Best Practices for Prevention of Backflow and Backsiphonage

  • • During construction of the ship or renovation, there should be strict inspections by highly qualified individuals to determine that cross-connections do not exist.
  • • When repair work is done, it is essential that highly trained supervisors make sure that cross-connections have not been installed in various piping systems.
  • • All individuals who hook up hoses must be under close supervision by highly competent people to prevent the potential for cross-connections.
  • • All potable water pipes and hoses should be painted or striped with an easily seen blue color at least every 15 feet and around partitions, bulkheads, and decks. No blue color should be used on piping downstream of any reduced pressure devices.
  • • All other pipes and hoses should have distinct colors representing the contents that they are transporting. A color chart should be posted at regular intervals explaining what each of the pipes and hoses may transport.
  • • Create an air gap between the potable water line and a receiving tank or sink. The air gap must be at least twice the diameter of the potable water line.
  • • Use mechanical types of backflow preventers such as: atmospheric vacuum breakers, hose bib vacuum breakers, pressure vacuum breakers, and double check valves, and in case of fires, double check detectors. (See endnote 37 for details including illustrations and discussion.)
 
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