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|  MIL-T-46765(AT)
channel formed rub rail of minimum width to cover rear dual tire treads shall be provided. Front
head sheet shall be formed or reinforced for rigidity. Front head and tailgate shall be the same
height as the sides. The interior of body shell and side reinforcements shall be welded with
continuous welds. The rub rail shall be attached using continuous welds, or with intermittent
welds for not less than 50 percent of the edge length of contact edges. The body interior shell
shall be watertight and of smooth skin construction.
3.5.2.1 Tailgate. The tailgate panel shall be not less than 10 gage (3.416 mm) (0.1345 inch)
steel. When tailgate is closed, the tailgate shall be watertight. The tailgate shall have heavy duty
hardware and a heavy duty tailgate latch operable by a control at the front curbside corner of the
tank body. The tailgate shall be reinforced to prevent deformation under load.
3.5.2.2 Body understructure. Body longitudinal sills, each having a minimum section
modulus equivalent to that provided by a 125 mm (5 inches) by 14.9 kg/m (10 pounds per foot)
I-beam, shall be provided to support hoist load. Not less than eight crossmembers, each having a
minimum section modulus equivalent to that provided by a 100 mm (4 inches) by 8 kg/m
(5.4 pounds per foot) channel shall be provided to support an evenly distributed load.
Crossmembers shall be welded to the body shell with not less than 100 mm (4-inch) lengths of
weld, front and rear of both ends of each crossmember, and with staggered intermittent welds on
not less than 300 mm (12-inch) centers. Contact edges of crossmembers with longitudinal sills,
and contact edges of welded reinforcements shall be welded for not less than 50 percent of the
edge length.
3.5.2.3 Baffles. Three baffles shall be furnished. The baffles shall be minimum 10 gage
(3.416 mm) (0.1345 inch) steel. The baffles shall be installed vertically and shall be hinged at
the top so that the baffles swing back when the tank body is elevated for discharging the tank
contents. Stops shall be provided to prevent the baffles from swinging forward. The baffles
shall be the height and width of the interior of the body tank, and have a minimum clearance on
the bottom. The front baffle shall have staggered, 19 mm (.750-inch) diameter holes with a
center to center distance of approximately one inch. The open area shall be 51 percent of the
baffle area. Hydraulically operated baffle agitator shall be furnished to clear the sewage waste
from the front baffle and permit the flow of clear water into the front compartment. The two rear
baffles shall be solid. Each of the two rear baffles shall have a notch on the top edge of
sufficient size to allow flow of waste material from one compartment to another. One baffle
shall have the notch on the street side and the other baffle shall have the notch on the curb side.
The purpose of the notches is for overflow of water from one compartment to the next
compartment. The forward baffle shall strain out the sewage to a liquid state. The rear baffle
shall be approximately 1220 mm (48 inches) from the tailgate. The two forward baffles shall be
located so that the three forward compartments are of equal capacity.
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