UNIREX Pump - Manual (Page 22)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 22 of 68 flowserve.com
Mark 3 design (old)
If an adjustment is necessary, the adjuster nut
[6576] is used to move the footpiece up or down.
g) The spacer coupling gap is verified.
h) The parallel and angular vertical alignment is
made by shimming under the motor.
i) The motor feet holes are again centered on the
motor mounting studs using the centering nut. At
this point the centering nut is removed and
replaced with a standard nut. This gives
maximum potential mobility for the motor to be
horizontally moved during final, field alignment.
All four motor feet are tightened down.
j) The pump and motor shafts are then aligned
horizontally, both parallel and angular, by moving
the pump to the fixed motor. The pump feet are
tightened down.
k) Both horizontal and vertical alignment is again
final checked as is the coupling spacer gap.
See section 4.8, Final shaft alignment .
4.5.2 In-Line initial alignment procedure
The factory alignment proceed procedure ensures
that the unit may be aligned in the field. The initial
alignment is no more than 0.38 mm (0.015 in.)
parallel, and 0.0025 mm/mm (0.0025 in./in.) angular
misalignment.
The Mark 3 In-Line incorporates motor alignment
capabilities. Parallel alignment is achieved by
moving the motor adapter and motor as an assembly
relative to the power end. Four adjustment screws
(as shown in figures 4-7 and 4-8) allow for precise
changes in parallel alignment. Angular alignment is
controlled by machining tolerances, but cannot
prevent uneven cover gasket compression.
a) Check angular alignment. Additional torque may
be applied to the appropriate casing bolts to
correct angularity.
b) Check parallel alignment within a plane defined by
the adjusters at opposite corners of the motor
adapter. To make corrections, the motor adapter
nuts [6580.3] must be slightly loosened to allow the
motor adapter to move. All adjusters except for the
one in the desired direction of motor movement
should be loosened during adjustment. Tighten the
adjuster slowly against the stud until desired
alignment numbers are reached.
c) Check parallel alignment within a plane 90
degrees from the first. Corrections are made as
described in the previous step.
d) Several iterations between planes may be
necessary. Tighten all fasteners and recheck
alignment.
Figure 4-7
Figure 4-8
4.6 Piping
Protective covers are fitted to both the
suction and discharge flanges of the casing and must
be removed prior to connecting the pump to any pipes.
4.6.1 Suction and discharge piping
All piping must be independently supported, accurately
aligned and preferably connected to the pump by a
short length of flexible piping. The pump should not
have to support the weight of the pipe or compensate
for misalignment. It should be possible to install suction
and discharge bolts through mating flanges without
pulling or prying either of the flanges. All piping must be
tight. Pumps may air-bind if air is allowed to leak into
the piping. If the pump flange(s) have tapped holes,
select flange fasteners with thread engagement at least
equal to the fastener diameter but that do not bottom
out in the tapped holes before the joint is tight.
4.6.2 Suction piping
To avoid NPSH and suction problems, suction piping
must be at least as large as the pump suction
connection. Never use pipe or fittings on the suction
that are smaller in diameter than the pump suction size.