F-F-351F
TABLE VIII. Filtering ability test conditions and procedure for
type I filters and type II filter elements - Continued.
3/ Normal pentane insolubles shall be determined by ASTM method D893, except that a
10 000 relative centrifugal force (rcf) centrifuge shall be used.
4/ Minimum cumulative filtering efficiency (expressed in percent):
Total weight of contaminant - Weight of contaminant
solids added
solids in total test oil * x 100
*Weight of total test oil x %
Total weight of contaminant solids added
normal pentane insolubles.
4.6.5.2 Filtering ability for type IV, class 4, filter element. To determine conformance to
3.5.5, a type IV class 4 filter element, assembled in a filter housing for which the element is
intended, shall be set up and tested for filtering ability in accordance with table IX. A mean
efficiency of 10 microns (beta ratio β(10) = 2)) and an absolute efficiency of 25 microns (beta
ratio β(25) = 75) shall be specified as the target filtration performance of the filter elements. A
copy of the qualified element's test data shall be submitted by the offeror/contractor to the
procuring agency for review.
TABLE IX. Filtering ability test conditions and procedure for type IV filter elements.
Oil
Test oil*
Contaminant
Oil in
Flow rate
Rate of addition
Total hours
Temperature at
system
galllons/min
of solids (grams
of filter
filter inlet °F
Class
gallons
liters/min
Designation
per hour)
operation 1/
180 ± 5
1
1
2/7.6
SOFTC-2A
0.4
66
180 ± 5
2**
2
6/22.7
SOFTC-2A
0.8
66
3
180 + 5
5
12/45.4
SOFTC-2A
2.6
66
4
In
accordance
with
ISO 4572
1/ To be accumulated in successive units of 22 hour periods of continuous filter operation and
contaminant addition, separated by 2 hour shutdown periods during which the oil bypasses the
filter completely and no contaminant is added. Immediately after each 22 hour period, oil shall
be withdrawn from the system to reestablish the initial oil level in the reservoir. The portion of
oil so withdrawn shall constitute the sample for analysis. Normal pentane insolubles shall be
determined by ASTM method D893, except that a 10 000 rcf centrifuge shall be used.
* Additive oil shall be used.
** Type IV, class 2 filtering ability test conditions shall also apply to type III filters.
4.6.6 Shock resistance.
4.6.6.1 Type I, class 3 filters, and type II, class 3 filter elements. Filter body shall be
modified for use in the shock test so that the flow area of any oil passage in the filter body shall be
not less than the cross sectional area of the inlet or outlet connection pipe size, whichever is the
smaller. This may be accomplished by drilling out the restricting orifice in the inlet or outlet
connection, or the center tube, or both.
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