MIL-DTL-23581B(SH)
3.3.4 Resistance wire. Resistance wire for heating elements shall conform to the following requirements:
a.
Chemical composition (nominal approximate):
Nickel
-
76.0 to 79.0 percent
Chromium
-
19.0 to 21.0 percent
Iron
-
1.0 (max.) percent
Manganese
-
2.5 (max.) percent
Carbon
-
0.25 (max.) percent
Silicon
-
0.75 to 1.50 (max) percent
Sulfur
-
0.03 (max) percent
b.
Mechanical properties:
Tensile strength pounds per square inch 100,000 minimum
Elongation in 10 inches 15 percent minimum
3.3.5 Insulation. Insulation shall be of the rigid type or of fibrous glass batt type supported by cover panels.
3.3.6 Restricted materials. The drying tumbler shall be free from asbestos, wood, and cadmium materials.
3.4 Design.
3.4.1 General design. The drying tumbler shall be non-reversing, open end, once through, end loading type
arranged so as not to recirculate the heated air. The tumbler shall be electrically heated and provided with a
thermostat that can be varied by the operator. The drying tumbler shall meet the following disassembly and
reassembly requirements:
a. The drying tumbler shall be constructed so that it can be readily disassembled into sections or parts that can
be passed through a 30-inch diameter by 60-inch long cylinder and reassembled with a minimum of effort in the
submarine laundry space.
b. Cutting of parts by torch or similar means to accomplish disassembly at the site, and reassembly of parts by
welding or similar method, shall not be permitted.
3.4.2 Capacity. The machine shall accommodate or hold a load of not less than 16 pounds dry weight
minimum capacity preload cotton clothing (see 6.2).
3.5 Construction.
3.5.1 Metal joints. Rivets, bolts, screws, nuts, and washers shall be of steel, except when brass or corrosion-
resistant steel is fastened, in which case they shall be of brass or corrosion-resistant steel. Where dissimilar metals
are fastened, rivets, bolts, screws, nuts, and washers shall be galvanically compatible with materials being joined.
Electrodes or welding rods used for welding parts shall deposit material similar to the part base metal. Nuts subject
to shock or vibration shall be self-locking.
3.6 Details of units or parts.
3.6.1 Frame. When assembled, the frame shall provide a rigid and durable support for the housing, cylinder,
heating coils, fan, motor, and driving mechanism.
3.6.2 Housing. The entire unit shall be enclosed in a housing of sheet steel panels. Except for the air inlet, air
outlet, door opening and access plates, the housing enclosing the cylinder shall be sealed to prevent air leakage.
When closed or in place, door and access plates shall be sealed to prevent air leakage or disruption of air flow when
the drying tumbler is in operation. Doors or access plates shall be provided for maintaining machinery and cleaning
the machine. The upper and lower front panels of the drying tumbler shall be constructed and secured so that they
are readily removable without the use of special tools or the need to disconnect wiring from component parts other
than parts with plug type connectors, to facilitate lint removal between the cylinder and the housing and from the
heating elements.
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