MIL-HDBK-1005/16
e)
Sized to fit in a standard manhole without
disassembly
f)
Compact and portable for one-man installation
g)
Overall construction, including casing, of
materials resistant to corrosion (plastics, fiberglass, stainless
steel)
h)
Exterior surface painted a light color to reflect
sunlight
i)
Low cost, availability of spare parts, warranty,
ease of maintenance, reliability, and ruggedness of construction
11.6.3
Installation and Use
11.6.3.1 General Consideration. Sampling equipment will yield
good results only when properly installed and maintained. A few
general guidelines follow:
a)
When a sampler is installed in a manhole, secure
it either in the manhole (e.g., to a rung above the high water
line) or outside the manhole to an aboveground stake by means of
a rope.
b)
Place the intake tubing vertically or at such a
slope to ensure gravity drainage of the tubing between samples,
avoiding loops or dips in the line.
c)
Position the intake in the stream facing upstream.
Limit the orientation of the intake 20 degrees on either side of
the head-on. Secure the intake so that no drag is placed on the
inlet tubing.
d)
After the installation is complete, collect a
trial sample to ensure proper operation and sample collection.
The sampler must give replicate samples of equal volume
throughout the flow range. If the sampler imposes a reduced
pressure on a wastestream containing suspended solids, run the
first part of the sample to waste.
11.6.3.2 Winter Operation. For outdoor use in freezing
temperatures, use special precautions to prevent the collected
sample(s) from freezing:
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