Flowserve MNV - Manual (Page 18)

MNV & MNZ USER INSTRUCTIONS ENGLISH 71569188 11/04
Page 18 of 47
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4.5 Initial alignment
Ensure pump and driver are isolated
electrically and the half couplings are disconnected.
MNV/MNZ pumps are shipped from
the factory without the line shaft, pump or motor
couplings mounted. The couplings are mounted in
the field. Refer to the shafting manufacturer’s
instruction manual to determine the type of coupling
supplied with your unit.
Mount interference fit couplings by heating them
evenly in an oven to approximately 135 o C (275 o F).
This is required as the coupling flanges are designed
for an interference fit per AGMA Standard 9002. Do
not alter this fit. Upon removal from the oven,
position the hubs on the shafts, as required.
DO NOT hammer on the flanges in an
attempt to remove them from the shaft. To do so will
permanently damage the bearings in the pump
and/or the motor. Interference fit couplings have to
be removed by applying heat and a puller. The
alignment must be checked after the pump is
completely piped up.
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. In pump installations
involving high liquid temperatures, the unit should be
run at the actual operating temperature, shut down
and the alignment checked immediately.
4.5.2 Alignment methods
Ensure pump and driver are isolated
electrically and the 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. 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.
4.5.3 Alignment Procedure
a) Set the pump with its support on the foundation.
Use shims to level and raise the pump in a vertical
direction. Ensure that the suction and discharge
flanges are level, plumb, and at the proper
elevation.
b) Place the motor on the motor base. Move and
shim beneath the motor base as necessary to
ensure that:
• The distance from the motor coupling to the
pump coupling is correct
• The motor to pump coupling offset is that
required to produce the correct misalignment
• The motor coupling and pump coupling are
level to one another
c) Tighten the motor base foundation bolts and
recheck the span, offset, and coupling level.
Grout the base in place.
d) Set the motor to pump coupling offset by sliding
the motor on the base.
e) Secure the motor to the motor base.
f) Install the intermediate shafting with the guide
bearing(s) in place. If more than one section of
the shaft is used. Check the shafting alignment.
The universal joints must be placed so that
the yoke ears on each section of shaft are in line with
one another. If the yoke ears are not aligned,
equipment vibration will be increased.
All the shafting misalignment must occur in
one plane; i.e., if the shafting were placed on a sheet
of paper, all of the sections must contact the paper
along their length with no sections protruding out of the
paper.
g) Align the guide bearings to the shaft by shimming
beneath the guide bearing as necessary. Secure
the guide bearings to the foundation. Recheck the
guide bearing and shafting alignment.
h) Tighten the pump foundation bolts and grout the
pump in place. Dowel the motor to the motor base
(two dowels diagonally opposed), and recheck
alignment.
Due to the many variations and complexity
of installations, it is recommended that a Flowserve
Pump Division Service Representative be hired to
assist in installation and alignment on long shafted
vertical units.