UNIREX Pump - Manual (Page 44)

MARK 3 USER INSTRUCTIONS ENGLISH 71569102 08-06
Page 44 of 68 flowserve.com
The above procedure is fairly straightforward when
doing the final setting of the impeller. However it can be
quite laborious when doing the preliminary setting in
order to establish the location of the mechanical seal.
For this reason, the following practice is recommended.
Before the pump is taken out of service, adjust the
impeller until it touches the casing and then rotate the
bearing carrier until the desired impeller clearance is
obtained. Identify this location on the bearing carrier
and then rotate the bearing carrier until the impeller
contacts the rear cover. Record the distance from the
desired impeller clearance setting to when the impeller
contacts the rear cover. The pump is now removed
from the casing and taken to the shop for maintenance.
When it is time to set the seal, the impeller is simply set
off the rear cover by the same distance recorded earlier.
The above technique is only applicable if all
of the original pump components are reinstalled. If
the casing, cover, impeller or shaft is replaced this
method must not be used.
6.6.3 Installation and clearance setting for
Sealmatic pumps
Install the repeller [2000.1] and covers [1220 and
1220.1] as described in section 6.9.3. Install a seal
guide from the Mark 3 tool kit to hold the repeller in
place. Set the repeller 0.38 to 0.51 mm (0.015 to
0.020 in.) off the cover following the instruction above
in section 6.6.1. Uniformly tighten the set screws
[6570.3] in incremental steps up to the final torque
value to lock the bearing carrier in place. Remove the
seal guide and install the impeller. Check the impeller
setting with a feeler gage. The gap should be 0.38 to
0.51 mm (0.015 to 0.020 in.). If the gap is outside of
the correct setting, it may be readjusted to get the
beat gap at the repeller and impeller.
6.7 Disassembly
6.7.1 Power end removal
a) Before performing any maintenance, disconnect the
driver from its power supply and lock it off line.
Lock out power to driver to prevent
personal injury.
b) Close the discharge and suction valves, and
drain all liquid from the pump.
c) Close all valves on auxiliary equipment and
piping, then disconnect all auxiliary piping.
d) Decontaminate the pump as necessary.
If Flowserve Mark 3 pumps
contain dangerous chemicals, it is important to
follow plant safety guidelines to avoid personal
injury or death.
e) Remove the coupling guard. (See section 5.5.)
f) Remove the spacer from the coupling. Close
coupled pumps required that the motor be
removed from the pump assembly. The motor
must be fully supported and the jackscrews
[6575] loose before removal.
g) Remove casing fasteners [6580.1]. On Group 1
In-Line pumps the studs [6572.1] must be
removed.
h) Remove the fasteners holding the bearing
housing foot to the baseplate. (Not applicable on
In-Line pumps).
i) Move the power end, rear cover, and seal chamber
assembly away from the casing. On In-Line pumps
the simplest method of power end removal is to first
remove the motor and motor adapter with a crane.
However this is often not practical and the power
end must be removed by hand. This operation is
illustrated in figures 6-7, 6-8 and 6-9. Discard the
casing/cover gasket [4590.1].
The power end and rear cover
assembly is heavy. It is important to follow plant
safety guidelines when lifting it.
j) Transport the assembly to the maintenance shop.
Figure 6-7
Figure 6-8
Figure 6-9