The wastewater in the galley sewer normally
contains a large amount of grease; therefore, a grease
trap must be installed in the sewer system to intercept
and collect grease. A typical grease trap, which can be
constructed in Bravo company shops, is shown in
figure 2-21. This trap allows grease to enter the sewer
system, to congeal, and to float to the top of the barrels.
At a minimum, the grease must be removed once daily
from the trap and disposed of, usually by burning. A
properly constructed and maintained grease trap helps
to ensure proper operation of the leach field that
disposes of the wastewater.
Laundry units are installed after the advanced base
has been established and essential support equipment is
in place. You will encounter units similar to the one
shown in views A, B and C of figure 2-22. The laundry
unit shown in figure 2-22 is shown in a more permanent
location This oil-fired, skid-mountedlaundryunit (fig.
2-22) is comprised of a washer, a dryer, a moisture
extractor, a centrifugal water pump, and a water heater
with a pressurized water storage tank.
A description of the major components of the skid-
mounted laundry unit is listed below.
The Milnor washer is a fully automatic or manually
operated unit with a 50-pound or 100-pound load
capacity. It is supplied with a programmable cycle
control and an automatic supply injector and uses 125
gallons of water per wash cycle.
The Cissell L36SMS30 model dryer or tumbler has
a drying capacity of 50 pounds (dry weight) of laundry
perhourandaheatingcapacityof 130,000 Btu per hour.
It has a temperature-regulating thermostat, drying
timer, cool-down timer, and a start/stop button.
The Bock 205 model moisture extractor extracts
water from the clothes after rinsing by spinning the
clothes at a high rate of speed, applying centrifugal.
force, pushing the water to the outer surface, and
discharging it through the basket. The extractor is
equipped with a programmer that can be set for a 1- to
The centrifugal water pump has a self-priming
volute impeller. The only movable parts are the
impeller, seal rotating elements, and shaft. The pump
should pull a minimum vacuum of 20 inches of
The water heater is equipped with a fuel unit
assembly, oil burner control relay, ignition
transformer, fuel pump, and drawer assembly,"
consisting of electrodes, insulators, nozzle adaptor,
electrode support, and flame sensor, or fire eye.
Different sizes of storage tanks with a capacity
ranging from 6 to 85 gallons can be fitted to the skid
when the unit is ordered. The storage tank has a
maximum operating pressure of 100 psi.
In the paragraphs that follow, generic information
is provided about installation, start-up, operation, and
securing of this particular unit. This information is not
all-inclusive nor intended for all types of units. As each
laundry unit configuration is slightly different from the
next, you should always refer to the instruction
technical manual for the particular unit you are using.
Figure 2-21.Field galley grease trap.