Page 94 - Vessel Sanitation Program 2018 Construction Guidelines

VSP 2018 Construction Guidelines

<15 minutes. Written documentation from the data logger
manufacturer, such as a letter or instruction manual, must be provided
to verify that the features are secure.

22.14.2.9 Multiple Distribution Loops
When supplying POTABLE WATER throughout the distribution
network with more than one ring or loop (lower to upper decks or
forward to aft), there must be
• Pipe connections that link those loops and a single distant point
monitoring analyzer or
• Individual analyzers on each ring or loop.

A single return line that connects to only one ring or loop of a multiple
loop system is not acceptable. One chart recorder may be used to record
multiple loop readings.

POTABLE WATER distribution loops/rings supplied by separate
HALOGEN dosing equipment must include an analyzer chart recorder
at a distant point for each loop/ring.

23.0 Cross-Connection Control

23.1 Backflow Prevention
Use appropriate BACKFLOW prevention at all CROSS-CONNECTIONS. This may
include nonmechanical protection such as an AIR GAP or a mechanical
BACKFLOW PREVENTION DEVICE.

Install BACKFLOW PREVENTION DEVICES and AIR GAPS to be ACCESSIBLE
for inspection, testing, service and maintenance. If access panels are required, provide
panels large enough for testing, service and maintenance.

23.2 Air Gaps

AIR GAPS should be used where feasible and when water under pressure is not
required.

23.3 Atmospheric Vent
A mechanical BACKFLOW PREVENTION DEVICE must have an atmospheric
vent.

Provide an AIR GAP for the atmospheric vent.

23.4 Protect Against Health Hazards
Ensure that connections where there is a potential of a HEALTH HAZARD are
protected by AIR GAPS or BACKFLOW PREVENTION DEVICES designed to
protect against HEALTH HAZARDS.

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