MIL-DTL-432H
TABLE V. Torque loading
Size (inches)
Torque
Type
Size
Torque
(foot- pounds)
(inches)
(foot-
pounds)
I
2
15
.75
7
II
2
35
.75
20
III
2
10
--
--
VI
2
15
.75
7
4.4.7 Leakage tests (except type VII). The leakage tests in the following
paragraphs are to determine gasket failure by pressure loss. A pressure drop
to 20 pounds per square inch (psi) (.138 MPa) or less reading on the gage
under conditions as specified in the following test procedures shall be
considered a failure to comply with the leakage requirement.
4.4.7.1 Inverted jig procedure (gasket in contact with fuel). The gasket
subjected to the test specified in 4.4.7 shall be transferred to a pressure
jig as shown on Drawing 8-1-161. One hundred milliliters of the special
testing fuel specified in 4.5.2 shall be put in the container of the jig, and
the plug with the gasket in place shall be inserted and tightened to the
torque specified in table V. The jig shall be inverted so that the testing
fuel is in contact with the plug. Air, or nitrogen under pressure, shall then
be introduced through the air inlet until the pressure gage reads 25 psi
(.172 MPa), the pressure being maintained by closing the needle valve on the
air inlet. If a pressure drop to 20 psi (.138 MPa) or less on the gage
indicator is observed within 10 minutes, the test shall be considered a
failure. If the gasket passes the test, proceed with the test in 4.4.7.2.
4.4.7.2 Upright jig procedure (gasket not in contact with fuel). The test
shall be repeated with the same gasket in place (i.e., loosen, tighten to
required torque, and introduce air again as in 4.5.7.1 with the exception
that the jig shall not be inverted). If a pressure drop to 20 psi (.138 MPa)
or less on the gage indicator is observed within 10 minutes, the test shall
be considered a failure.
4.4.7.2.1 Room temperature. If no leakage occurs in 4.4.7.2, the
pressure
jig with gasket in place shall be placed in an upright position in
a constant
air temperature of 77º± 2ºF (25º±.6ºC) and accurate pressure shall
be noted.
The jig assembly shall remain at this temperature for 24 hours. If
during the
24 hour period a pressure drop to 20 psi (.138 MPa) or less on the
gage
indicator is observed, the test shall be considered a failure.
4.4.7.2.2 Water immersion. Continuing with the same assembly as specified
in 4.4.7.2.1, it shall be placed under water at a controlled temperature of
140° ± 2°F (60º±.9ºC) and left for 24 hours. The assembly shall then be
removed and allowed to remain at 77º± 2ºF (25º±.6ºC) for 3 hours. If a
pressure drop to 20 psi (.138 MPa) or less on the gage indicator is observed,
the test shall be considered a failure.
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