Flowserve MARK 3 GROUP 4 - Manual (Page 22)

MARK 3 GROUP 4 USER INSTRUCTIONS ENGLISH 71569286 08-12
Page 22 of 48 flowserve.com
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required and repeat the procedure until the angular
alignment is within 0.0005 mm (T.I.R.) per mm
(0.0005 in. per in.) 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 run-out 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.
4.5.5 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
4.8,
Final shaft alignment check
up to and including
section 5,
Commissioning, start-up, operation and
shutdown
before connecting driver and checking
actual rotation.
4.6 Grouting
The purpose of grouting is to provide rigid support to
the pump and driver by increasing the structural
rigidity of the baseplate and making it an integral
mass with the foundation. Grouting should only be
completed after baseplate has been levelled (4.4)
and initial pump alignment (4.5).
Clean the roughed foundation surface and build a
wooden form around the baseplate. For initial
grouting forms should be placed to isolate shims and
levelling nuts. The foundation surface should be
thoroughly saturated with water before grouting. A
typical mixture for grouting-in a pump base is
composed of one part pure Portland cement and two
parts of clean building sand with sufficient water to
provide the proper consistency. The grout should
flow freely but not be so wet as to cause the sand
and cement to separate.
Thoroughly puddle the grout while pouring to
eliminate air pockets and low spots. Pour sufficient
grouting to ensure that the bottom surface of the
baseplate is completely submerged. Do not fill
isolated areas around the shims or levelling nuts.
Once the grout has set sufficiently, remove the
wooden forms and finish off the sides and top as
desired. At the same time, roughen the grout surface
inside the baseplate. Cover with wet burlap and
allow the grout to cure for at least 40 hours.
After grouting has cured, shims and levelling nuts
should be removed or backed off. Tighten down
baseplate to the new grout to put bolts in tension and
ensure rigidity of structure. Install jam nuts and cut
the bolts to the desired length. Finish grouting
isolated areas. Fill the baseplate including pump and
driver support pedestals with concrete. Trowel and
slope the surface to give suitable drainage.