MIL-DTL-85061C
ported to accept a pressure transducer with a response in the order of 30 milliseconds
(see figure 5).
b. Each tube assembly shall be filled with MIL-PRF-7024 test fluid and mounted so that
movement of the tube assemblies is not restricted.
4 5.9.2 Pressurization source. The pressurization source shall be designed to impose a
pressure of 0 to 180 PSIG and back to 0 PSIG in a time period of 60 milliseconds with a rate of
cycling of one cycle every two seconds. Means shall be provided to vary this pressure to each
assembly in alternate operations.
a. The pressurizing system shall provide a pressure regulator to ensure a constant
pressure being applied to the assembly at each cycle.
4.5 9.3 Instrumentation. Each coupling test assembly shall have its pressure transducer
connected to a pressure recorder equipped with a galvanometer and electronic counter to record
the cycling pressure of each assembly (see figure 5).
4.5.9.4 Test procedure. Coupling test assemblies shall be pressurized by starting the
pump in the system. The accumulator gate valve, the pump pressure regulator and the nitrogen
charge accumulator shall be adjusted to control the pressure and pressure rise time during the
test.
a. The timer or the electrically operated multi port valve shall be adjusted to produce a
pressure surge of 0 to 180 PSIG to 0 PSIG in two second intervals with the pressure surge peaks
to be measured in seconds or fraction of a second (see figure 6).
b. The coupling test assemblies shall be subjected to 50,000 pressure surge cycles.
There shall be no evidence of leakage or malfunction from any coupling during the pressure
surge cycling.
4.5.10 Burst pressure test.
4.5.10.1 Burst pressure tests at temperature extremes. The coupling test assembly shall
be subjected to a pressure of 375 ± 5 PSIG, with the test fluid at a temperature of -65 °F for 5
minutes. The pressure test shall then be repeated using test fluid at a temperature of 200 °F and a
pressure of 375 ± 5 PSIG for 5 minutes. The test fluid shall be in accordance with
MIL-PRF-7024 for both tests.
4.5.10.2 Burst pressure test at room temperature. The coupling test assembly shall be
subjected to a pressure of 375 ± 5 PSIG for 5 minutes with the test fluid at a temperature of
75 °F. The test fluid shall be in accordance with MIL-PRF-7024.
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