Figure 3-2.Deaerating feed tank.
AUXILIARY STEAM SYSTEM
Auxiliary steam systems supply steam at the
pressures and temperatures required cooperate
many systems and machinery, both inside
and outside engineering spaces. As discussed
previously, auxiliary steam is often called
saturated steam or desuperheated steam.
Many steam systems and machinery receive
their steam supply from auxiliary steam systems
on most steam-driven ships. Some typical examples
are constant and intermittent service steam
systems, steam smothering systems, ships
whistles, air ejectors, forced draft blowers, and
a wide variety of pumps. Some newer ships use
main steam instead of auxiliary steam for the
forced draft blowers and for some pumps.
Aboard some ships, turbine gland sealing systems
receive their steam supply from an auxiliary steam
system. Other ships may receive their supply from
the auxiliary exhaust system. Gland sealing steam
is supplied to the shaft glands of propulsion and