Environmental Engineering Reference
In-Depth Information
quality. Although it may seem time consuming or unnecessary to
perform each sanitary practice, experience has shown that the
steps actually save time because they reduce the failure rate of
bacteriological tests. Failed tests can necessitate rechlorination
or sometimes require reinstallation.
Keep Pipe Clean and Dry
The interior of pipes and pipeline fittings must be protected
from contamination during installation. The openings must be
sealed with watertight plugs or other suitable plugs when the
construction is halted and personnel are not present to ensure
that animals or debris do not enter the pipe.
Ops Tip
Keeping the pipe clean during installation is the single most
important factor that results in successful disinfection.
As pipe is delivered to the site and if it is strung along the
trench, precautions should be taken to prevent material from
entering the pipe. Any delay in the installation of delivered pipe
can lead to possible contamination (Figure 3-1). One precaution is
to cover the ends of the pipe if it is not installed on the delivery day
(Figure 3-2). Pipe may be purchased and delivered with covered
ends; this practice prevents foreign material from entering the
pipe.
Joints
The joints should be connected in the trench before stopping
work. Plugs should remain in place to prevent water or mud from
entering the pipe.
Packing Materials
Packing material made of molded or tubular rubber rings,
rope of treated paper, or other approved materials (ANSI/NSF
Standard 61) should be used. Jute or hemp materials are not
approved for this purpose.
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