Flowserve HED Worthington - Manual (Page 18)

HED/HED-DS USER INSTRUCTIONS ENGLISH 85392695 – 06/14
Page 18 of 64
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BLOCK TO BE REMOVED
AFTER THE SEALING
Figure 4.5
TOP OF FOUNDATION
PRIMARY
CONCRETE
SEALING
Figure 4.6
4.5 Initial alignment
4.5.1 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.
4.5.2 Alignment methods
Ensure pump and driver are isolated
electrically and the half couplings are 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.
4.5.2.1 Shaft/Coupling alignment
Shaft alignment must be correct for
successful operation. Rapid wear, noise, vibration
and actual damage to the equipment may be
caused by shaft misalignment. The shafts must
be aligned within the limits given within this
section.
Adjustment to correct the alignment in one
direction may alter the alignment in another direction.
Always check in all directions after making any
adjustment.
Coupled equipment must be aligned to minimise
unnecessary stresses in shafts, bearings and
coupling. Flexible couplings will not compensate for
appreciable misalignment. Foundation settling,
thermal expansion or nozzle loads resulting in
baseplate/foundation deflection and vibration during
operation may require the full coupling misalignment
capability.
4.5.2.1.1 Types of misalignment
There are two types of shaft misalignment: angular
and offset. Therefore, two sets of measurements and
corrections are required. Both types of misalignment
can occur in horizontal and vertical planes and are
present in most applications.
A)
Angular misalignment
In angular misalignment, the centre line of the shafts
intersects, but are not on the same axis.
Figure 4.7
B) Offset
misalignment
In offset misalignment, the shaft centre lines are
parallel but do not intersect.
Figure 4.8 – offset misalignment