Submerged Installation On Auto Coupling - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

4.1.4 Submerged installation on auto coupling

Pumps for permanent installation can be installed on a stationary
auto coupling and operated completely or partially submerged in
the pumped liquid.
Before installing the auto-coupling base unit, ensure the quality
and strength of the concrete foundation. See the pull-out
strengths required for anchor bolts at the end of this section. To
ensure adequate pull-out strength, we recommend that you weld
the threaded bushings to the steel reinforcement in the concrete.
For auto-coupling installations, types S (submerged
without cooling jacket) and C (submerged with
cooling jacket), the guide claw is mounted on the
outlet flange from factory.
1. Drill mounting holes for the guide rail bracket on the inside of
the pit and fasten the guide rail bracket provisionally with
twoanchor bolts.
2. Place the auto-coupling base unit on the bottom of the pit.
Use a plumb line to establish the correct positioning. Fasten
the auto coupling with anchor bolts. If the bottom of the pit is
uneven, support the auto-coupling base unit so that it is level
when being fastened.
3. Connect the outlet pipe in accordance with the generally
accepted procedures and without exposing the pipe to
distortion or tension. Do not allow loads from the weight of the
pipes to be carried by the auto coupling.
4. Fit the guide rails. An intermediate guide rail bracket is
required if guide rails are more than 20 ft (6 m) long. Place the
guide rails on the auto coupling, then place the guide rail
bracket on the guide rails and fasten the guide rail bracket to
the pit wall. Tighten the anchor bolts.
5. Clean out debris from the pit before lowering the pump into
the pit.
6. Before lowering the pump into the wet pit, check the cables
visually for cuts or ruptures which may have been caused by
rough handling during transportation or installation.
7. Slide the guide claw of the pump between the guide rails and
lower the pump into the pit by means of a certified chain
secured to the lifting bracket of the pump. When the pump
reaches the auto-coupling base unit, the pump will
automatically connect tightly.
8. Hang up the end of the chain on a suitable hook at the top of
the pit and in such a way that the chain cannot come into
contact with the pump.
9. Adjust the length of the power cables, but remember to have
enough cable length to be able to make service on the pump.
Make sure that the cables are not sharply bent or pinched. Fix
the cables at the top of the pit in such a way that no extra
cable slides into the pit.
10. Connect the power cables and the control cable.
Avoid pipe tension at flanges and bolts.
The free end of the cables must not be submerged,
as water may penetrate through the cables into the
motor.
Pull-out strengths for anchor bolts
Auto-coupling base
Bolts
unit
ANSI 10" (DN 250) 4 x 1" (M24)
ANSI 12" (DN 300) 4 x 1" (M24)
ANSI 20" (DN 500) 6 x 1 1/4" (M30)
ANSI 24" (DN 600) 6 x 1 1/4" (M30)
ANSI 32" (DN 800) 6 x 1 1/4" (M30)
The pull-out strengths stated are without safety
factor. The required safety factor may depend on the
materials and the methods used for anchoring.
Pull-out strength
[kip (kN)]
6.7 (30)
9.0 (40)
9.0 (40)
9.0 (40)
4.5 (20)
9