Dry Installation - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

4.1.5 Dry installation

Install pumps in dry installation permanently in a pump room.
The pump motor is enclosed and watertight and will not be
damaged if the installation site is flooded with water.
For vertical, dry installations, type D, install the pump
on a permanent concrete foundation.
For horizontal, dry installations, type H, the pump is
mounted on a base plate from the factory.
1. Mark and drill mounting holes in the concrete foundation.
2. Fit the base plate or base stand on the concrete with anchor
bolts. Check the pull-out strengths required for bolts at the
end of this section.
3. Check that the base plate or base stand is horizontal or
vertical.
4. Fasten the pump to the base plate or base stand.
In order to facilitate service on the pump, we recommend that you
fit isolating valves on either side of the pump.
5. Fit the inlet and outlet pipes and isolating valves, if used, and
ensure that the pump is not stressed by the pipes.
6. Adjust the length of the power cables by coiling them up on a
relief fitting to ensure that the cables are not damaged during
operation, but remember to have enough cable length to be
able to service the pump. Fasten the relief fitting to a suitable
hook. Make sure that the cables are not sharply bent or
pinched.
7. Connect the power cables and the control cable according to
the wiring diagrams.
We recommend that you use a reducer between the
inlet pipe and the pump in dry installations. In
horizontal installations the reducer must be of the
eccentric type and must be installed so that the
straight edge is pointing upwards. In this way, the
accumulation of air in the inlet pipe is avoided and
the risk of disturbance of operation is eliminated.
Make sure that the pipes are installed without the use
of undue force. Do not allow loads from the weight of
the pipes to 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 pipes;
never use these elements as a means to align the
pipes.
The inlet and outlet pipes are bolted to the pump by means of
flange connections.
10
Foundation
To ensure minimum vibration levels, all parts of the system must
be sufficiently stiff and firmly anchored:
• The foundation and concrete must be of adequate strength to
support the weight of the pump including accessories, the
weight of the liquid passing through the pump, and the forces
generated by the pump.
• As a rule of thumb, the mass of the concrete foundation must
be minimum three to five times the mass of the supported
equipment and must have sufficient rigidity to withstand the
axial, transverse and torsional loads generated by these
machines.
• The foundation must be 6 in (15 cm) wider than the base plate
or base stand for pumps up to 470 hp (350 kW) and 9.8 in (25
cm) wider for larger pumps.
• The concrete used in the foundation must have a minimum
tensile strength of 363 psi (250 N/cm
• Always use an epoxy grout to fasten the pump base plate to
the foundation.
Pull-out strengths for anchor bolts
Installation type H and D
Dry installation Anchor bolts
ANSI 16" (DN 400)
ANSI 20" (DN 500)
6 x 1" (M24)
ANSI 24" (DN 600)
ANSI 32" (DN 800)
The pull-out strengths stated are without safety
factor. The required safety factor may depend on the
materials and the methods used for anchoring.
2
).
Pull-out strength
[kip (kN)]
5.6 (25)