generator turbines to seal the shaft glands against
leakage. This leakage includes air leaking into the
turbine casings and steam leaking out of the
turbine casings. More use of electrically driven
(rather than turbine-driven) auxiliaries has
simplified auxiliary steam systems on newer ships.
SUMMARY
In this chapter, you have learned about the
main steam system, the auxiliary steam system,
and the use of steam after it leaves the boiler.
Remember, steam and feedwater are recycled over
and over again to provide heat and power to
operate machinery. It is important that you
understand the terminology associated with steam
and feedwater systems. You will use these terms
in your day-to-day routine aboard ship. Some of
the subjects will be discussed in greater detail in
later chapters. All of these areas are important
in their own right. As you learn this information,
you will become a more proficient and reliable
technician.
3-6
