Environmental Engineering Reference
In-Depth Information
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Diving conditions
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Safety procedures
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Inspection requirements
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Equipment delivery and acceptance
Storage-Facility Isolation
Underwater inspection can be performed safely whether or
not the facility is isolated from the distribution system. In either
case, safety procedures must be followed. The facility should be
as full as possible while allowing space for safe entry and exit. If
the facility cannot be isolated from use, underwater inspection
can still be performed, but operations should ensure that water is
entering the facility rather than exiting during the time of the
inspection. A constant and minimum flow rate should be main-
tained for the duration of the inspection procedure. This will help
provide a stable and safe environment.
Storage-Facility Access
The area around the access hatch should be cleaned before
opening. Previously disinfected equipment must be redisinfected
if it contacts the roof or other areas that have not been disin-
fected when entering the storage facility.
Initial Water Quality
The water in the facility should be sampled before entering
(and before placing any equipment within the facility). Several
samples should be taken from various locations to establish the
preinspection water quality. The test results should be recorded
for chlorine residual and turbidity (total coliform tests are also
recommended) for comparison purposes at the conclusion of the
inspection procedure.
Equipment and Personnel Requirements
Only dedicated equipment and clothing should be used for
underwater storage facility inspection. Equipment materials con-
tacting the potable water should not adversely affect the water
quality. Both self-contained underwater breathing apparatus
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