Riser Pipe - Grundfos SP Series Installation And Operating Instructions Manual

Fig. 5 Crimping the connectors
Fig. 6 Applying heat to the connector
Fig. 7 Completed splices

3.4 Riser pipe

The riser pipe or hose should be
properly sized and selected based
Note
on estimated flow rates and friction-
loss factors.
3.4.1 If an adapter is required
It is recommended to first install the drop pipe to
the pipe adapter. Then install the drop pipe with
the adapter to the pump discharge.
A back-up wrench should be used when the riser
pipe is attached to the pump. The pump should
be gripped only by the flats on the top of the
discharge chamber. The body of the pump, cable
guard or motor should not be gripped under any
circumstance.
Pipe adapters
or
5" NPT
to
6" NPT
Fig. 8 Pipe adapters
3.4.2 If steel riser pipe is used
We recommend that steel riser pipes always be
used with the larger submersibles. An approved
pipe thread compound should be used on all
joints. Make sure the joints are adequately
tightened in order to resist the tendency of the
motor to loosen the joins when stopping and
starting.
When tightened, the first section of the riser
pipe must not come in contact with the check
valve retainer in the discharge chamber of the
pump.
After the first section of the riser pipe has been
attached to the pump, the lifting cable or elevator
should be clamped to the pipe. Do not clamp the
pump.
When raising the pump and riser section, be
careful not to place bending stress on the pump
by picking it up by the pump end only.
Make sure that the electrical cables are not
cut or damaged in any way when the pump is
being lowered in the well.
The drop cable should be secured to the riser
pipe at frequent intervals to prevent sagging,
looping or possible cable damage. Nylon cable
clips or waterproof tape may be used. The cable
splice should be protected by securing it with
clips or tape just above and below the splice.
3.4.3 If plastic or flexible riser pipe is used
It is recommended that plastic type riser pipe
be used only with the smaller domestic
submersibles.
When plastic riser pipe is used, it is
recommended that a safety cable be
Caution
attached to the pump to lower and
raise it.
Drop pipe
5" NPT
to
4" NPT
Pump discharge
7