MIL-F-80056C
3.3.2 Fastening devices. All fasteners shall be installed to prevent change of
tightness. Fastening devices subject to removal or adjustment shall not be
permanently installed.
3.3.3 Surfaces. All surfaces shall be clean and free of harmful or extraneous
materials. All edges shall be either rounded or beveled unless sharpness is
required to perform a necessary function. Except as otherwise specified herein,
the condition and finish of all surfaces shall be in accordance with the
manufacturer's commercial practice.
Melding, brazing, or soldering shall be
3.3.4 Welding. brazing. or soldering.
employed only where specified in the original design. Any excess material used for
such operations shall be thoroughly removed from the part(s) upon completion of the
operations.
the paint color and
3.3.5 Painting. Unless otherwise specified (see 6.2),
application shall be in accordance with the manufacturer's commercial practice.
threaded parts used on the furnace and its related
3.3.6 Threads. All
attachments and accessories shall conform to FED-STD-H28 and the applicable
"Detailed Standard' section referenced therein.
3.3.7 Electromagnetic interference control. When specified (see 6.2), equip-
ment furnished under this specification shall comply with MIL-STD-461. The equip-
ment and subsystem(s) class and the emission and susceptibility requirements shall
be as specified.
3.4 Components. The furnace shall consist of not less than a shell, drain,
all accessory electrical motors,
contractors,
pot ,
transformer(s),
cover,
controls, relays, signal lights and switches prewired where possible for operation
upon connection to source of power.
The outer shell of each Type I and Type III furnace shall be
3.4.1 Shell.
fabricated of sheet steel, reinforced and welded on all sides and the bottom. Each
Type II furnace may have a ceramic outer shell. The shell thickness shall be not
less than 10 gage, U.S. Standard Sheet Metal Gage, for the Type I furnace and not
less than 0.188 inch for Type 11 and Type III furnace. The submerged electrode
design furnace may have a ceramic outer shell. The top of the bath (excluding
shall be between 32 and 38 inches above floor level, except for furnaces
cover ),
requiring greater height for reasons of capacity. Unless otherwise specified (see
6.2), the Type II and Type 111 furnaces shall be mounted on steel I-beam skids or
similar material to elevate the bottom of the furnace not less than 3 inches above
the floor. The top of the cabinet shall be constructed of material to prevent
distortion. Cabinet construction shall prevent contact between insulation and bath
material.
3.4.2 Drain. The Type I furnace shall be provided with drainage facilities for
the bath material in case of pot wall failure. The Insulation surrounding the
drain area shall be sloped to the drain.
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