Flowserve LR Worthington - Manual (Page 14)

LR, LRV, LLR and LR-S USER INSTRUCTIONS ENGLISH 71569088 08-10
Page 14 of 48 flowserve.com
Parallel
Angular
Maximum permissible misalignment at working
temperature:
Parallel 0.2 mm (0.008 in.) TIR
Angular 0.1 mm (0.004 in.) TIR
When checking parallel alignment, the total indicator
read-out (TIR) shown is twice the value of the actual
shaft displacement.
Align in the vertical plane first, then horizontally by
moving motor. When performing final alignment, check
for soft-foot under the driver. A TIR indicator placed on
the coupling, reading in the vertical direction, should not
indicate more than 0.05 mm (0.002 in.) movement when
any driver foot fastener is loosened.
While the pump is capable of operating with the
maximum misalignment shown above, maximum pump
reliability is obtained by near perfect alignment of 0.05
to 0.10 mm (0.002 to 0.004 in.) TIR parallel and 0.05
mm (0.002 in.) per 100 mm (4 in.) of coupling flange
diameter as TIR angular misalignment. This covers the
full series of couplings available.
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.
When the electric motor has sleeve bearings it is
necessary to ensure that the motor is aligned to run
on its magnetic centreline.
Refer to the motor manual for details.
A button (screwed into one of the shaft ends) is
normally fitted between the motor and pump shaft
ends to fix the axial position.
If the motor does not run in its
magnetic centre the resultant additional axial force
may overload the pump thrust bearing.
4.5.3 Check for soft foot
This is a check to ensure that there is no undue
stress on the driver holding down bolts; due to non-
level baseplate or twisting. To check, remove all
shims and clean surfaces and tighten down driver to
the baseplate. Set a dial indicator as shown in sketch
and loosen off the holding down bolt while noting any
deflection reading on the dial test indicator - a
maximum of 0.05 mm (0.002 in.) is considered
acceptable but any more will have to be corrected by
adding shims, for example, if the dial test indicator
shows the foot lifting 0.15 mm (0.006 in.) then this is
the thickness of shim to be placed under that foot.
Tighten down and repeat the same procedure on all
other feet until all are within tolerance
Complete piping as below and see sections 4.7,
Final shaft alignment check, up to and including
section 5, Commissioning, startup, operation and
shutdown, before connecting driver and checking
actual rotation.
4.6 Piping
Protective covers are fitted to the pipe
connections to prevent foreign bodies entering during
transportation and installation. Ensure that these
covers are removed from the pump before connecting
any pipes.
4.6.1 Suction and discharge pipework
In order to minimize friction losses and hydraulic
noise in the pipework it is good practice to choose
pipework that is one or two sizes larger than the
pump suction and discharge. Typically main
pipework velocities should not exceed 2 m/s (6 ft/sec)
suction and 3 m/s (9 ft/sec) on the discharge.
Take into account the available NPSH which must be
higher than the required NPSH of the pump.