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MIL-PRF-38170H

torque of 300 ft-lb per inch of nominal line size applied to the fitting in either direction. The

mounting shall have clearance to allow use of a 24-inch wrench. The disconnect coupling shall

consist of a coupling cap, seat, and gasket, conforming to Ordnance Corps drawings C8987869,

C8987855, and B8987832, respectively, assembled as shown on drawing C8987830. The

coupling shall be located to provide clearance for attachment of liquid transfer hoses without

interference between the fill-drain line hose or coupling and the servicing hose. An automatic

pressure relief valve shall also be provided in the fill-drain line between the shutoff valve and the

disconnect coupling for venting excess pressure from the fill-drain line (see 4.5.1, 4.5.21).

3.5.7.2 Liquid servicing line. The tank assembly shall have a liquid servicing line for servicing

liquid oxygen from the inner shell. The installation shall ensure against liquid entering the line

from the inner shell when all liquid line valves are closed and the tank is tilted 10 degrees along

either the longitudinal or lateral axis. The servicing line shall have a manual shutoff valve as

near as possible to the point where it enters the outer shell. The line shall terminate outside the

control housing in a � inch external pipe thread fitting oriented to discharge vertically upward,

for attachment of the liquid servicing hose. The fitting mounting shall withstand a torque of 300

ft-lb per inch of nominal line size applied to the fitting in either direction. The mounting shall

have clearance to allow use of a 24-inch wrench. The fitting shall be located to provide

clearance for attachment and use of the servicing hose without interference with other

components. An automatic pressure relief valve shall also be provided in the servicing line

between the shutoff valve and the hose for venting excess pressure from the servicing line and

servicing hose (see 4.5.1, 4.5.21).

3.5.8 Liquid servicing hose. One 10-foot length of cryogenic liquid hose conforming to MIL-

PRF-83772 shall be provided with the tank. One end of the hose shall be connected to the �

inch external pipe thread of the liquid servicing line disconnect fitting. The other end of the hose

shall be provided with a female liquid oxygen filler valve conforming to MIL-PRF-38201.

Provisions shall be made in the tank assembly for storing the hose in a coil and protecting it from

damage during tank acceleration and other use conditions specified herein (see 4.5.1).

3.5.8.1 Liquid servicing hose bleed fitting. A bleed fitting shall be provided to permit purging

of the female filler valve and transfer hose prior to servicing. The fitting shall open the check

valve of the filler valve and shall discharge the gaseous and liquid oxygen below the control

housing so that it will not impinge on the tank, its components, or operating personnel (see

4.5.1).

3.5.9 Vapor vent line. The tank assembly shall have a vapor vent line that will permit filling of

the tank as specified (see 3.6.4). The line shall have an inside diameter of not less than 1 inch.

The line shall extend along the top inside of the inner shell and shall have spray holes so that

cleaning fluid pumped through the vent line will be sprayed against the inside top of the inner

shell to flush sediment and other contaminants from the tank. The total area of the spray holes

shall be at least as that of the cross sectional area of the vent line. The vent line shall have a

manual shutoff valve as near as possible to point where it enters the outer shell, but shall be