Submerged Installation On Auto-Coupling; Free-Standing Submerged Installation - Grundfos SEG Notice D'installation Et De Fonctionnement

8.1 Submerged installation on auto-coupling

Pumps for permanent installation can be mounted on a stationary
auto-coupling guide rail system.
The auto-coupling systems facilitate maintenance and service as
the pump can easily be lifted out of the pit.
Warning
Before beginning installation procedures, make sure
FM
that the atmosphere in the pit is not potentially
explosive.
Make sure that the pipework is installed without the
use of undue force. No loads from the pipework
Note
Note
weight must be carried by the pump. We recommend
that you use loose flanges to ease the installation
and to avoid pipe tension at flanges and bolts.
Do not use elastic elements or bellows in the
Note
Note
pipework; these elements must never be used as a
means to align the pipework.
Auto-coupling guide rail system
See fig. 1 on page 54.
1. Drill mounting holes for the guide rail bracket on the inside of
the pit and fasten the guide rail bracket provisionally with two
screws.
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 heavy-duty expansion bolts. If the
bottom of the pit is uneven, the auto-coupling base unit must
be supported so that it is level when being fastened.
3. Assemble the outlet pipe in accordance with the generally
accepted procedures and without exposing the it to distortion
or tension.
4. Insert the guide rails in the auto-coupling base unit and adjust
the length of the rails accurately to the guide rail bracket.
5. Unscrew the provisionally fastened guide rail bracket, fit it on
top of the guide rails, and finally fasten it firmly to the pit wall.
The guide rails must not have any axial play as this
Note
Note
would cause noise during pump operation.
6. Clean out debris from the pit before lowering the pump into
the pit.
7. Fit the guide claw to the outlet port of the pump.
8. Slide the guide claw down the guide rails and lower the pump
into the pit by means of a chain fastened to the lifting bracket.
When the pump reaches the auto-coupling base unit, the
pump will automatically connect tightly.
9. 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 housing.
10. Adjust the length of the motor cable by coiling it up on a relief
fitting to ensure that the cable is not damaged during
operation. Fasten the relief fitting to a suitable hook at the top
of the pit. Make sure that the cables are not sharply bent or
pinched.
11. Connect the motor cable and the monitoring cable, if any.
The free end of the cable must not be submerged as
Caution
water may penetrate through the cable into the
motor.
10

8.2 Free-standing submerged installation

Pumps for free-standing submerged installation can stand freely
on the bottom of the pit or the like. See fig.
The pump can be mounted on separate feet (accessory).
In order to facilitate service on the pump, fit a flexible union or
coupling to the outlet pipe for easy separation.
If a hose is used, make sure that the hose does not buckle and
that the inside diameter matches that of the outlet port.
If a rigid pipe is used, the union or coupling, non-return valve and
isolating valve must be fitted in the order mentioned, when
viewed from the pump.
If the pump is installed in muddy conditions or on uneven ground,
we recommend that you support the pump on bricks or a similar
support.
1. Fit a 90 ° elbow to the pump outlet port and connect the outlet
pipe/hose.
2. Lower the pump into the liquid by means of a chain secured to
the lifting bracket of the pump. We recommended that you
place the pump on a plane, solid foundation. Make sure that
the pump is hanging from the chain and not the cable.
3. 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 housing.
4. Adjust the length of the motor cable by coiling it up on a relief
fitting to ensure that the cable is not damaged during
operation. Fasten the relief fitting to a suitable hook. Make
sure that the cables are not sharply bent or pinched.
5. Connect the motor cable and the monitoring cable, if any.
The free end of the cable must not be submerged as
Caution
water may penetrate through the cable into the
motor.
If several pumps are to be installed in the same pit,
the pumps must be installed at the same level in
Note
Note
order to allow for optimum utilization of pump
alternation.
2 on page 55.