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|  MIL-C-21049F
4.7.6 Pressure drop, type I. With the coupling halves connected, the
coupling inlet shall be connected to a pressure source of 20 psig gaseous oxygen.
With an inlet pressure of 20 psig, the pressure drop through the coupling assembly
shall be determined for flow rates of 10, 60 and 120 liters per minute. The
coupling assembly shall pass the requirements specified in 3.6.5.
4,7.7 Proof pressure, type I. With the coupling halves connected and the
outlet port sealed, a pressure of 200 psig gaseous oxygen shall be applied to the
inlet port of the coupling assembly. The coupling assembly shall pass the
requirements specified in 3.6.6.
4.7.8 Operational test.
4.7.8.1 Type I. A liquid oxygen source of 60 to 90 psig shall be supplied to
the inlet of the coupled assembly. The outlet shall have 6 to 12 inches of tubing
connected to a manual valve. After starting a flow of liquid oxygen, submerge the
cold coupling assembly in a bath of O-T-620 (trichloroethane) and flow for two
minutes. After assuring that trapped air is released from the coupling, measure
coupling leakage by the bubble collection method. Remove the assembly from the
bath and immediately measure the torque required to disconnect and connect the
coupling halves. Repeat the above procedure two additional times. The coupling
assembly shall pass the requirements specified in 3.6.7.1. At the completion of
this test, the coupling assembly shall be subjected to and pass the leakage, test
specified in 4.7.5.
4.7.8.2 Type II. The type II coupling assembly shall be connected to a
liquid oxygen source and a flow of liquid oxygen produced through the coupling.
The flow shall be stopped and the coupling halves immediately disconnected. The
process of connecting the halves, producing a flow of liquid through the coupling,
stopping the flow, and disconnecting the halves shall be repeated five times and
the torque measured for each connection and disconnection. The coupling assembly
shall pass the requirements specified in 3.6.7.2.
4.7.9 Burst pressure (static), type I. With the outlet port of the coupling
sealed, a gaseous oxygen pressure of 350 psig shall be applied to the inlet port
of the- couplinq and maintained for 15 seconds. The coupling shall pass the
requirements specified in 3.6.8.
4.7.10 Hiqh temperature.
4.7.10.1 Type I. The coupling assembly shall be placed in a chamber having
an internal temperature of 260 + 5F (127 + 3C) for a minimum period of 1 hour.
After this exposure, the coupling shall be-removed from the chamber and
immediately subjected to and pass the torque, type I (4.7.3.1) and leakage, type I
(4.7.5) tests. The coupling assembly shall pass the requirements specified in
3.6.9.1.
4.7.10.2 Type II. The high temperature test shall be the same as for type I
except that the coupling assembly shall be subjected only to the torque,
type II test (4.7.3.2) after temperature conditioning. The coupling assembly
shall pass the requirements specified in 3.6.9.2.
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