Flowserve LN - Manual (Page 12)

LN, LNE, LNH, LNV, LNEV, LNC and LNEC USER INSTRUCTIONS ENGLISH 71576423 11-09
Page 12 of 32 flowserve.com
b) Install the baseplate onto packing pieces evenly
spaced and adjacent to foundation bolts.
c) Level with shims between baseplate and packing
pieces.
d) The pump and driver have been aligned before
dispatch however the alignment of pump and motor
half coupling must be checked. If this is incorrect, it
indicates that the baseplate has become twisted
and should be corrected by re-shimming.
e) If the pump is driven from a separate motor using
a vertical cardan shaft it is recommended that
there is 3/4 of a degree angular misalignment
between the drive and driven shafts and that any
supports for the drive shaft plummer blocks are
rigid and do not exhibit resonant frequencies.
f) If not supplied, guarding shall be fitted as
necessary to meet the requirements of EN292.
4.3 Grouting
Where applicable, grout in the foundation bolts.
After adding pipe work connections and rechecking the
coupling alignment, the baseplate should then be
grouted in accordance with good engineering practice.
Fabricated steel, cast iron and epoxy baseplates can be
filled with grout. Folded steel baseplates should be
grouted to locate their packing pieces. If in any doubt,
please contact your nearest service centre for advice.
Grouting provides solid contact between the pump
unit and foundation, prevents lateral movement of
running equipment and dampens resonant vibrations.
Foundation bolts should only be fully tightened when
the grout has cured.
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 is achieved by adding or removing shims
under the motor feet and also moving the motor
horizontally as required. In some cases where the
alignment cannot be achieved it will be necessary to
move the pump before recommencing the above
procedure.
For couplings with narrow flanges, use a dial indicator
gauge as shown. The alignment values are
maximums for continuous service.
0 - 0.2 m m
0 - 0.1 m m
Permissible misalignment limits at working
temperature:
•
Parallel alignment within 0.2mm TIR
•
Angular alignment within 0.1mm
Pumps with thick flanged non-spacer couplings can
be aligned by using a straight-edge across the
outside diameters of the coupling hubs and
measuring the gap between the machined faces
using feeler gauges, measuring wedge or callipers.