MIL-HDBK-1005/16
Table 20
Comparison of Sample Gathering Subsystems
Feature
Mechanical
Forced Flow
Suction Lift
Allowable lift
High
High
Limited to 25 feet
height to
(7.6 m) or less
sample
container
Sample
Possible
Possible with
Possible with
pumps but not
multiple intakes
over the entire
with ejection
depth
units
Obstruction to
Significant
Less than
Very little
flow
mechanical
subsystem
Explosion proof
Some
Pneumatic
Some
ejection units
meet this
requirement
Dissolved
No problem
No problem
Not suited, but if
gasses
used the initial
flow should be
discarded
Fouling
Exposed parts
Intake tubing of
Not easily
have a
fouled
less than 1/4 inch
tendency to
(6 mm) inside
foul
diameter is prone
to fouling
Sample volume
Suitable for
Pump suitable
Should be
wide range
for wide range;
independent of
pneumatic
vertical lift
ejection units
suitable for
sample volume
Flexibility
Limited
Moderate
Maximum
Maintenance
Heavy
Moderate but
Little
costly
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