Flowserve Gearex Rotary Gear Pumps External and Internal Bearing - Manual (Page 25)

EXTERNAL GEAREX USER INSTRUCTIONS ENGLISH 71569246 (2167B-E1)
Flowserve Pump Division 25
®
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. (See Fig. 3).
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. (See Fig. 4). 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.
Figure 4
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 4.9
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.
Clean the roughed foundation surface and build a
wooden form around the baseplate (see Fig. 1). 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.
After the concrete has cured, and while the pump and
driver are uncoupled, the driver rotation should be
checked. Be sure that the driver is locked out after this
check. Note that the required pump shaft rotation is
marked on the front head of the pump (see section 5.3
Direction of rotation)