Section III. TECHNICAL PRINCIPLES OF OPERATION

TM-5-4310-393-14 Air Compressor Diesel Engine Driven 20 CFM 3200 PSI Model KA7-DA Manual
Page Navigation
9

TM 5-4310-393-14 Section III. TECHNICAL PRINCIPLES OF OPERATION Paragraph Page 1-12 Compressor ............................................................................................................ 1-9 1-13 Pneumatic Air Flow ................................................................................................. 1-9 1-14 Purifiers .................................................................................................................. 1-9 1-12. COMPRESSOR. The compressor is driven at a speed of 1300 rpm. When a pressure of 3200 psi is reached in the vessel being filled, the safety relief valve on the fill hose assembly will open to atmosphere. The first stage of the compressor block is connected to the second stage with a tube that serves as an intercooler. The purpose of the intercooler is to reduce the interstage temperature of the air, increasing the unit volume and ultimately the volumetric capacity for the entire multi-stage reciprocating compressor. The second stage discharge is passed through another intercooler to an oil/water separator, and then to the inlet of the third stage The third stage discharges to an aftercooler tube which is connected to a final oil/water separator. From the final oil/water separator, the air is tubed to a final purification cartridge and then through a pressure maintaining valve to a service port. Manual condensate drain valves are provided at each of the two oil/water separators. These separators should be drained every 15 to 20 minutes during operation of the compressor, and after the unit is shutdown for the day. 1-13. PNEUMATIC AIR FLOW. Refer to Figure 1-3 Compressed Air Pneumatic Flow Diagram. The 1^st stage draws in atmospheric air through an intake prefilter (1) The air then goes through the intake hose (2), and through a 10 micron intake air cleaner filter (3). The air Is drawn into the first stage cylinder (4) and is compressed to 56 psi (4 bar). The pressurized air is cooled between the first and second stages by an Intercooler (5). In the second stage cylinder, air is compressed to 500 psi (35 bar) and then passes through a second Intercooler (7) and enters an oil/water separator (8). From the oil/water separator (8) the air enters the third stage cylinder (9), where it is compressed to 3200 psi (221 bar), the operating pressure of the unit. The air is cooled again by passing through an aftercooler tube (10) and most remaining oil/water is removed by the final oil/water separator (11). The air is then cleaned by the purification cylinder (13). Air leaving the purification cylinder goes through a pressure maintaining valve. A fill hose assembly is provided between the pressure maintaining valve and the service air outlet (20). Air pressures are safety maintained by safety relief valves at each compressor stage and by a safety relief valve placed in the fill hose assembly. Check valves (12) are Installed on each side of the purification cylinder to prevent back flow of air into the system from a service air cylinder which might be above system pressure or contaminated Manually operated drain valves (15 and 16) are installed for each oil/water separator (8 and 11). The purification purge valve (17) will depressurize the system when opened. 1-14. PURIFIERS The compressed air is rendered free from most of the heavy oil and water by an oil/water separator between the second and third stage, and by an oil/water separator after the third stage. Final purification of the air is accomplished by the purification cylinder located after the final oil/water separator. The purification cylinder contains a dryer/purifier cartridge which removes all residual oil and water vapors, providing treated air, free of oil, taste, and odor for respiratory use by divers 1-9

Privacy Statement
Press Release
Contact