waste disposal- Gash compactor

Question 1

what is the purpose of a garbage disposal machine?

Answer 1

reduce the volume of general ship waste by means of shredding and compaction prior to its disposal

Question 2

list some of the sub-assemblies of a gash compactor

Answer 2

• frame
• top hopper
• shredder
• intermediate hopper
• horizontal compactor
  -vertical compactor
• container loading system
• panels
• hydraulic system
• operator control panel

Question 3

explain the operation of the shredder

Answer 3

the shredder consist of a shredding chamber with a series of intermeshing cutters, a speed reduction gearbox and hydraulic drive motor.
The hooks along with the counter rotation of the shafts produce a shearing effect, which pulls the garbage into the chamber and shreds it

Question 4

explain the function of the horizontal compactor

Answer 4

the horizontal compactor forms the first stage of compaction and consists of the compactor chamber, ram head assembly and two hydraulic cylinders

Question 5

explain the function of the hydraulic system

Answer 5

The hydraulic system provides the main motive power for the shredder drive motor and foe the cyclinders, which operate the horizontal and vertical compactors, pressure plate and container loading systems.
the system is designed to run on Ox40 but OM33 maybe used

Question 6

what is the capacity of the oil tank ? and the filtration of the oil strainer?

Answer 6

150 litres
120

Question 7

what dose the hydraulic pump deliver litres/min at what bar?

Answer 7

40 litres/min at 140 bar

Question 8

what are the three pressure switches ?

Answer 8

system low pressure (15 bar)
shredder overload (135 bar)
vertical compaction (125 bar)

Question 9

what is the start routine for the hydraulic system?

Answer 9

• stop/start switch to be operated
• hydraulic pump runs up and discharges 140 bar
  -pressured oil flows around the system and up to the 5 solenoid operated control valves
• these valves are closes, ad compacting hasn’t started
• therefore the system runs off load through the bypass valve diverting the system to the tank
• to start the compacting process, start process button is pressed
• the system logic will send a control signal to operate one of the solenoid control valves, operating the shredder, vertical, horizontal compactor or pressure plate
• the bypass valves close simultaneously, stopping the floe of oil back to the tank
• the system operation is dependent on control system logic operating the solenoid control valves in sequence

Question 10

what is the process of two man operation

Answer 10

• two persons are required to manual at operate the actuators
• the first person is to press one of the two manual push buttons on the side of the relevant soliend
• the second person is to now operate the manual push button on the side of the bypass valve
• the actuators will now move
• to stop movement the button on the bypass valve is released first, followed by the control valve

Question 11

explain the function of an air supply solenoid valve

Answer 11

A solenoid valve that is fitted to the rear of the machine to isolate the LP air supply to the sensors when the machine is isolated or when the top hopper is open

Question 12

what is the purpose of the LP air filter/regulator

Answer 12

to reduce air pressure from 10 bar to 3 bar

Question 13

what are the hydraulic alarm, the colours and their parameters ?

Answer 13

• high temperature - RED - when hydraulic fluid has exceeded 54 degrees in the tank and 60 in the system
• low level -RED - low level of hydraulic fluid in the tank
• low pressure - RED- hydraulic fluid pressure witt in the system has dropped below 15 bar

Question 14

when carrying out an COSHH assessment what information should be referred to ?

Answer 14

• JSP 395(F)
• Hazard data sheets