Vessel Sanitation Program Operations Manual fill 2010
Sample Cross-connection Control Program Guideline
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14.6 Sample Cross-connection Control Program Guideline14.6.1 BackgroundUnprotected cross-connections to the potable water system can result in mild changes to the aesthetic quality of the water affecting taste, odor and color to severe changes which can result in illness or death. The purpose of a cross-connection control program is to identify these connections and provide appropriate protection. 14.6.2 IntroductionUse this outline to either develop a comprehensive cross-connection control program or to update and maintain an existing program. 14.6.3 Cross-connection SurveyOne of the first steps in developing a cross-connection control program is to conduct a thorough survey of the potable water system to identify all actual or potential cross-connections. While an initial survey of the vessel can be time consuming it is essential to ensure that all connections are identified so that appropriate protection can be decided upon. Protection of potable water can take two forms: containment or complete protection. While the former may be the objective for a water supplier and requires less time and detail for this guidance the latter will be our objective. To illustrate the following example is provided: A surveyor enters a structure and identifies numerous connections to the potable water, both non-health-hazard and health-hazard connections. For containment purposes an RP assembly on the exterior supply line downstream of the water meter would contain all of the hazards within the structure but would do nothing to protect the individual connections within the facility. If complete protection is the goal each cross-connection in the structure must be identified and a decision made as to the appropriate backflow prevention method to be used. For vessels under the VSP complete protection is the goal. Surveyors should be
Surveyors should physically inspect all areas of the vessel that are supplied with potable water. The best approach for this may be to go deck by deck, starting with the decks that have connections which pose the greatest risk to health. This may require starting with the engine room deck. As each connection is identified they are added to a listing. All of the information related to this connection should also be added to the listing. An example of required information can be found later in this outline. Connections that are found to be unprotected or inadequately protected must be addressed as quickly as possible especially if the connection is a health hazard. 14.6.4 Backflow Protection MethodsAll graphics provided courtesy of the United States Environmental Protection Agency (USEPA) 14.6.4.1 Nonmechanical Backflow Protection
Air-gap
Antisiphon loop
14.6.4.2 Mechanical Backflow Protection
Atmospheric vacuum breaker 
Hose-bib vacuum breaker 
Double check with atmospheric vent 
Pressure vacuum breaker 
Reduced pressure principle assembly
14.6.5.1 List of connections requiring backflow prevention on vessel. A log listing of all cross-connections on the vessel must be developed. At a minimum the log should contain the data elements listed in columns 2, 3, 6, 7, and 8. The inclusion of the additional data listed below is recommended.
14.6.5.2 Specific Backflow Protection Choices on Vessel: Air-gaps and backflow prevention devicesUse this section to provide information to vessel staff on the specific backflow prevention devices used on the vessel. For each device a copy of the specification sheets or technical sheets as well as the manufacturer’s installation recommendations should be included in the program documentation file. Generally these documents are available online from the websites of each device manufacturer.
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