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|  MIL-T-62032H
3.5.11.3 Emergency venting capacity. The vapor flow capacity of the emergency
venting system, whether through pressure-actuated or fusible venting, shall be not less than that
required by 49 CFR, section 178.341-4, for compartment pressures of not more than 5 psig
differential.
3.5.11.4 Automatic vent(s). Vent(s) shall be equipped for hydraulic or pneumatic
automatic operationl except class 16 vehicle may be mechanically operated. The automatic
vent(s) shall be spring-loaded shut to prevent the spillage of fuel and vapors. The vent(s) shall
be mounted in the top of the tank near the longitudinal center. The actuation system shall be
capable of exerting a force of at least 150 pounds in order to break the vent(s) loose under icing
conditions. The vent(s) shall be interlocked with the automatic flow control valve (see 3.5.13.2)
to assure that the vent is open during loading and off-loading operations.
3.5.11.5 Vent construction. The vent(s) shall be of aluminum with a corrosion-resistant
steel weld ring with the aluminum isolated from contact with steel, or shall be of
corrosion-resistant steel.
3.5.12 Vapor recovery system. The vehicle shall be equipped for vapor recovery in
general conformance to the recommended practice of the American Petroleum Institute (API) in
RP 1004, and the California Air Resources Board in executive order G70-10-A. The automatic
vent(s) (see 3.5.11.4) shall be furnished with a vapor recovery hood or collecting chamber and
shall be manifolded to an overturn rail or other suitable manifold piping. Connections between
the tank vapor space vents and the header tube(s) shall be not less than 3 inches in diameter
(7 square inches in open cross-sectional area). The header tube shall be not less than 4 inches in
diameter (12 square inches in open cross-sectional area). The manifold piping, overturn rail,
connections and header tube shall be of stainless steel or aluminum.
3.5.12.1 Vapor recovery flange. A standard pipe flange, suitable for future installation
of a vapor recovery adapter, shall be furnished. The flange shall be suitable for installation, at
the user's option, of either a 4-inch cam and groove quick-coupling conforming to API RP 1004
or a 3-inch cam and groove quick-coupling conforming to MIL-C-27487. The flange shall be of
stainless steel or aluminum.
3.5.12.2 Vapor recovery flange location. The vapor recovery flange shall be located on
the side of the vehicle opposite the driving controls, between 2.5 and 5 feet above ground level.
3.5.12.3 Vapor recovery system protection. Any portion of the vapor recovery system
installed on the top of the tank which could damage the tank in the event of overturn shall be
protected by a rollover device. Any portion of the vapor recovery system installed at the rear of
the tank shall not extend beyond the rear bumper. The rollover device shall be of stainless steel.
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