MIL-DTL-19803G
4.6.1.1 Converter. Every converter shall be examined visually (for critical defects) to
determine conformance to this specification. The classification of defects, table II, shall be used
to classify the defects found.
4.6.1.1.1 Dimensions. The converter shall be checked dimensionally to determine
conformance to the dimensions specified herein.
4.6.2 Permanent volumetric expansion. This test shall be conducted before the outer vessel
is added. The inner vessel, complete with all lines and fittings, shall be subjected to a hydrostatic
or pneumatic test in a water jacket in which the vessel is totally submerged and free to expand in
all directions. The difference is temperature between the water in the jacket and the water or gas
in the vessel shall be not greater than 5 °F (2.8 °C). The test pressure shall be not less than 200
psig (1379 kPa) and shall be maintained not less than one minute or longer, to ensure complete
expansion of the vessel. Any internal pressure previously applied shall be not greater than 90
percent of the test pressure. The pressure gage shall permit readings to an accuracy of one
percent. The expansion gage shall permit readings to an accuracy of one percent or 0.1 cubic
centimeter (cc). The expansion shall be recorded in cc. The water in the expansion gage shall
come to rest quickly. If the water in the expansion gage drops below its original position or does
not come to rest quickly after the pressure is released, the test shall be repeated. The inner vessel
shall meet the requirements specified in 3.5.1.
4.6.3 Pressure tests.
4.6.3.1 Inner vessel. The test shall be conducted before the outer vessel is added. The inner
vessel shall be charged to a pressure of 200 + 5 psig (1379 + 35 kPa) and maintained for not less
than one minute. The inner vessel shall meet the requirements specified in 3.5.2.1.
4.6.3.2 Complete assembly. The complete converter assembly, including all fittings and
tube connections, shall be subjected to a pneumatic pressure of 95 psig (655 kPa) applied
through the test port. While the test pressure is maintained, all fittings and connections shall be
examined for leaks by application of leak test compound conforming to MIL-PRF-25567. The
complete converter assembly shall meet the requirements specified in 3.5.2.2. Care shall be
taken to remove all traces of the leak test compound from the converter assembly after the test is
performed.
4.6.4 Filling time. The time required to fill the converter to its specified capacity by
transfer of liquid oxygen using standard transfer equipment shall be determined. The filling
pressure at the converter filler valve shall be maintained at 30 psig (207 kPa). The time required
to fill the converter shall be within the time specified in 3.5.3.
4.6.5 Buildup time. The time required to attain buildup pressure shall be determined with a
converter that has been empty for a minimum of 30 minutes. Fill the converter with liquid
oxygen to design capacity and immediately after filling the converter, actuate the pressure
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