MIL-DTL-23554E(SH)
3.4.5 Mounting. The washer-extractor shall be mounted to a deck foundation. The remote control box shall be
capable of being both shelf mounted and bulkhead mounted (see 3.4.14.1). Type I and Type II washer-extractors
shall be provided with a minimum of four bolt holes located on the machine base for securing the unit to a deck
foundation. Bolt holes shall be accessible from the front and rear of the machine. The Type I washer-extractor and
remote control box bolt holes and bolts shall keep the washer-extractor secured to the deck and the remote control
box secured to the shelf or bulkhead when subjected to the shock requirements specified in 3.5.5. Type II washer-
extractor bolt holes shall be sized for a 5/8-inch bolt.
3.4.6 Shell. Except for required shell openings, the shell shall be watertight. When closed or in place, the
door, drain valve, water inlet valves, cylinder shaft, water level sensor, and overflow connection shall be installed to
provide a watertight connection to the shell. The shell shall be rigid to prevent distortion, rattling, or objectionable
vibration under normal shipboard operation. Reinforcement shall be provided where necessary to properly support
attachments. Shell seams shall not pass through the drain valve opening.
3.4.6.1 Shell openings. The shell shall have openings for a door, drain valve, water inlet valves, cylinder shaft,
water level sensor, and overflow connection. No other openings shall be provided.
3.4.7 Cylinder. The cylinder shall be rigid to prevent distortion and failure from stresses caused during the
extraction cycle at the maximum dry weight load capacity. Perforations in the cylinder shall be sized and spaced for
efficient washing, rinsing, and extraction. Perforations shall be free from burrs or imperfections that can damage
clothing. The washer-extractor shall be constructed so the cylinder can be replaced.
3.4.8 Cabinet. The top of the washer-extractor cabinet shall be round. Front and rear panels shall be
completely removable by means of mechanical fasteners in order to access the front and back of the unit for
installation, maintenance, and repair. Metal-to-metal contact between framing, sheet metal, and other items that
may cause rattling or a noise short shall be isolated by the use of sound dampening material.
3.4.9 Door. The shell shall be fitted with a round door mounted on heavy duty hinges, complete with neoprene
gasket and heavy duty latch to ensure watertightness when the door is closed. When the door is fitted with a
window, the window shall be made of tempered glass of a quality and thickness to prevent damage under normal
operation. The glass shall be sealed and capable of ready replacement.
3.4.10 Drain valve. The drain valve shall have a resilient seat and shall be fitted at the lowest point of the shell.
The valve shall be normally open. The drain valve shall be 2 inches IPS (Iron Pipe Size) and shall be located on the
lower back of the machine not more than 6 inches off of the center of the machine. The center height of the drain
outlet location shall be a minimum of 5 inches above the bottom of machine.
3.4.11 Piping. Hot and cold water supply piping, valves, and fittings shall have a working pressure of 100
pounds per square inch.
3.4.11.1 Inlet valves. Hot and cold water valves shall be ¾ inch male NPT (National (American) Standard Pipe
Taper) thread in accordance with ANSI/ASME B1.20.1 and shall be located on the lower left side of the machine
when facing the back of the washer-extractor. If plastic water inlet valves are used, a metal NH (National
(American) Standard Hose Coupling) hose coupling with threads in accordance with ANSI/ASME B1.20.7 shall be
provided to connect the NPT pipe connector to ship service piping. Inlet connection to the shell shall not be less
than 3 inches above the maximum high-water level.
3.4.12 Overflow and vent connections. The washer-extractor shall be fitted with an overflow connection. The
overflow connection shall be sized to prevent water from rising 3 inches above the high-water level when both the
hot and cold water valves are fully opened and the inlet pressure is 40 pounds per square inch. The shell vent and/or
overflow connection shall be configured to prevent any liquid or moisture from discharging from the machine under
normal operations. Venting/overflow connection(s) located above the drive belt shall be supported and reinforced to
prevent the vent/overflow hose(s) from sagging onto the drive belt in the event moisture accumulates in the
vent/overflow hose(s).
3.4.13 Drive. The cylinder shall be V-belt driven by a two-speed electric motor as specified in 3.4.18.1 to
provide proper speeds for washing and extracting cycles. The cylinder shall reverse rotation a minimum of three
times per minute during the wash cycle.
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