TM 10-4610-241-10
TO 40W4-13-41
2-7. ROWPU ASSEMBLY AND PREPARATION FOR USE - cont.
o.1
Setup Raw Water System Using Ocean Intake Structure - cont.
(14)
Remove cover from raw water pump No. 1 receptacle on junction box. Connect raw water pump
No. 1 electrical cable to the receptacle.
(15)
Check security of all hose coupling connections.
(16)
At this time, fill the suction hose and pump with water and start the pump. Depending on the
amount of water in the suction hose, the pump should prime within a few minutes. Once the
pump has been primed, water will begin gushing from the jetting shoe of the first wellpoint.
(17)
With water flowing from the jetting shoe and while holding the wellpoint in the vertical position,
proceed to drill the wellpoint into the ocean floor by gently pushing wellpoint downward. The
wellpoint will drive itself down because of the water pressure.
NOTE
An up-and-down, as well as a turning motion may ease the drilling of the wellpoint.
Depending on ocean floor conditions, it may be necessary to support the wellpoint and
riser because of the fast drilling action of the wellpoint as it goes downward through the
ground.
(18)
Drill the wellpoint until the elbow fitting on the end of the riser is approximately one foot above
the ocean floor.
NOTE
The first wellpoint will be used as the source of water for the installation of the second
wellpoint.
(19)
Disconnect the 10-foot length of 2-inch suction hose from the 50-foot length of hose on the driven
wellpoint.
(20)
(21)
(22)
(23)
Disconnect the 2-inch Cam-Lock cap that is on the tee assembly and the hose opposite it.
Attach the 10-foot length of 2-inch suction hose from the driven wellpoint to the tee assembly.
On the opposite end of the tee, attach the 2-inch Cam-Lock cap.
Connect hose from discharge of pump to the 10-foot hose on the second wellpoint.
WARNING
When installing the wellpoint(s), the area near the hole may fluidize creating a wide hole.
This could result in loss of solid footing and the operator could fall into the hole being
drilled. This could result in death by drowning. Ensure that there is someone nearby
who may render assistance while wellpoints are being drilled.
NOTE
Remove the plastic boot from the second wellpoint before pumping water into it.
(24)
Prime and energize the pump. Depending on the amount of water in the suction hose, water will
start pumping and begin gushing from the jetting shoe of the second wellpoint.
(25)
Position the second wellpoint in the vertical position, at least 10 to 20 feet from the first wellpoint.
Change 2 2-66.3
