MIL-PRF-81380E
3.5.4 Differential pressure. With a new element(s) installed in a filter/monitor housing
(single element or full scale), the differential pressure across the element shall be not greater than
8 psi (55.15 kPa) at rated flow (see 3.3) when tested in accordance with 4.5.2.2.
3.5.5 Reaction to solids. The filter/monitor element shall allow a maximum average of 0.26
mg/liter of total solids in the effluent fuel. The average total solids shall consist of the combined
tare weights of the individual sample filters [membrane filters used to measure the solids in the
effluent stream (see 4.4.1.4)] divided by the total volume of fuel passed through the samplers.
No individual sample shall exceed 0.5 mg/liter. Solids content shall be tested in accordance with
ASTM-D2276. The time to reach a differential pressure of 75 psi (517.05 kPa) shall be not less
than 10 minutes at 100 percent of rated flow when tested in accordance with 4.5.2.3.
3.5.6 Mechanical integrity. The filter/monitor element shall withstand a pressure differential
of 180 psi (1241.1 kPa) without collapse when tested in accordance with 4.5.2.3.
3.5.7 Reaction to water. The filter/monitor element's reaction to water shall be as shown in
table I when tested in accordance with 4.5.2.4. The minimum running time to 25 psi (172.4 kPa)
differential pressure shall be as specified in table I for conditions one and two. When analyzed in
accordance with ASTM-D3240, the effluent shall not contain more than 5 ppm of free water.
Table I. Filter/monitor element's reaction to water.
Free Water Content
Sampling
Running
Flow
(by volume)
Total Leakage
Intervals
Rate
Time
Test
(minutes)
(minutes)
(% of Flow Rate)
Condition
(%)
Influent
Effluent
1
100
15 (minimum)
50 ppm
5 ppm (max)
-
5
2
10
100 (minimum)
50 ppm
5 ppm (max)
-
60
1000 ppm
3
100
-
(slug)
-
5.0%
1
50% Water
50% FSII
(slug)
-
5.0%
1
4
100
-
3.5.8 Reaction to surge. The filter/monitor element shall not pass water in excess of 5 ppm
or be otherwise adversely affected by a surge of fuel when tested in accordance with 4.5.2.4.
3.5.9 Reaction to slugs. When triggered by a water slug (see condition 3 and 4, table I), the
total fluid leakage through the device shall be not greater than 5.0 percent of the rated flow to the
device, when tested in accordance with 4.5.2.4.2.
3.5.10 Reaction to freezing/thawing. After the element has been frozen and then thawed in
accordance with 4.5.2.6, the filter/monitor shall not pass water in excess of 5 ppm.
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