5
2.0 Operation
Do not operate filter at pressures in excess of
Maximum Working Pressure indicated on Serial Number Tag.
NOTE: Maximum Operating Temperature - 150
°
F, 66
°
C.
Liquid filtration above 120
°
F, 49
°
C is not recommended since
there is typically oil present in a vapor state which passes
through the filter and condenses downstream.
NOTE: Grade G - If operated above 100
°
F, 38
°
C, a Grade 1
filter may experience less than 1000 hours of life because
of greater oil vapor content.
A. Operational Checkpoints
Grades A, B, C, D, E, F
1. Grades B, C, D, E, F - Check pressure drop across
the filter
a. Pressure differential in excess of 6 psi (0.42 kgf/cm
2
) -
pressure indicator in red area - indicates that the filter
sleeve or element should be replaced.
NOTE: Element should be changed annually or when
indicator changes to red, whichever occurs first.
NOTE: Pressure drop should never exceed 15 psi
(1.0 kgf/cm
2
).
NOTE: Grades B, C, E, F - Pressure drop may temporarily
increase when flow is resumed after flow stoppage. Pres-
sure drop should return to normal within one hour.
b. Check for sudden reduction in pressure drop. This
might indicate:
(1) Possible leak across element o-ring seal
(2) Leak through the element due to physical
damage
2. Check flow, pressure, and temperature to make
certain filter is being operated within design condi-
tions.
3. Grades A, B, C, E, F - Check to see that filter is
installed level to insure proper drainage.
4. Grades A, B, C, E, F - Check that manual drains are
drained periodically or that automatic drains are
functioning.
Grade G
1. Check for an oily smell by opening the manual valve. If
an oily smell exists, the following should be checked:
a. Filter element adsorption capacity exhausted
b. Leak across element o-ring seal
c. Leak through element due to physical damage
d. Presence of liquids because of lack of or failure of
prefilters
e. Flow, pressure and temperatures outside design
conditions
f. Presence of gaseous impurities which cannot be
adsorbed by activated carbon
Methane, carbon monoxide, carbon dioxide
and various inorganic gases cannot be removed by a Grade 1
filter.
C. Flow Capacity
Maximum air flow for the various filters at 100 psig
(7 kgf/cm
2
) is indicated in Table 1. To determine maximum air
flows at inlet pressures other than 100 psig
(7 kgf/cm
2
), multiply flow from Table 1 by air flow correction
factor from Table 2 that corresponds to the minimum
operating pressure at the inlet of the filter.
NOTE: Filters should not be selected by pipe size. Select
using flow rate and operating pressure only.
Table 1 - Maximum Flow @100 psig [7 kgf/cm
2
]
Housing
scfm
[m
3
/hr]
32
625
[1110]
34
1000
[1700]
36
1250
[2125]
38
1875
[3158]
40
2500
[4250]
42
3125
[5310]
44
5000
[8490]
46
6875
[11,670]
48
8750
[14,850]
50
11875
[20,175]
52
16250
[27,610]
54
21250
[36,100]
Minimum
Inlet
Pressure
Table 2 - Air Flow Correction Factor
psig
20
30
40
60
80 100 125 175 150 200 250 300
kgf/cm
2
1.4 2.1 2.8 4.2 5.6 7.0 8.8 12.3 10.6 14.1 17.6 21.1
Correction Factor
0.30 0.39 0.48 0.65 0.82 1.00 1.22 1.65 1.43 1.87 2.31 2.74
Minimum
Inlet
Pressure
psig
350
400
450
500
550
600
650
700
kgf/cm
2
24.6
28.1
31.6
35.2
38.7
42.2
45.7
49.2
Correction Factor
3.18
3.62
4.05
4.49
4.92
5.36
5.80
6.23
n
