MIL-PRF-25369D
4.7.2 Threading inspection. Threads shall be inspected for compliance with the requirements
provided in the acquisition documents. Any method of measuring the characteristics of thread
forms are acceptable as long as it can be demonstrated and ensures conformance (see 6.6).
4.7.3 Leakage. After the gas charge has been determined, filled cylinders shall be immersed in a
water solution (1% aerosol OT clear, 25 percent pure or equivelant) to a depth so that the
uppermost portion of the cylinder is at least 1 inch below the water level for a minimum of 2
minutes. A 20-inch (mercury) vacuum shall be maintained above the surface of the solution.
4.7.4 Examination of product. Cylinders shall be visually inspected to determine conformation
with the requirements of this specification with respect to general construction, finish, markings,
materials, and workmanship.
4.7.5 Deformation. There shall be no deformation of the cylinder or of the cylinder puncturable
area after heating to a temperature of 160±2 ºF, for not less than 20 minutes.
4.7.6 Dimensional check. Sample cylinders shall be measured to determine compliance with the
dimensional requirements of figures 1 and 2. Dimensional checks shall be made following the
leakage tests.
4.7.7 Cyclic leakage. Filled cylinders shall be subjected to two complete temperature cycles.
Each cycle shall consist of maintaining the cylinders at minus 65±2 ºF for 2 hours, and then at
160±2 ºF for 2 hours. After completion of the temperature cycles, cylinders shall be tested for
leakage when specified (see 4.7.3 and 6.2).
4.7.8 Hydrostatic pressure (burst) test. Each sample cylinder shall be labeled to distinguish it
from other samples. After the labeling is complete, sample cylinders shall be subjected to an
internal hydrostatic force of not less than 8,000 psi at 70±2 ºF for a period of not less than 5
seconds.
4.7.9 Rupture test. WARNING: This test is dangerous (see 6.3). The sample cylinders shall be
tested for fragmentation by gradually heating the cylinder as suggested in 6.3. This test will verify
that the ruptured cylinder does not splinter, fragment, or fail at the cap. Fragmentation is defined
as the complete separation of the puncturable area or of any portion of the cylinder.
4.7.10 Maximum filling density test. Sample charged cylinders shall be weighed, then the carbon
dioxide discharged and cylinders weighed again. The difference between the first weighing and
the second is the quantity of carbon dioxide inside. The cylinder shall then be filled with water
and weighed. The ratio of the weight of water to the weight of carbon dioxide is the density,
calculated as follows:
Weight of CO2
Filling density =
X
100
Weight of H2O
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