MIL-PRF-38170H
3.5.23 Thread sealer. Tape conforming to 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).
3.5.24 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).
3.6 Performance.
3.6.1 Storage capacity. The tank shall store not less than 50 U.S. gallons of 99.5% pure liquid
oxygen at its atmospheric pressure boiling temperature. The liquid storage tank assembly shall
have an internal volume of not less than 55 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 14 pounds of oxygen per 24-hour day when the tank is filled to not less than 50%
of design capacity with liquid oxygen and subjected to the tests specified (see 4.5.8.1, 4.5.8.2).
3.6.3 Pressure buildup system. The tank assembly pressure buildup system shall pressurize the
inner shell vapor space to 50 psig when the tank contains 2.5 gallons or more of liquid oxygen.
The buildup system shall pressurize the tank 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 % of rated capacity, and has been vented to atmospheric pressure for not less
than 4 hours (see 4.5.9.1, 4.5.9.2).
3.6.4 Liquid fill-drain line flow rate. The fill-drain line shall be capable of liquid oxygen flow
or transfer into or out of the inner shell at a rate of 10 gallons per minute (gpm) minimum
without the pressure drop through the line and filter exceeding 3 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 from the inner shell through the servicing line and filter at a rate of 2 gpm
minimum without the pressure drop through the line and filter exceeding 2 psig (see 4.5.11.2).
3.6.6 Vapor vent line. The vapor vent line shall permit the tank assembly to cool down within
15 minutes and allow filling flow rates up to and including 10 gpm without the inner shell vapor
pressure exceeding 15 psig when the tank assembly is subjected to the conditions and tests
specified (see 4.5.11.4). The vent line shall allow venting of liquid when the inner shell is being
filled and the tank contains between 50 and 52 gallons of liquid (see 4.5.11.4, 4.5.11.5).
3.6.7 Vacuum retention. The tank assembly, after evacuation of the annular space, shall not
show any increase in absolute pressure attributable to leakage or outgassing within 7 days (168
hours) when subjected to the tests specified (see 4.5.7.1).
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