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 A.2 DECREASING SHIP-TO-SHORE SEWAGE HOSES. When hoses are disconnected
from a ship after a 10-minute salt water flush and a grease buildup is noted
in the hose, a decreasing procedure should be carried out. A standard pro-
cedure for cleaning grease from pipes in a sewage collection system or at a
treatment plant is to charge the lines with a live stream. This procedure
was performed on a ship-to-shore sewage hose that had been connected to a
submarine tender for a continuous period of 7 months. There was no heavy
buildup of grease in the hose, but a thin black film was noted. The hose
was connected to a 11/2-inch steam outlet which had a static pressure of
100 psi; the valve was cracked to permit full inflation of the collapsible
rubber hose. The steam was allowed to flow through the hose for 10 minutes,
and a film of grease was observed on the condensate flowing from the inver-
ted end of the hose. The temperature of the 50-foot hose coupling further-
most from the riser was only slightly lower than the temperature of the
riser. There was no apparent damage to the hose, and it withstood a 100 psi
hydraulic test after the decreasing sequence.
For decreasing a sewage hose, the same layout as for hose disinfection
should be followed. The steam should be passed through the hose as described
above, and a bucket should be placed at the lower end of the hose to collect
the dislodged and melted grease for disposal in a landfill qualified to
receive this type of material. After decreasing is completed the hose should
be disinfected as described in Section 1 of this appendix before being placed
in storage.
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