drain.
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