4.3 Grouting
4.3.1 Base plate grouting
a)Prepare the site for grouting. Before grouting clean the foundation surface thoroughly and provide external barriers as shown:
b)Prepare grouting product (concrete, resin) in accordance with manufacturers' instructions.
c)Use grouting products with
d)To grout up to the required level. Polish surfaces. Take necessary precautions to avoid air bubbles.
e)
f)After grout starts to cure, definitively tighten anchor bolts.
g)Control the alignment such as described as follows.
4.4 Initial alignment
Before connecting the couplings verify the motor rotation direction.
4.4.1 Thermal expansion
The pump and motor will normally have to be aligned at ambient temperature and should be corrected to allow for thermal expansion at operating temperature. In pump installations involving high liquid temperatures, the unit should be run at the actual operating temperature, shut down and the alignment checked immediately.
4.4.2 Alignment methods
Ensure pump and driver are isolated electrically and the half couplings are disconnected. Ensure that the pump pipework, suction and discharge, is disconnected.
The alignment MUST be checked.
Although the pump will have been aligned at the factory it is most likely that this alignment will have been disturbed during transportation or handling. If necessary, align the motor to the pump, not the pump to the motor.
Alignment
Parallelism and concentricity check:
Check the alignment at three or four points, before piping assembly.
with a rule | with a comparator |
Admissible margin for a motor with roller bearings with European couplings:
=0.15 mm parallel checking
=0.1 mm angular checking
For US supplied couplings values to be used are:
=0.02 in. parallel checking
=0.05 in. angular checking
Check the couplings manual for further details.
Angular checking:
with a sliding rule | with a caliper gauge |
The alignment will be definitive only after pipe connection (see § 4.5.4).
If necessary, improve the machine alignment:
Complete unit mounted on common base plate: The machines are first aligned accurately in our workshops. Usually, any misalignment observed on site is due to a wrong adjustment under the base plate (disturbed during transport or because of forces exerted by the piping).
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