MIL-DTL-23581B(SH)
3.6.3 Door. A loading door concentric with the cylinder opening shall be provided at the front of the housing.
The door shall be insulated and configured to act as a baffle for retaining the load within the cylinder. The door
shall be hinged and fitted with a latching handle and an electrical interlock to prevent operation of the cylinder when
the door is not latched.
3.6.4 Cylinder. The cylinder shall be circular in shape and formed from perforated galvanized steel sheet.
Perforations shall be staggered and not larger than 11/32-inch diameter. Perforations in the cylinder shall be free from
burrs or imperfections that will damage clothing. The back of the cylinder shall be solid and the front end of the
cylinder shall have a circular opening to match the recessed section of door in housing. The cylinder shall have an
approximate diameter of 24½ inches and a length of 28 inches. Cylinder shall be driven through a steel gudgeon
welded to a steel transmitter, which in turn is securely bolted to the rear cylinder head. The cylinder shall be fitted
with lifting ribs of adequate number and size to properly tumble the clothing. Through tie-rods shall be installed
within the lifting ribs to increase the rigidity of the cylinder.
3.6.5 Transmitter. The transmitter shall be made of steel, shall have spiders of sufficient number and length to
support the cylinder under full load conditions, and shall be securely bolted to back sheet of cylinder and welded to
the gudgeon.
3.6.6 Gudgeon. The gudgeon shall be made of steel of suitable strength and hardness to ensure safe and
durable operation under full load conditions. The gudgeon shall be machined for proper fit with bearing sleeves at
back of machine.
3.6.7 Cylinder bearings. The cylinder shall be supported at the rear by two widely spaced, heavy duty, ball or
roller bearings. The bearings shall be of a readily renewable type and of sufficient capacity and durability to provide
vibrationless rotation of the cylinder under full load conditions for not less than 5000 hours.
3.6.8 Fan. A fan of sufficient capacity to meet the drying requirements of 3.7.1 shall be provided.
3.6.9 Air ducts. Air ducts shall be sized to meet the requirements of 3.7.1.
3.6.10 Exhaust. An exhaust duct opening of ample size shall be provided for exhausting air after passage
through the tumbler. The opening shall be provided with suitable fittings for connecting an exhaust air duct. The
exhaust air flow capacity shall be 355 cubic feet per minute exhausted through a 6-inch diameter vent duct
connection. The exhaust duct shall be located on the back left side of the machine, below center, when facing the
back of the drying tumbler.
3.6.11 Drive adjustments. A means shall be provided for adjusting belts or chain drives.
3.6.12 Insulation. Except for external surfaces touched by the operator to operate the drying tumbler (e.g., door
handle, control panel), external surfaces shall be insulated from the internal heat source so that not more than 15
percent of the outer housing surface exceeds a temperature of 35 °F above the ambient air temperature during the
test (see 4.3.3.10). External surfaces touched by the operator to operate the drying tumbler shall not exceed 35 °F
above the ambient air temperature during the test (see 4.3.3.10). Insulation shall be encased to hold the insulation in
place and to prevent settling, crumbling, or flaking within the housing.
3.6.13 Size. Excluding appendages such as the door handle, knobs, etc., the overall maximum dimensions shall
not exceed 26 inches wide by 40 inches deep by 40 inches high.
3.6.14 Electrical requirements. Unless otherwise specified in the contract or order, all electrical equipment
shall conform to the requirements in IEEE 45 for electrical shipboard installation. Electrical equipment shall be
designed for operation on a Type I electrical system as required in MIL-STD-1399-300. The control panel shall be
dripproof. Pushbuttons and switches shall be arranged for safe and convenient operation. Wiring shall be arranged,
protected, or insulated so that temperatures within the tumbler will not result in deterioration of the insulation and
cause short circuits to occur. The machine shall operate on 440-volt, 3-phase, 60 Hertz electrical service. Electrical
load shall be not greater than 19.5 kilowatts.
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