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Parker Hannifin Corporation
Finite Filter Operation
Oxford, MI
Problem
Probable Cause
Solution
Too High Initial
Air flow Excessive for housing size.
Install larger filter.
Pressure Drop
Filter media grade too fine.
Install coarser element.
Too much oil/water from compressor.
Pre-coalesce with grade 10 - oversize
housing.
Premature Clogging
Lubricant improperly selected for compressor,
Change oil, consult with lubricant
(Air Flow Drops Off)
causing varnish or carbonizing of lubricant.
supplier.
Excessive inlet particulate contamination.
Prefilter with Interceptor.
Excessive lubricants present on element caused
Prefilter with Grade 10 and oversize
by either high lubricant viscosity or very high
coalescer to compensate.
inlet aerosol level.
Oil/water emulsion forming on element.
Remove water by drip leg, aftercooler.
Install mechanical separator upstream.
Ice forming or oil viscosity too high due to
Raise temperature.
Excessively low unit temperature.
Oil Present Down-
Bowl not properly drained of waste liquids.
Drain regularly, use auto drain.
stream of Filter
Element not sealing.
Replace element.
Filter piped backwards.
See "INSTALLATION"; Re-pipe.
Filter being by-passed by valving.
Close valve.
Contaminated air entering system from second
Change pipe or relocate filter.
source downstream.
Oil vapors condensing downstream.
Install an adsorber.
Excessive inlet oil level.
Precoalesce with Grade 10 and
possibly oversize.
Element damaged, chemically attacked or not
Change and consult distributor
installed in housing.
or factory for other than neutral pH.
Oil present in pre-contaminated
Clean piping.
downstream piping.
Excessive flow surges.
Relocate filter, pre-coalesce with
grade 10 and oversize coalescers.
Maintenance Bulletin - International H-Series
(1/4" to 1" NPT, BSPF, BSPT Sizes only)
When Coalescer or Interceptor differential pressure reaches clogged condition
(6-10 PSID) replace element immediately. DO NOT ATTEMPT TO CLEAN
FILTER TUBE. System contamination can result. DO NOT ATTEMPT TO
RESEAT A FILTER TUBE. New serrated indentations can be formed causing
leakage. DO NOT BY-PASS THE COALESCER unless the by-pass line is
also filtered.
Finite H-Series filters should be installed in a level pipeline,
mounted vertically, the bowl downward with one bowl length
clearance for element removal. The filter should be installed at the
highest pressure point available, and as near as possible to the equipment
to be protected and have a drip leg immediately upstream. The
coalescers and particulate filters should be visible and
easily accessible for periodic draining and maintenance.
The filters should be piped in accordance with the instruction tags,
flow arrows or "IN" and "OUT." Should these tags become unreadable,
install the coalescer so that flow passes through the filter tube from
inside-to-outside. Plumb particulate and adsorber filters so that flow passes
through the filter from outside-to-inside. The various filter locations relative
to other equipment should be as follows (unless specific instructions are given
to the contrary): (1 ) COALESCERS and WATER SEPARATORS are placed
before the dryer. (2) The INTERCEPTOR (Particulate) goes ahead of the
COALESCER when pre-filtration is required. (3) The INTERCEPTOR is
installed downstream of desiccant dryers to prevent desiccant migration.
(4) The ADSORBER is always preceded by a COALESCER.
INSTALLATION
OPERATION
Air coalescing is a continuous, balanced, steady-state process
occuring at or below rated flow, which depends on two factors for
high performance: (1) The bowl must be kept free of waste liquid
build-up and (2) The element must be replaced when the differential
pressure reaches 6-10 psid, 12 psid Maximum. Differential pressure
can be sensed at the inlet and outlet ports by two gauges, or by Finite's
DPI-13 differential pressure indicator, DPG-15 differential pressure
gauge, or by observing system characteristics.
Bowl draining is accomplished by opening the manual drain valve
(standard on all housings), at least once every 8 hours depending
on the liquid load. The Finite Auto-Drain AD-12 is a useful tool that
replaces manual draining. Finite's timed drain valve can be
used to drain the bowl automatically.
A Finite coalescer, under normal system conditions, will operate for
6 to 12 months before reaching its Maximum differential pressure.
A "PU" series Interceptor, or a "QU" series coalescing element
with a pleated prefilter can be employed ahead of the coalescer
to increase its life. The interceptor should be replaced when its
differential pressure reaches 8 - 10 psid.
Finite coalescers are designed for nominal operation with 10-20 wt.
oil. Any viscosity increase over that of 20 wt. oil must be offset by
a proportionate oversizing of the filter element. Consult your Finite
representative.
MB-141
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