Figure 4-9.-FFG-7 start air system (simplified).
primary means of starting the GTMs during a
FFG-7 CLASS SHIPS. The last start air system
casualty. As you can see in figure 4-8, the air
we will discuss is the one installed on the FFG-7
pressure is reduced to a workable pressure by the
ships. This system is shown in figure 4-9.
HP/LP air reducing valve, which alleviates the need
for further pressure reduction. This design is very
If you look closely at figure 4-9, you should notice
similar to the one used on the CG-47 class ships.
there are three methods or sources of air for starting
the GTMs: (1) HP air, (2) LP (bleed) air from the start
The second method is using LP (bleed) air from
air compressors, or (3) LP (bleed) air from the cross-
the start air compressors. In this method, two start
bleed piping from the online GTM. You can use any of
air
the three methods, depending on the circumstances.
In most cases, HP air will be available and will be the