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|  MIL-w-43001F
holders and similar parts may be galvanized ferrous metal. The front and rear
vertical plates for end loading machines shall be boiler plate not less than 3/8
inch for size 100; not less than 1/2 inch thick for sizes 200, 300, and 400; and
not less than 5/8 inch thick for sizes 600 and 800. The shell heads (verticaI
end plates) for side loading machines shall be not less than 1/2 inch thick for
sizes 100 and 300; not less than 3/4 inch thick for sizes 200 and 400; and not
less than 7/8 inch thick for sizes 600 and 800. Removable front heads for end
loading machines, that are flat (not contoured) and support only the door, shall
be fabricated from heavy boiler plate, clad or lined with corrosion-resistant
metal not less than 0.058 inch thick. Sizes 25 and 50 machines shall have front
and rear vertical plates fabricated from boiler plate not less than 1/4 inch
thick, clad or lined with corrosion-resisting metal; or in lieu of boiler plate
for the front head they may be fabricated from flat sheet corrosion-resistant
metal not less than 0.158 inch thick, or corrosion-res istant metal not less than
0.045 inch thick, formed and contoured, having strength and rigidity for the
intended service. The shell wrap-around sheets for all machines shall be
corrosion-resistant sheet metal or 3/8 inch thick plate clad with a minmum of
0.010 pure nickel.
3.5.2.2 Shell supports. The shell of all machines shall be supported by
permanent legs, frames, or end plate reinforcements. An intermediate support
for the shell of side loading machines may be used where necessary. Supports
shall be tied together to make a rigid base. Reinforcing ribs shall be welded
to the shell to effect rigid support. The heads of shells having cylinders 58
inches or more in length shall be rigidly tied together by a ferrous metal
structure. The motor(s) shall be supported by the shell heads or the structural
frames tied to the machine base. The motors of all machines may be supported on
a bracket secured to the shell heads or frames, provided that no part of the
bracket is supported by the wrap around sheet. Where the wrap around sheet is
fabricated of plate not less than 3/8 inch thick (see 3.5.2.1), it will be
considered part of the structural frame and in such case, the motors may be
supported by a bracket welded to the plate.
3.5.2.3 Shell doors.
3.5.2.3.1 End loading machines. The shell of end loading machines shall be
provided with a door, mounted on heavy hinges, rigid, and complete with latching
means to insure the door being water-tight when closed or when a broad solid
rubber gasket is used on the door, the rubber gasket shall contact the metal
strip (see 3.5.2.1) and prevent leakage by making a water-tight connection,
completely around the door. The latching requirement shall be verified when the
equipment is tested as specified in 4.6.2. For ail single compartment machines,
the door metal in contact with the washing solution shall be of corrosion-
resistant metal. On sizes 25- and 50-pound, the door shall be provided with a
window of heat treated glass capable of resisting high mechanical and thermal
shock. For end loading divided cylinder machines, the shell door shall be made
of , or a combination of, carbon steel plate, cast iron, or corrosion-resistant
metal. Castings shall be small grained and capable of resisting high mechanical
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