6.6.2 If a steel riser pipe is used
Always use steel riser pipes with the large submersible pumps. Use
an approved pipe thread compound on all joints. Make sure the
joints are adequately tightened to prevent the joints from coming
loose when the motor starts and stops.
When tightened, make sure that the first section of the riser pipe
does not come in contact with the check valve retainer.
After the first section of the riser pipe is attached to the pump,
clamp the lifting wire to the pump, if there is a provision on the
pump for a lifting wire. If not, clamp the lifting wire to the first section
of the riser pipe.
When raising the pump and riser pipe section to vertical position,
make sure not to place bending stress on the pump by picking it up
at the pump end only.
Make sure that the power cables are not cut or damaged when the
pump is being lowered in the well.
Fasten the submersible drop cable to the riser pipe at frequent
intervals to prevent sagging, looping or possible cable damage.
Nylon cable clips or waterproof tape may be used. Protect the cable
splice by securing it with clips or tape just above and below the
splice.
6.6.3 If a plastic or flexible riser pipe is used
Use plastic riser pipes only with the smaller domestic
submersible pumps.
Important: Plastic and flexible pipes tend to stretch under
load. Take this stretching into account when securing the
cable to the riser pipe. Leave 3 to 4 inches (75 to 100 mm)
of slack between clips or taped points to allow for this
stretching. This tendency for plastic and flexible pipe to
stretch also affects the calculation of the pump installation
depth. As a general rule, plastic pipe stretches to
approximately 2 % of its length. For example, if a 200 feet
(61 m) of plastic riser pipe is installed, the pump may
actually be down 204 feet (62 m). If the installation depth
is critical, check with the manufacturer of the pipe to
determine how to compensate for pipe stretch.
When a plastic riser pipe is used, attach a safety cable to
the pump to lower and raise it.
When plastic pipes are used, secure the pump by an unloaded
straining wire to be fastened to the outlet chamber of the pump. See
the figure below.
TM001368
Fixing the straining wire
Contact the pipe manufacturer or representative to ensure that the
pipe type and physical characteristics are suitable for this use.
Use the correct joint compound recommended by the pipe
manufacturer. In addition, use a torque arrester when using a
plastic pipe.
Do not connect the first plastic or flexible riser pipe section directly
to the pump. Always attach a metallic nipple or adapter into the
valve casing on the top of the pump. When tightened, make sure
that the threaded end of the nipple or adapter does not come in
contact with the check valve retainer.
Fasten the submersible drop cable to the riser pipe at frequent
intervals to prevent sagging, looping and possible cable damage.
Grundfos nylon cable clips or waterproof tape may be used. Protect
the cable splice by securing it with Grundfos cable clips or tape just
above each joint.
Check valves
Always install a check valve on the top of the well. In addition, for
installations deeper than 200 feet (61 m), install check valves at no
more than 200 ft (61 m) intervals.
Protect the well from contamination
To protect against surface water entering the well and
contaminating the water source, make sure that the well is finished
off above grade and that a locally approved well seal or pitless
adapter unit is utilized.
14
English (US)
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