LP oxygen shop servicing, and gaseous nitrogen
Operation
recharging. Aircraft servicing shall be performed in
The operational functions of the oxygen-servicing
ambient temperatures of 30F to 125F in various
unit are HP and LP aircraft oxygen servicing, HP and
environmental conditions. Figure 8-12 illustrates the
21. EXHAUST
1. NITROGEN STORAGE CYLINDERS
22. NO PILOT VALVE
2. OXYGEN STORAGE CYLINDER
23. NC PILOT VALVE
3. NITROGEN CYLINDER VALVES
24. RELIEF VALVE (2900 PSIG)
4. OXYGEN CYLINDER VALVE
25. PURIFIER
5. NITROGEN SUPPLY PRESSURE GAUGE (0-5000 PSIG)
26. FILTER
6. HP MANIFOLD
27. OXYGEN VENT VALVE
7. OXYGEN SUPPLY PRESSURE GAUGE (0-3000 PSIG)
28. REGULATOR INLET PRESSURE GAUGE (0-3000 PSIG)
8. NITROGEN SUPPLY VALVE
29. OXYGEN REGULATOR
9. PRE-SET REGULATOR
30. REGULATOR OUTLET PRESSURE GAUGE (0-3000 PSIG)
10. SHIP AIR CONNECTION
31. OXYGEN SERVICE CONNECTION
11. N2 RECHARGE CONNECTION
32. SERVICE HOSE
12. RECHARGE CHECK VALVE
33. SERVICE VALVE
13. FILTER
34. SERVICE ADAPTER CONNECTION
14. BOOST PUMP DRIVE PRESSURE GAUGE (0-200 PSIG)
35. HP SERVICE ADAPTER
15. BOOST PUMP DRIVE VENT
36. LP SERVICE ADAPTER
16. LP BURST DISC (180 PSIG)
37. LP ADAPTER BURST DISC (600 PSIG)
17. BOOST PUMP DRIVE VALVE
38. HP ADAPTER BURST DISC (2590 PSIG)
18. LP MANIFOLD
39. PRE SET REGULATOR FILTER
19. SELECTOR VALVE
40. HP SERVICE ADAPTER (AIRCRAFT)
20. BOOST PUMP
Figure 8-12.--Air/nitrogen boost pump drive and oxygen servicing flow schematic.
8-19
