MIL-PRF-83041C
4.5.4.5 Salt-fog. Using spray apparatus, piping and collector reservoir materials that are non-reactive to
salt spray, subject the filter separator to a continuously atomized, finely divided, wet, dense salt spray
mixture (5% sodium chloride and 95% water) at a constant 95°F with minimum air circulation. Do not
use immersion heaters in the exposure area. Uniformly distribute the salt fog over the filter generator at
a fallout rate between 0.01 and 0.1 ounces/ 12in2 /hour minimum 48 hours. After the test, store the unit
at ambient atmosphere minimum 48 hours for drying. Perform the full performance test as specified in
4.5.3 with no degradation in appearance or performance.
4.5.4.6 Sand and dust. The filter separator shall be subject to a test chamber temperature minimum
73°F with a relative humidity (maintained throughout the test) maximum 30%. Subject the filter
separator to a blowing dust concentration (97 to 99 % by weight) of silicon dioxide with particle size
ranging from 100 to 325 microns at air velocities ranging from 300 to 1750 feet/minute for minimum 6
hours. Stop the test and allow the test article to return to ambient conditions. Remove accumulated dust
from the test article by brushing, wiping, or shaking. Do not remove dust by either air blast or
vacuuming. Take care not to introduce additional dust into the test article. Perform the full
performance test as specified in 4.5.3 with no degradation in appearance or performance. Repeat the
test using sand concentrations of 2.2 to ±0.5 g/m. Perform the full performance test as specified in 4.5.3
with no degradation in appearance or performance.
4.5.4.7. Rain. The filter separator shall be subject to an instantaneous rainfall rate equivalent to 0.80
mm/minute, a minimum rate of 10 cm/hr. The rainfall intensities shall be accompanied by winds of 18
m/s (40 miles per hour). The rain shall be produced by a water distribution device of such design that
the water is emitted in the form of droplets having a diameter range between 0.5 and 4.5 millimeters.
The rain shall be dispersed completely over the test item for 15 minutes. The wind at the velocity
specified in the test plan shall be maintained for minimum 30 minutes. Rotate the test item to expose
the rain source to the other side of the test item that could be exposed to blown rain in the deployment
cycle. Examine the test item and conduct a visual inspection. The unit shall allow any amount of free
water to penetrate the test item. Measure and document the volume of water (if any) inside the
protected areas of the filter separator.
4.5.5 Deviations from API Bulletin 1581. The following are filter separator requirements, which are
deviations to API Bulletin 1581 for test requirements of Group II, Class B, Test Series 1, 2, and 3:
4.5.5.1 Fuel contamination limit. The allowable effluent fuel contamination limit for free water shall
not exceed 10 parts per million and any single sample shall not exceed 15 parts per million as outlined
in API Bulletin 1581.
4.5.5.2 Additive I. Additive I shall be Stadis 450 or similar in lieu of ASA 3.
4.5.5.3 Additive II. Additive II shall be HITEC-580 or similar conforming to MIL-PRF-25017 in lieu of
HITEC E-515.
4.5.6 Single element test. Test series 3 shall be run in an appropriate scale element test vessel per API
Bulletin 1581 and as modified by 4.5.5.
4.5.7 Coalescer structural test. A minimum of two coalescer elements, after being subjected to a full-
scale performance test as described in 4.5.3, shall be subjected to a differential pressure test. Each
element shall be capable of withstanding a differential pressure minimum 75 psi without bypassing of
seals.
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