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|  MIL-P-5238C
d. After the fuel has been saturated, it is necessary to keep the proper
humidity in the atmosphere above the fuel in order to prevent loss of water
from the fuel to the atmosphere. Little water will be lost from the fuel
if the difference between the vapor pressure of the water dissolved in the
fuel and the vapor pressure of the water vapor In the atmosphere (Pvf-Pva)
is 0.2 inch of mercury or less. The vapor pressure of the water in the fuel
may be calculated by dividing the actual water content of the fuel by the
saturated vapor pressure of the water at the fuel temperature. These tests
should be conducted with saturated fuel, therefore, the vapor pressure of the
water in the fuel should be the same as the saturated vapor pressure of the
water at the temperature of the fuel.
Allow the excess water to settle out, (at least
e. Maintain fuel at
1 hour per foot depth of fuel)
f.
Drain all excess water
g. Analyze samples from three points in the bulk of the fuel by the Carl-
Fisher method. The average of the three samples shall be fully saturated
with water at 80F up to an excess of 15 parts per million. The water satur-
ation point of fuels varies for different fuel blends. No fuel which is
saturated with less than 90 parts per million water should be used for these
tests.
h. After fuel is saturated and the excess water has been drained off, but
before cooling, atomize 1cc per gallon of water over the surface.
1. Immediately begin rapid agitation and cooling simultaneously, thus
keeping the free water suspended in the fuel.
Immediately upon reaching the test temperature, begin the test run.
j.
k. Upon completion of each test, the fuel should contain not less than
.75cc per gallon of water over the quantity required to saturate the fuel.
4. 5.24.2 Room temperature test. The pump shall be operated at rated flow
and pressure in the fuel being conditioned above during step c. Every 15
minutes the pump shall be stopped for 1 minute and then restarted. Input
and output shall be recorded during these runs. There shall be no indication
of incorrect operation, disruptive electric discharges, or other failure. If
to 9OF
the detail specification does not require an icing test, the
(Sea Level) portion of the endurance test (4.5.16) may be conducted with water
as the test fluid, in lieu of the above. The water shall possess the mineral
hardness and the degree of sal inity in accordance with the detail specification.
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