Quantcast Draining

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Flushing may be carried on simultaneously for each ship-to-shore sewage
b.  Submarines. Normally, submarines can flush with salt water because
they are usually equipped with salt water fire-fighting systems.  In instan-
ces where they are not, the following steps are taken for flushing submarine
sewage hoses with clean salt water:
(1) Before the hoses are disconnected, a complete air blow of
each connection is made to force as much of the sewage remaining within the
hoses as possible into the pier sewer.
(2) The boat's hose handling crew closes the submarine's sewage
discharge riser valves, and the shore crew closes the pier sewer riser
(3) The boat's crew disconnects each sewage hose from the sub-
marine's sewage risers and aims the open end of the hose directly toward the
(4) The shore crew disconnects the shore end of the hoses from
the pier sewer risers and couples each hose to the pier salt water system
risers by means of adapters; the hoses should be lashed to prevent whipping.
Portable fire pumps can be used to provide salt water in instances when
pier salt water systems are not available.
(5) The salt water is turned on at the pier end of the hose, and
each hose is backwashes full bore into the harbor for 10 minutes.
8.1.3 DRAINING.  Draining takes place after completion of salt water flush-
ing, before the valve is closed on the pier sewer riser.  As much salt water
as possible should be drained from the hose and into the sewer.  This makes
the hose lighter and easier to handle, results in a cleaner hose, and reduces
the risk of spills during hose handling.
A hose which has been connected properly between the vessels and the
pier should hold very little water after flushing has been completed.
Draining procedures differ for hoses connected to gravity pier sewers and
for those connected to pier sewers which operate under pressure. In the
former case, there is no problem.  However, a pier sewer which continuously
or periodically operates under pressure may allow raw sewage from other ships
to run back up into the hose and recontaminate it, if draining steps are not
taken in proper sequence.  The following procedures are carried out as spec-
ified for each condition:
a.  Gravity Sewer. The hose is disconnected from the ship's riser.
Low spots in the hose which hang below the pier riser are lifted progres-
sively to an elevation above the pier riser, beginning away from the riser
and moving toward it.  This forces salt water in the hose to drain by gravity
into the pier sewer. After draining, close the valve on the pier riser.
b.  Pressure Sewer.  Drain the hose in the same manner as for a gravity
sewer.  If it is noted that water remains in the hose from back pressure at
the pier riser, the pier riser valve should be closed.  A heaving line is


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