ARMY TM 10-4610-309-14
MARINE CORPS TM10802A-14/1
0008 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
PREPARATION FOR USE AND INSTALLATION INSTRUCTIONS
OCEAN INTAKE STRUCTURE SYSTEM (OISS) SET-UP OPERATION
UNDER UNUSUAL CONDITIONS
JETTING THE FIRST WELLPOINT
Each of the four wellpoints are jetted into the sand in essentially the same manner with a few changes in
connections. Refer to Figure 2 for an illustration of how various raw water system components are
assembled in order to jet a wellpoint.
1. Connect a 2 in. x 50 ft., green-banded raw water discharge hose from the discharge of the diesel-
driven pump to a 2 in. x 10 ft., yellow-banded OISS suction hose that is connected to the elbow of
the first wellpoint to be jetted.
WARNING
Water pressure will fluidize the sand and could create a large unstable area
surrounding the wellpoint. As a result, the person inserting the wellpoint could
sink below the surface of the water or under the sand. The person holding the
wellpoint must wear flotation gear and be tied to a safety line. Additional
personnel must be present to retrieve the individual if the individual falls or sinks
into the sand as it is fluidized. Failure to observe this warning may result in death
from drowning or suffocation.
2. Start the diesel-driven pump as described in WP 0014, Initial Start-Up or Start-Up with the
System Fully Drained, under the heading ESTABLISHING RAW WATER FLOW, to pump water
through the hoses, the riser and out the bottom of the wellpoint.
3. For low tide installations, one person holds the safety line and a second person remains near the
person installing the wellpoint. The second person holds the suction hose and assists the person
installing the wellpoint in the event the person falls or sinks into the sand as it is fluidized.
4. Move the wellpoint into position in a vertical orientation and insert the bottom of the wellpoint into
the sand. Do not force the wellpoint. Allow it to drive itself into the sand, raising and lowering the
wellpoint to wash fine material from the well location.
5. Continue jetting the wellpoint until the elbow or tee is just above the sand level.
6. Continue pumping water into the well point for five minutes to flush fine materials from the well.
During this five minute period, raise and lower the wellpoint about one ft. every ten seconds.
7. After flushing for five minutes, slow the diesel engine to idle speed.
0008 00-4
