MIL-PRF-38170H
3.5.16.2 Drain valves. Manually-operated valves shall be provided for draining liquid from the
fill-drain line disconnect coupling when removing the fill hose, and from the servicing line and
its hose. The drain valves shall be readily accessible outside the control housing assembly and
shall discharge beneath the control housing assembly (see 4.5.1).
3.5.17 Instrumentation.
3.5.17.1 Liquid level gage. A gage, flush mounted on the control panel and having a diameter
of 2.5 inches minimum, shall be provided to indicate the quantity of liquid oxygen contained in
the tank inner shell with an accuracy of ± 3% of tank design capacity. The gage shall be
graduated in gallons of liquid oxygen. If a differential pressure gage is used, the design shall
ensure that breakage of the glass face will not subject the sensing element to damaging pressures
when the inner shell is pressurized to 65 psig. If this type of gage is used, the assembly shall
incorporate pulsation snubbers in the sensing lines to prevent undue fluctuation of the indicating
needle (see 4.5.1).
3.5.17.2 Vapor phase pressure gage. A gage, flush mounted on the control panel and having a
diameter of 2.5 inches minimum, shall be provided to indicate the inner shell pressure. The gage
shall be graduated over at least 270° of the dial face, and shall be accurate to within ± 2% of full
scale range. The indicating range shall be approximately 1.5 times the normal working pressure
of the tank inner shell. The gage shall not go off-scale before the inner tank relief pressure is
reached. A tap that senses gage line pressure shall be provided near the gage in the form of an
SAE AS4395E04 flared-type fitting for external test use. The fitting shall be sealed with an
AN929-4 type cap (see 4.5.1).
3.5.18 Cleaning solvent drains. The tank assembly design shall allow complete removal of
cleaning solvents and flushing liquids after cleaning operations. The use of removable threaded
plugs or similar devices is acceptable in locations where drain valves would be impractical (see
4.5.1).
3.5.19 Dimensions. The overall outside dimensions of the tank assembly shall not exceed the
following dimensions (with all access openings closed): a length of 90 inches; a width of 55
inches; and a height of 40 inches (see 4.5.1).
3.5.20 Weight. The weight of the empty tank and its accessories, including the trailer chassis,
shall not exceed 720 pounds (see 4.5.1).
3.5.21 Tubing and lines. Tubing and lines shall be located in protected positions, securely
fastened to frame or body structures, and provided with protection where they pass through
members, except where a connector is provided at the frame (see 4.5.1).
3.5.22 Locking devices. Where practicable, all screws, pins, bolts, and other similar hardware,
shall be equipped with locking devices. Safety wire, self-locking nuts, cotter pins, or lock-
washers will be acceptable. Where practicable, lock-washers shall be secured to bolts or screws.
Cotter pins shall be fabricated from corrosion-resistant steel or other corrosion-resistant material
(see 4.5.1).
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