2012 Ocean Ranger Guidebook Revision 3-7-12 - Alaska ...

2012 Ocean Ranger Guidebook 3-7-12
Background: Hoses on the ground could pick up contamination, particularly if there are leaks on the
hose.
What to check for: Check that hoses
are elevated to minimize contact with
the ground.
Citation: See 6.1.c.
Job Aid Item: 6.1.e
Figure 4- Hose elevated above ground.
Text: Potable water system free of cross connections or has backflow prevention IAW 18 AAC 80.025.
Background: When a ship connects to a municipal water system there is a potential for contamination to
enter if there are cross-connections on the ship and there is no backflow protection. This is a health
concern for any source
connected to a municipal
system. A backflow
preventer is commonly
attached to the
connection on the docks
utility or metering
system. Some vessels
have their own backflow
preventer as well. Some
systems have flow
direction indication, flow
indicators may identify
possible back flow. Back flow may occur when the pressure of the vessels potable system (tanks) is
greater than the supply (shore) system pressure.
What to check for: Check that backflow protection is used either at the source of the potable water or
onboard before the distribution system. If no backflow connector, search for potential sources of
cross- contamination.
Citations:
18 AAC 80.025. Cross-connections prohibited and backflow protection
(a) A person may not construct, install, or use of a cross-connection in a public water system, or allow a
water system that contains a cross-connection to connect to a public water system.
(b) If the department determines that a facility has the potential to contaminate a public water system
through backflow, the owner of the public water system shall install, maintain, and test on the water
service line to and at other locations in that facility, a backflow prevention device that conforms to
182