MIL-HDBK-1005/16
h)
Select a sample pump capable of lifting a sample a
vertical distance of 20 feet (6.1 m) and maintaining a line
velocity of 2 to 10 fps (0.6 to 3.0 m/s).
i)
The importance of line velocity and isokinetic
conditions (intake velocity same as velocity of flow of water)
depends on the concentration and density of the filterable
suspended solids in the water, the sampling program requirements
for accuracy of suspended solids determinations, and any other
parameters affected by suspended solids concentrations. If a
sampling program requires maintaining isokinetic conditions, dial
adjustment of intake velocity is a desired feature.
j)
All materials should be examined to ensure that
they do not contaminate the sample.
k)
Exclude light from the sample storage compartment.
11.6.2.4 Sample Storage Subsystem. Discrete samples are subject
to considerably more error introduced through sample handling;
however, they provide opportunity for manual flow compositing and
time history characterization of a wastestream during short
period studies. The desired features of sample storage
subsystems include the following:
a)
Flexibility of discrete sample collection with
provision for single composite container
b)
Minimum discrete sample container volume of
0.13 gallons (500 milliter [mL]) and a minimum composite
container capacity of 2.0 gallons (7.57 L)
c)
Storage capacity of at least 24 discrete samples
d)
Containers of conventional polyethylene or
borosilicate glass and of wide-mouth construction
e)
Capability for cooling samples by refrigeration or
a space for packing ice and maintaining samples at 39 to 43F (4
to 6C) for a period of 24 hours at an ambient temperature range
between -22 to 122F (-30 to 50C)
f)
Adequate insulation for the sampler to be used in
either warm or freezing ambient conditions
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