Flowserve VTP Wet Pit - Manual (Page 31)

VERTICAL TURBINE PUMPS (VTPS) CENTRIFUGAL PUMPS ENGLISH 71569224 – 10-13
Page 31 of 76 flowserve.com
Parallel
Angular
a) 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.
b) When the electric motor has sleeve bearings, it is
necessary to ensure that the motor is aligned to
run on its magnetic centerline.

Refer to the motor User Instructions for details.
If the motor does not run in its
magnetic center the resultant additional axial force
may overload the pump thrust bearing.
If the pump is handling hot liquid, the alignment must
be rechecked in warm condition of the unit. The
alignment of the unit shall be checked again after 200
service hours.
Piping 4.7
Protective covers are fitted to the pipe
connections to prevent foreign particles or objects
entering the pump during transportation and
installation. Ensure that these covers are removed
from the pump before connecting pipes.
Pipe work velocities 4.7.1
In order to minimize friction losses and hydraulic
noise in the pipe work it is good practice to choose
pipe work that is one or two sizes larger than the
pump suction and discharge.
Typically, main pipe velocities should not exceed 2
m/s (6 ft/sec) on the suction and 3 m/s (9 ft/sec) on
discharge.
Take into account the available NPSH that must be
higher than the required NPSH of the pump.
Never use the pump as a support for
piping.
Maximum forces and moments allowed on 4.7.2
VTP pump flanges (See table 4.6.2.1)
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 possible failure of the pump
casing. The following points should be strictly
followed.
a) Prevent
excessive external pipe load.
b) Never draw piping into place by applying force to
pump flange connections.
c) Do not mount expansion joints so that their force,
due to internal pressure, acts on the pump
flange.
Ensure piping and fittings are flushed
before use.
Ensure that the piping arrangement has been
provided to flush the pump before removal in cases
of hazardous liquid pumps.