residual. When the storage tanks have at least 1 foot of water, check the
chlorine level in the product water as follows:
a. Use the available chlorine color comparator test kit. Take a water
sample from the dispensing nozzle. Allow the water to flow for 30 seconds
before the collecting sample.
b. Unless otherwise directed by the medical team or a Surgeon General
directive, the pump must be adjusted to provide a chlorine residual of 5 ppm
in warm water (over 50 degrees F), and 10 ppm in cold water (at or below 50
degrees F).
c. Use the chlorine residual test result to calculate the proper pump
setting as follows:
Test Results ...................................
4 ppm
Required .......................................
5 ppm
Pump Stroke ....................................
60
New Stroke Setting is ..........................
5/4 X 60 = 75
d. Ensure that your operators perform this adjustment every hour. It
is critical that this residual is maintained so that disinfection can
continue once the water leaves the distribution point.
18. It is essential that the amount of polyelectrolyte be optimized to
provide the lowest turbidity with the least amount of polyelectrolyte.
Failure to carry out this procedure will result in insufficient filtration
and rapid accumulation of dirt on the RO elements. This dirt or fouling of
the elements will decrease the amount of product water produced, lead to
early failure of the RO elements, and possible failure to complete the
assigned mission.
Polyelectrolyte optimization should be performed after
the first hour of operation if polyelectrolyte is being used. Ensure that
the operator performs the following steps:
a. Setup and calibrate the in-line turbidity meter. Record the initial
turbidity meter reading and the polyelectrolyte injection pump settings to
the Optimization Log.
b. Increase the stroke setting in increments of 5, wait ten minutes,
and record the new turbidity reading.
Continue to increase the stroke
setting by 5, waiting ten minutes and then recording the new turbidity
reading. As the stroke increases, the turbidity level should decrease and
then level out at the optimum setting. Never run at less than the initial
setting as determined by the water type during the initial polyelectrolyte
setup.
QM4911
1-14
Previous Page
