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HANDLING OIL SPILLS
Figure 6-3.Strainer-type CHT system

Engineering Administration - Administrative Structural engineering guide book
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SHIPBOARD SEWAGE AND WASTE DISPOSAL The  environmental  harm  caused  by  sewage discharges  into  rivers,  harbors,  and  coastal  waters  by naval ships is of great concern. Secretary of Defense regulations  require  the  Navy  to  control  sewage discharges.  Navy  policies  and  responsibilities  are defined in the Environmental and Natural Resources Program  Manual,  OPNAVINST  5090.1. The  Navy  intends  that  all  naval  ships  will  be equipped with marine sanitation devices (MSD) that will allow them to comply with the sewage discharge standards without compromising mission capability. However,  sewage  discharge  regulations  do  not  forbid overboard discharge during an emergency when there is danger to the health and safety of personnel. In the past, shipboard  sewage  has  been  discharged  overboard routinely. We changed that practice when evidence showed  that  concentrations  of  sewage  in  inland  waters, ports, harbors, and coastal waters of the United States were  bad  for  the  environment. In  1972  the  Chief  of  Naval  Operations  decided  that the  Navy  would  install  the  sewage  collection,  holding, and transfer (CHT) system (a type of MSD) aboard Figure 6-2.-Comminutor-type CHT system. 6-4







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