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 APPENDIX A
SEWAGE TRANSFER HOSE DISINFECTION PROCEDURES
A.1 OPTIONAL DISINFECTION PROCEDURES. As discussed in the text, the
10-minute flushing with salt water usually will be sufficient to clean the
sewage hoses. However, if a strong sewage odor persists after the 10-minute
flush, additional cleaning is required. The first step in providing addi-
tional cleaning is to connect the hose to the pier salt water system and
flush the hose over the side for an additional 10 to 20 minutes.
If a strong odor remains after the second flushing, additional cleaning
and disinfection of the hoses should be carried out at the hose storage and
cleaning facility. The procedure will take place either on a wash rack or a
wash apron (see Section 3.3.2 and Figures 3-14, 3-15, and 3-16). The recom-
mended disinfectant for this procedure is commercial grade calcium hypo-
chlorite (HTH). This material should be used only in the hose cleaning and
storage area, and should not be permitted to come into contact with fuels,
oils, or grease because of its oxidizing characteristic.
Equipment and materials for cleaning and disinfecting hoses include the
following:
Chlorine Solution
Chlorine Powder (HTH)
Detergent Solution
Hot Water Tank
Chlorine Solution Tank with Aspirator
Reduced Pressure Principle Backflow Prevention
Device
Chlorine Residual Comparator or Precision Test Paper
Manufactured by Wyandotte Chemical Corp.,
Wyandotte, Michigan 48193
Fresh Water
Experience shows that flushing with fresh water is relatively ineffec-
tual and cleaning by this means cannot be assured. Fresh water is used only
when disinfecting with chlorine (HTH), or for washing with detergent. Fresh
water is admitted to the hose inlet manifold only through a reduced pressure
principle backflow prevention device.
The cleaning procedure begins with used hoses laying in straight lines
adjacent to the hose cleaning rack or on the hose washing apron. The steps
listed below are then followed (see Figure A-l):
a. If the cleaning will take place on the washing rack, the number of
hoses that can be accommodated are placed upon the rack; to do this, both
members of the shore crew proceed to the end of the hose length that is
closest to the head end of the rack. They lift the end onto the rack and
connect it with the inlet manifold at that end. Then the two men move along
the length of the hose, one man lifting and one man adjusting the hose on
the rack; when they reach the opposite end, they pick up the fitting at that
end and attach it to a U-bend with a hose adapter. Next, they pick up the
A-1
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