by keeping the dissolved oxygen content of the boiler
water as low as possible.
The watersides of naval boilers may be cleaned in
two waysmechanically, by thorough wire brushing of
all drums, headers, and tubes; and chemically. by
circulating chemical cleaning solutions through the
Before mechanical cleaning of watersides is begun,
the internal fittings must be removed from the steam
drum. The fittings (particularly the steam separators and
apron plates) must be marked or otherwise identified as to
position in the steam drum to ensure their correct
reinstallation. All internal fittings must be wire brushed
and cleaned before they are reinstalled.
Cleaning the watersides of the generating tubes
requires a special tube cleaner. There are several types
available, but perhaps one of the most common is the
pneumatic turbine-driven tube cleaner shown in figure
1-31. This type of cleaner consists of a flexible hose, an
air-driven motor, a flexible brush holder, and an
expanding wire bristle brush. The turbine-driven motor
consists of a set of turbine blades made to revolve when
compressed air is admitted through the hose. The
turbine-driven motor, in turn, drives the wire brush.
There are several sizes of brushes available (figs. 1-32
and 1-33). Figure 1-34 shows a brush refill for the type of
brush shown in figure 1-32.
Before you start cleaning tubes, be sure that adequate
ventilation and lighting have been arranged. Someone
should also be stationed outside the drum to act as tender
Figure 1-32.Wire bristle brush for cleaning generating
and to assist whomever is working in the drum. Keep a
written checkoff list of all tools and equipment taken into
the watersides and be sure that the same tools and
equipment are removed.
With the air shut off, insert the tube cleaner in the
tube until the brush is about even with the far end of the
tube. Wrap friction tape, a rag, or some other marking
Figure 1-31.Boiler tube cleaner (pneumatic turbine-driven type).