can damage the pump impeller. If this situation develops, the up-line pumps
must be monitored for an increase in discharge pressure above 155 psi. If
discharge pressure exceeds this limit, engine speed must be manually reduced
to idle until the down-line pump can be started.
If discharge pressure
still exceeds 155 psi, the up-line pumps must be shut down and restarted
when the down-line pump becomes operational.
e. The lead pumping station is equipped with lengths of rigid-walled,
wire-reinforced suction hose for connecting to the water source (a PWS/DS).
This hose does not collapse at low suction pressure. Each pumping station
is equipped with a check valve installed in the discharge line. This check
valve closes and prevents water from flowing back through the pump in the
event of a pumping station failure.
A gear-actuated butterfly valve is
installed in the suction and discharge lines. These valves can be closed to
isolate the pumping station from the hose line.
4. Before you begin any TWDS operation make sure all soldiers under your
Physical damage to the environment should be minimized
during field operations.
The potential for environmental damage at the
distribution site is greater due to the high volume of traffic coming
through the area. Point out that every effort should be made to identify
early any equipment/vehicle fluid leaks so that they can be cleaned up and
properly disposed of as soon as possible. Emphasize that the use of live
vegetation for camouflage during training should be discouraged because of
its detrimental effects on the environment. Ensure vehicles using your area
of operations stick to established traffic patterns and park in designated
areas to minimize environmental damage.
Once operations are completed,
environmental damage should be repaired to the greatest extent possible.
PART B - SUPERVISE TWDS SITE/ROUTE SELECTION
1. Prior to installing TWDS equipment, a thorough study of the terrain is
A general route for hose line and general locations for the
pumping stations, storage assemblies, and distribution points are determined
from examination and comparison of maps, photographs, and charts.
elements to be considered in selecting a route and installation sites for
a. Whether the TWDS will operate independently or as part of a larger