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Fill line (permanently installed converters) |
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|  MIL-D-19326H
ground, where possible, in order to be readily accessible from the ground.
Clearance shall be left around the fill-mating section of the combination fill-
buildup-vent valve to allow the insertion of the 2 inch (50.8 mm) diameter female
section of the ground servicing valve and to permit the ground crew to manually
exert an engagement or disengagement torque.
3.6.4.1 Fill line (permanently installed converters). The distance from the
fill section of the combination fill -buildup-vent valve to the liquid oxygen
converter shall be kept as short as possible. The fill line shall be not longer
than 10 feet (3.048 m). The fill lines shall be insulated to prevent frosting and
sweating if they pass over equipment which will be harmed by water dripping from
the lines, or drip pans shall be installed under the lines.
3.6.4.2 Vent line. The vent line from the combination fill-buildup-vent valve
shall be so located as to drain overboard at the bottom of the aircraft within
sight of the filler box and not closer than 24 inches (0.61 m) from it measured
along the fuselage. Flow from the overboard vent shall be directed away from the
filling valve so as to not create a hazard for servicing personnel and not allow
liquid oxygen to impinge on the aircraft. The vent lines shall be insulated to
prevent frosting and sweating if they pass over equipment which will be harmed by
water dripping from the lines, or drip pans shall be installed under the lines.
There shall be no hydrocarbon fills or drains forward or above in proximity to
vent outlet.
3.6.4.3 Drain valve (permanently installed converters). For permanently
installed converters, a liquid oxygen drain valve, in accordance with MIL-V-25962,
shall be connected in the fill line between the combination valve and the
converter in order to drain the converter. Plumbing from the outlet of the liquid
oxygen drain valve shall terminate in an end fitting conforming to MS33656 and
located in the filler box. It shall have a cap in accordance with AN929-5 with a
suitable chain permanently attached to the top of the cap.
* 3.6.5 Pressure relief valve. The pressure relief valve or on the liquid oxygen
converter shall be vented overboard, using 5/16 inch (7.94 mm) minimum outside
diameter tubing. The relief valve overboard vent may be the same as that used for
the combination fill-buildup-vent valve. When removal converters are installed, a
pressure relief valve in accordance with MIL-V-9050, Type V, shall be connected
into the supply line downstream from the MS22068 coupling assembly that also vents
overboard (see Figure 2).
* 3.6.6 Check valves. Except where otherwise specified, check valves shall be
installed in accordance with Figures 7 and 8 and be incorporated into the quick
disconnect equipment as shown in Figure 2. In all multiple converter
installations, check valves shall be installed where they are effective in
preventing additional loss of oxygen in the event any one converter or line is
destroyed. When more than one converter is installed in a multi-place aircraft in
accordance with Figures 7 and 8, check valves, in accordance with MIL-V-25513 or
MIL-V-7908, depending upon the operating pressure, may be installed in each of the
auxiliary distribution lines to each station. Check valves that are designed in
accordance with MIL-V-7908 may be installed along the primary distribution lines
to each station. All check valves installed shall be cryogenic check valves.
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