Flowserve FRBHJC - Manual (Page 20)

FRBHJC USER INSTRUCTIONS ENGLISH 71569179 11-04
Page 20 of 42
®
Mount the magnetic base on the pump half coupling hub
and place the dial indicator button on the outside
diameter of the driver half coupling hub. Note that the
length of extension rods should be kept at a minimum to
reduce deflection. Rotate the pump shaft and record
the dial reading at the top, bottom and each side.
Correct the parallel alignment by adding or removing
shims under the driver and/or moving the driver
horizontally. Repeat this procedure until the maximum
total indicator reading (T.I.R.) is within 0.076 mm (0.003
inch.)
Angular Alignment:
With the magnetic base mounted on the pump half
coupling hub, move the dial indicator button to indicate
on the face of the driver half coupling hub as close to
the outside diameter as possible. Turn both shafts 360
°
and record the dial readings at 90
°
intervals. Adjust the
shims under the motor as required and repeat the
procedure until the angular alignment is within 0.0005
mm (T.I.R.) per mm (0.0005 inch per inch) of maximum
hub diameter.
Repeat the checks on parallel and angular alignment,
ensuring the mounting bolts are secure, until the unit is
properly aligned. Note that correction in one direction
may affect the alignment in another direction. Re-check
the gap between the coupling hubs.
If any difficulty is encountered in achieving the
recommended alignment tolerances, the runout of the
pump and driver shafts and each coupling hub diameter
and face should be checked. Occasionally, due to
practical and unavoidable manufacturing tolerance
build-up associate with the pump, coupling and driver, it
may be necessary to match up the two coupling hubs in
the most advantageous relative angular position in order
to achieve an acceptable alignment.
Do not install the coupling spacer or sleeve until
grouting is complete and cured and the alignment is re-
checked.
When the electric motor has sleeve bearings it is
necessary to ensure that the motor is aligned to run
on its magnetic centreline. 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.
V-Belt Drive Units:
Check that both sheaves are free of grease, rust, nicks
or burrs. Install the correct size sheave on the pump
shaft and locate the sheave axially to minimize
overhang. Re-check the impeller axial clearance and
ensure that the pump is properly secured to the
baseplate. Install the driver on the adjustable base
provided and install the driver sheave in line with the
pump sheave. Ensure that the sheaves are tight on the
shafts. With a dial indicator, check the run-out on the
periphery and face of each sheave to ensure that each
is running true. Tighten the adjustable base and check
that the driver rotation in the correct direction and that
vibration levels are not unacceptable.
Checking V-Belt Sheave Alignment