WDX USER INSTRUCTIONS ENGLISH 71576322 06-05
Page 18 of 46
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Paral lel
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
anydriver foot fastener isloosened.
While the pump is capable of operating with the
maximum misalignment shown above, maximum pump
reliabilityis 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 asTIR 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 calipers.
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.
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
The user must verify that the equipment is
isolated from any external sources of vibration.
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 must be higher
than the required NPSH of the pump. When
determining the NPSH available the vapour pressure
at the operating temperature must be taken into
account.
Never use the pump as a support for
piping.
Maximum forces and moments allowed on the pump
flanges vary with the pump size and type. To
minimize these forces and moments that may, if
excessive, cause misalignment, hot bearings, worn
couplings, vibration and the possible failure of the
pump casing, the following points should be strictly
followed:
Prevent excessive external pipe load
Never draw piping into place by applying force to
pump flange connections.
Do not mount expansion joints so that their force,
due to internal pressure, acts on the pump flange.
It is recommended that expansion joints use
threaded rod to limit any forces of this type.
Thermal expansions must be compensated in
such a way that no additional forces act on the
pump flanges.
Make sure that piping flanges are square and
concentric to the pump flanges.
