Page 83 - Vessel Sanitation Program 2018 Operations Manual

VSP 2018 Operations Manual

5.4.1.2.3 Halogen Backup Pump (06)
At least one backup HALOGEN pump must be installed with an
active, automatic switchover feature to maintain the free residual
HALOGEN in the event that the primary pump fails, an increase in
demand occurs, or the low chlorine alarm sounds.

5.4.1.2.4 Chemical Injection Dosing Point (06)
A check valve or nonreturn valve must be installed between the
distribution halogen and pH pumps and the injection points. In
addition,
• The potable water distribution halogenation and pH
chemical injection dosing points must be located on the
delivery line downstream of the potable water pumps, OR
• If the injection dosing point is before the potable water
pumps, it must be located above the chemical dosing tanks.

5.5 Potable Water System Halogen Monitoring

5.5.1 Halogen Analyzer-Chart Recorder

5.5.1.1 Installation

5.5.1.1.1 Distant Point (06)
A HALOGEN analyzer-chart recorder must be installed at a distant
point in the POTABLE WATER distribution system where a
significant water flow exists and represents the entire distribution
system. In cases where multiple distribution loops exist and no
pipes connect the loops, there must be an analyzer and chart
recorder for each loop.

5.5.1.1.2 Data Logger
Electronic data loggers with CERTIFIED DATA SECURITY
FEATURES may be used in lieu of chart recorders.

If used, written documentation from the data logger manufacturer,
such as a letter or instruction manual, must be provided to verify
that the features are secure.

5.5.1.2 Operation

5.5.1.2.1 Maintenance (06)
The HALOGEN analyzer-chart recorder must be properly
maintained and must be operated in accordance with the
manufacturer’s instructions.

5.0 Potable Water; 54