Figure 4-8.-DDG-51 start air system (simplified).
with fewer valves. Instead of using five valves, the
As we indicated earlier, the start air systems we have
DDG-51 start air system does the same job with only
just discussed are found on the CG-47, DD-963, and
two valves. The console controls are also much
air DDG-993 class ships. In the following paragraphs,
simpler in design. At the DDG-51 console, you will
will point out the differences found on the two
have only one of two choices to maketo use HP air or
remaining systems installed on the DDG-51 and
bleed air to start the engine.
FFG-7 class ships.
In the DDG-51 start air system, another design
DDG-51 CLASS SHIPS. The start air system on
difference is that the HP-to-LP air reducing station
the DDG-51 class ships shares some basic similarities
outlet that is 75 psig. In the DDG-51 system, an
with the systems we have already described. If you
orifice pack is not installed because additional air
study figure 4-8 and compare it to figure 4-7, you can
pressure reduction is simply not necessary.
see the start air system for the DDG-51 class ships
performs the same functions as the DD-963 system