MIL-DTL-19328F
4.6 Performance.
4.6.1 Final assembly pressure. The converter, including all its fittings and connections, shall be subjected to
the pneumatic pressure that is specified as the final assembly pressure (see 3.7.1). While this pressure is
maintained, the converter shall be tested by applying leak detection compound that conforms to MIL-L-25567,
type I, to all fittings and connections of the converter and then examining all fittings and connections of the
converter for leakage. The pressure shall then be increased to a level sufficient to open the pressure relief valve
and to demonstrate that the required flow capacity can be achieved without excessive pressure. If there is any
leakage from the converter, except for the leakage's that are allowed for installed components by their respective
specifications, the converter shall be rejected (see 3.7.1). Nitrogen, per BB-N-411, type I, grade B, class 1 may be
used in lieu of oxygen for the inspection.
4.6.2 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 (see
3.7.2).
4.6.3 Evaporation loss.
4.6.3.1 Evaporation loss tests. The evaporation loss tests in the vented condition may be conducted on the
container only. The weight losses shall be recorded on the vacuum performance test plate as specified (see 3.5.1).
4.6.3.2 Initial evaporation loss in vented condition. The container shall be filled with liquid oxygen to rated
capacity and allowed to stand in vented condition for a minimum period of two hours for equilibrium to be
established. After which, with the unit vented to the atmosphere, the rate of loss in weight for a 24-hour period
shall be recorded. The container shall pass the requirements specified (see 3.7.3.1).
4.6.3.3 Second evaporation loss in vented condition. After a lapse of at least 30 days from the above test, the
vented evaporation loss test shall be conducted in the same manner and the evaporation loss for a 24-hour period
recorded. The container shall meet the requirements specified (see 3.7.3.1).
4.6.3.4 Evaporation loss in pressurized condition. Upon completion of the vented evaporation loss tests, the
complete converter assembly including all components shall be subjected to a 48-hour evaporation loss test in the
pressurized condition. The converter shall be placed in the pressurized condition and the initial weight reading
shall be taken immediately after the converter has been filled. The loss in weight for a 48-hour period shall be
recorded. The converter assembly shall pass the requirements specified (see 3.7.3.3).
4.6.4 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. The converter shall be filled with liquid oxygen to design capacity and
immediately after filling, the converter shall be placed in the pressurized (buildup) condition. The time required to
attain buildup pressure shall be within the time specified (see 3.7.3.4).
4.6.5 Dielectric strength. The sensing element shall be installed in an empty converter and the dielectric
strength of the sensing element shall be measured at a voltage of 500 volts, rms, at a commercial frequency. The
voltage shall be maintained for a period of 10 seconds between the converter ground and each lead wires, and
between the two lead wires. The sensing element of the converter shall pass the requirements specified (see
3.7.3.5).
4.6.6 Insulation resistance. The sensing element shall be installed in an empty converter and the insulation
resistance of the sensing element shall be measured at 50 volts, direct current, between each electrode and the
converter ground, and between the electrodes. The sensing element of the converter shall pass the requirements
specified (see 3.7.3.6).
11
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business