e. Flushing Pipes and Hoses. After a ship has completed its transfer of
sewage to the shore or tender, it is necessary to flush the hose with water.
In most cases, water from the ship's fire main is used to flush CHT discharge
piping, the discharge deck riser, and the hoses. When a ship does not have
the capability of flushing its discharge line and transfer hose with water,
the shore facility or tender should recover the hose, connect it to the nearest
seawater outlet, and flush the hose clean. The shore facility and some of the
tenders will be provided with a special adapter for connecting 4-inch hoses to
2 l/2-inch fire main systems. This adapter, the 4-inch, male cam-lock to
2 l/2-inch, male, fire hose thread-reducer adapter, is pictured in Figure 3-7.
f. IMCO Flange and Adapter. The standard IMCO sewage discharge connec-
tion is a flanged metric fitting. The flange, including detailed dimensions,
is illustrated in Figure 3-8. The IMCO flange is not compatible with the Navy
standard flange used on surface ship discharge connections. Consequently, in
order to enable Navy surface ships to interface with nonNavy facilities uti-
lizing IMCO flange-equipped hoses, a special Navy-to-IMCO adapter is required.
The female cam-lock to IMCO flange fitting is illustrated in Figure 3-9. Also,
a male cam-lock to IMCO flange fitting is required at Navy facilities so that
foreign vessels can discharge sewage while visiting U.S. Navy ports. The
4-inch, male cam-lock to IMCO flange adapter is illustrated in Figure 3-10.
3.2.3 SUBMARINES. All U.S. Navy submarines are being retrofitted with top-
side, above-the-waterline sewage connections so that sanitary tanks can be `
discharged to shoreside reception facilities.
a. Submarine Connections. A standard drydock fitting is being used with
a 2 l/2-inch, female fire hose thread as `illustrated in Figure 3-11. Discharge
to shoreside reception facilities is accomplished by using 2 l/2-inch,
cam-lock, quick connect/disconnect sewage hose.
b. Flushing Pipes and Hoses. Some submarines have the capability of
flushing their sewage pipes and discharge hoses before disconnecting; others
do not. Therefore, it is necessary to have two types of adapters available
for connecting sewage hoses to the standard drydock fittings. Submarines that
have the capability of flushing sewage hoses will require a 2 l/2-inch, male
fire hose thread to a 2 l/2-inch, male cam-lock adapter. This adapter can
also be used by the shore facilities and some tenders to connect 2 l/2-inch
sewage hose to the fire-fighting systems for the purpose of flushing sewage
hose. Submarines that do not have flushing capabilities will require a special
"T" adapter that can be connected to a 1 1/2-inch fire hose. This adapter has
a 2 l/2-inch threaded male end which connects into the drydock fitting; a
2 l/2-inch, male cam-lock, quick connect/ disconnect end which attaches to the
sewage hose; and a 1 1/2-inch, threaded, male end with a stop valve which con-
nects to a 1 l/2-inch fire hose. The adapter permits flushing of the sewage
hose with water prior to disconnecting. An additional adapter (2 l/2-inch,
female cam-lock to 4-inch, male cam-lock) is required to mate the sewage hose
to the pier sewage line. The submarine discharge fittings, adapters, and hoses
are illustrated in Figure 3-11.