nitrogen will only be used as a drive source for boost
Gaseous N i t ro g e n M o d u l e . -- T h e g a s e o u s
pump when compressed air is not available. Gaseous
nitrogen module (fig. 8-10) supplies unregulated
nitrogen used for recharging this unit shall conform to
compressed air (90 to 150 psig) or regulated gaseous
federal specification BB-N-411, type 1 (gaseous),
nitrogen (120 to 130 psig) to the oxygen module for
Class 1 (oil free), Grade B (99.5 percent pure, low
oxygen boost pump drive. Compressed air is the
moisture content).
primary drive source for the boost pump. Gaseous
Figure 8-10.--Gaseous nitrogen module.
8-17