13.
14.
If necessary to remove a flexible hose con-
figuration from the system, examine the
interior of the hose for cracks or other
signs of deterioration of the inner liner.
Do not damage the liner by trying to
dislodge sea growth. Do not remove the
end fittings from any section of hose that
is to be installed.
Presence of identification tag.
Storage
The following guidelines are recommended for
proper storage of hose and fittings:
Hose—Hose should be stored in a dark,
dry atmosphere away from electrical equip-
ment; temperature should not exceed 125°“F.
Storage in straight lengths is preferred, but
if hose is to be coiled, take care to ensure
the diameter of the bend is not less than 3
feet. To prevent damage during storage,
wrap the hose with burlap or other suitable
Reusable end fittings—Protect all threads
material.
damage.
with tape or other suitable material, and
wrap the entire fitting in a protective
covering to prevent nicking or other
Shelf Life
The following are shelf life requirements for hose
and reusable end fittings:
Hose—Do not install reinforced rubber hose
that is over 4 years old from the date of
manufacture. This time is measured from the
quarter and year of manufacture but does
not include the quarter year of manufacture.
Consider the shelf life of hose ended upon
installation aboard ship. To ensure against
its accidental use, dispose of any hose not
installed that has exceeded the above shelf
life.
Reusable end fittings—There is no shelf life
for end fittings. They should be replaced on
an individual basis when examination makes
them suspect.
Servicing
No servicing or maintenance is required since
hose or fittings must be replaced at the slightest
suspicion of potential failure. If a fitting is
removed from a section of hose, that hose section
must not be reused, regardless of its service life.
Service Life of Rubber Hose
All rubber hose has a periodic replacement time.
All flexible rubber hose connections will be replaced
every 5 years ( * 6 months) in critical systems and
every 12 years in noncritical systems. Wire braided
Teflon hose has no specified shelf or service life.
Its replacement is based on inspection of the hose
for excessive wear or damage.
FITTINGS
Some type of connector must be provided to at-
tach the pipe, tube, or hose to the other components
of the system and to connect sections of the line to
each other. There are many different types of con-
nectors (commonly called fittings) provided for this
purpose. Some of the most common types of fittings
are covered in the following paragraphs.
Threaded Joints
The threaded joints are the simplest type of
pipe fittings. Threaded fittings are not widely used
aboard modern ships except in low-pressure water
piping systems. The pipe ends connected to the
union are threaded, silver-brazed, or welded
into the tail pieces (union halves); then the two
ends are joined by setting up (engaging and
tightening up on) the union ring. The male and
female connecting ends of the tail pieces are
carefully ground to make a tight metal-to-metal
fit with each other. Welding or silver-brazing the
ends to the tail pieces prevents contact of the
carried fluid or gas with the union threading.
Bolted Flange Joints
Bolted flange joints (fig. 9-53) are suitable for
all pressures now in use. The flanges are attached
Figure 9-53.—Four types of bolted flange piping joints.
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