MIL-PRF-27720G
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 using 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).
3.5.16.3 Vacuum sensing tap. A vacuum sensing tap into the annular space, terminating in a
1/8-inch female pipe thread fitting, shall be provided for attachment and detachment of vacuum
sensing equipment without degrading the vacuum in the annular space (see 4.5.1).
3.5.17 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).
3.5.18 Dimensions. The overall outside dimensions of the tank assembly, with all access
openings closed, shall not exceed 88 inches in length; 54 inches in width, and 60 inches in height
(see 4.5.1).
3.5.19 Weight. The weight of the empty tank and its accessories, including the pallet base, shall
not exceed 1,550 pounds (see 4.5.1).
3.5.20 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, 4.5.2).
3.5.20.1 Gage tubing and lines. Tubing and lines connected to removable gages shall be of the
stainless steel braided type.
3.5.21 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 material (see 4.5.1).
3.5.22 Hoisting and tiedown attachments. Tiedown devices that shall serve for both tiedown
and hoisting purposes shall be provided (see MIL-HDBK-1791 for guidance). These tiedown
devices shall include four or more tiedown ring assemblies conforming to USAF 48B7796. The
tiedown devices shall permit hoisting, with a 3g acceleration force, of the complete tank
assembly filled to design capacity with liquid oxygen. The rings shall be located on the tank
assembly so that transportation personnel can easily rig safe slings from common cable and
spreader bar components for hoisting by a single-hook overhead crane .(see 4.5.1, 4.5.6.4)
3.5.23 Compartments. A compartment for storage of all tools required in normal operation and
maintenance of the tank assembly shall be provided, with provisions for locking it with a
common padlock. Another compartment, weatherproof and a minimum size of 9 by 11.5 by 2
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