Installing The Motor - Grundfos MTS Serie Montage- Und Betriebsanleitung

Dry installation
Using the holes in the motor flange, the pump can be
fastened to a mounting foot which must be placed on
a level surface. The drain must point downwards, so
turn the pump cover on the drive side, if necessary. A
mechanical shaft seal ensures a long service life.
Drain
Fig. 5 Dry installation

3.1.3 Installing the motor

These instructions are only necessary if the pump
unit is to be assembled on site.
Keep the coupling halves properly aligned
when slipping them on.
Do not knock or hit any components of the
pump.
1. Apply a very thin coat of molybdenum disulfide
®
(such as Molykote ) to the shaft ends of pump
and motor.
2. Insert the shaft keys.
3. Slip on the pump-side and motor-side coupling
halves. Follow the description in Appendix,
section Coupling assembly.
– If a mounting fixture is not available, remove
the rubber bushes and heat the coupling
halves up to approximately 100 °C.
4. Tighten the set screws on both coupling halves.
5. Lift the motor and position it on the pump bracket.
6. Screw in the motor bolts.
3.1.4 Planning the pipes
Supports and flange connections
Keep the coupling halves properly aligned
when slipping them on.
Do not knock or hit any components of the
pump.
1. Calculate the pipe forces, taking every possible
operating condition into account, such as these:
– are flange loads according to EN ISO 14847?
– are pipes cold or warm?
– are pipes empty or full?
– are pipes depressurized or pressurized?
– have flanges changed position?
2. Make sure the used pipe supports do not
damage the pipes due to friction and do not lose
flexibility due to corrosion.
8
Outlet Inlet
Pipe diameters
Keep the flow resistance in the pipes as low as
possible.
Suction side:
• Make sure the nominal suction pipe diameter is
not smaller than the nominal suction port
diameter.
• Make sure the flow velocity is below 1 m/s.
Discharge side:
• Make sure the nominal discharge pipe diameter
is not smaller than the nominal discharge port
diameter.
• Make sure the flow velocity is below 3.28 m/s.
3.1.5 Pipe lengths
Suction
Fig. 6 Recommended lengths of a straight pipe
to and from the pump suction and
discharge sides
A > 5 x nominal suction pipe diameter
B > 5 x nominal discharge pipe diameter
Observe the recommended minimum lengths of a
straight pipe when installing the pump.
Suction side: Shorter lengths of a straight pipe are
possible but may limit the hydraulic performance.
Discharge side: Shorter lengths of a straight pipe are
possible but can result in increased operating noise.
Discharge