5
3.0 Maintenance
A. When to Replace Filter Element
NOTE: Grades 7,5,3,1 - complete element is replaced;
Grade 9 - unless separator core is damaged outer sleeve
only is replaced.
1. Grades 9,7,5,3
a. Initial (dry) pressure drop: 1 psi (0.07 kgf/cm
2
) to 2
psi (0.14 kgf/cm
2
)
b. Operating pressure drop: As filter becomes liquid
loaded (wetted), pressure drop will increase to 2 to
6 psi (0.14 to 0.42 kgf/cm
2
). Further pressure drop
occurs as element loads with solid particles.
FOR MAXIMUM FILTRATION EFFICIENCY, REPLACE ELEMENT
WHEN PRESSURE DROP REACHES 10 PSI (0.7 KGF/CM
2
) OR
ANNUALLY, WHICHEVER OCCURS FIRST.
NOTE: Pressure drop may temporarily increase when flow
is resumed after flow stoppage. Pressure drop should
return to normal within one hour.
NOTE: Grades 5 and 3 - During normal operation bottom
of foam sleeve will have a band of oil. Spotting above the
band indicates that liquids are accumulating faster than
they can be drained and that prefiltration is required.
2. Grade 1
a. Adsorption capacity - 1000 hours at rated capacity.
Element life is exhausted when odor can be de-
tected downstream of the filter.
B. Procedure for Filter Element Replacement
CAUTION: THIS FILTER IS A PRESSURE CONTAINING DEVICE.
DEPRESSURIZE BEFORE SERVICING.
1. Isolate filter assembly from system by opening
by-pass valve (if one is installed) and closing inlet and
outlet valves.
2. Depressurize filter by slowly opening manual drain
valve.
3. Disassemble filter housing
a. For High Pressure Model 24 - unscrew the collar
holding the filter bowl to the head and remove the
filter bowl and collar.
b. For Corrosion Resistant Models 12 thru 36 and High
pressure Model 32 Remove the filter bowl,
unscrewing it from the filter head by hand or strap
wrench.
4. Clean filter bowl
5. Remove and replace complete element (all models) or
sleeve only (Grade 9)
a. Removing and replacing complete element
1) Unscrew the old filter element and discard. Also
discard the small o-ring that seals the filter to
the filter assembly head.
2) Insert small replacement o-ring on top of
replacement filter element and screw
replacement element into filter assembly head.
b. Removing and replacing sleeve only (Grade 9)
1) Remove nut and bottom cap.
2) Slide disposable filter sleeve down over
separator core.
3) If necessary, unscrew separator core from filter
head and clean with soap and water.
4) Reassemble separator core to head. (Use new
o-ring supplied with replacement sleeve).
5) Slide new filter sleeve over separator core.
6) Replace bottom cap and nut.
C. Internal Auto Drain Mechanism -
(Corrosion Resistant Models only)
It is recommended that drain mechanism be replaced
annually.
Grade 9
Grades 7, 5, 3, 1
Nut
Optional
Internal Drain
(Corrosion Resistant only)
Head
Head O-Ring
Cartridge/O-Ring
Collar
(High Pressure Model 24only)
Bowl
Separator Core
Replacement
Sleeve
Replacement
Cartridge
Bottom Cap
