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 10-minute cycle.
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 mercury.
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.Continue Reading