MIL-PRF-27720G
inches, shall also be provided for the equipment operation handbook and the maintenance and
inspection record (see 4.5.1).
3.5.24 Thread sealer. Tape conforming to CID A-A-58092 or other pipe-thread sealing
materials specifically approved by the procuring activity shall be applied to threads prior to
assembly of all pipe-threaded fittings subject to contact by liquid/gaseous oxygen or nitrogen.
The tape shall be applied starting with the third thread to prevent contaminating the system (see
4.5.1).
3.5.25 Lubricants. The tank shall meet all the requirements specified herein when components
requiring lubrication are serviced with military or federal specification lubricants as described in
MIL-HDBK-838 (see 4.5.1).
3.5.26 Static discharge reel. A static discharge reel shall be provided on each tank assembly. The
reel shall have capability for latching of the cable at any extended length and shall have
automatic retraction. The cable shall have a length of 100 feet minimum and terminate with a
MIL-DTL-83413 grounding connector.
3.6 Performance.
3.6.1 Storage capacity. The tank shall store or transport, under the conditions specified herein,
not less than 400 U.S. gallons of 99.5% pure liquid oxygen or liquid nitrogen at its atmospheric
pressure boiling temperature. The tank assembly shall have an internal volume of not less than
440 U.S. gallons in order to provide an expansion (vapor) space of not less than 10% of the total
design capacity (see 4.5.5).
3.6.2 Heat leak evaporation rate. The tank heat leak evaporation loss shall not exceed the
equivalent of 19 pounds of oxygen per 24-hour period when the tank is filled to not less than
50% of capacity with liquid oxygen or nitrogen and subjected to the tests specified (see 4.5.8.1).
3.6.3 Pressure buildup system. The tank assembly pressure buildup system shall pressurize the
inner shell vapor space to 50 psig within 10 minutes after closure of the vapor vent line shutoff
valve and initiating buildup when the tank is filled to between 15 and 20 percent of rated
capacity and has been vented to atmospheric pressure for not less than 4 hours (see 4.5.9).
3.6.4 Liquid fill line flow rate. The fill line shall be capable of filling the tank with liquid
oxygen or liquid nitrogen through the liquid line at a rate of 50 gpm minimum with a maximum
pressure drop through the fill line, filter, and the liquid line of 16 psig. With a flow rate of 25
gpm minimum, the pressure drop shall not exceed 6 psig (see 4.5.11.1).
3.6.5 Liquid servicing line flow rate. The liquid servicing line shall be capable of transferring
liquid oxygen or liquid nitrogen from the inner shell through the liquid line, servicing line, and
filter at a rate of 25 gpm minimum with a maximum pressure of 6 psig (see 4.5.11.2).
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