Flowserve ESP3 - Manual (Page 40)

ESP3 USER INSTRUCTIONS ENGLISH 26999943 08-11
Page 40 of 64
6.6 Setting impeller clearance and
impeller replacement
A new impeller gasket [4590.2] must be installed
whenever the impeller has been removed from the
shaft. Impeller balancing instruction may be found in
section 6.8.
Do not adjust the impeller clearance with the seal set.
Doing so may result in seal leakage and/or damage.
The impeller could have sharp edges,
which could cause an injury. It is very important to
wear heavy gloves when handling the impeller.
It is recommended that two people
install a Group 3 impeller. The weight of a Group 3
impeller greatly increases the chance of thread
damage and subsequent lock-up concerns.
Do not attempt to tighten or loosen the
impeller on the shaft by hitting the impeller with a
hammer or any other object or by inserting a pry bar
between the impeller vanes. Serious damage to the
impeller may result from such actions.
Care should be taken in the handling
of high chrome iron impellers.
6.6.1 Impeller installation
The impeller is threaded to the shaft in a clockwise
direction (right hand threads). Apply a coat of grease
or anti-seize to the threads to allow for ease of
disassembly in the future. Install a new impeller
gasket [4590.2].
Using a strap wrench to hold the drive coupling,
screw impeller [2200] onto the end of the pump shaft
[2100] clockwise until snugly fit. A second strap
wrench may be utilized to fully tighten the impeller
and compress the impeller gasket [4590.2]. The
gasket must be fully compressed to ensure an
accurate and stable impeller setting.
If available, an impeller wrench may be utilized to
tighten the impeller. Using the shaft key [6700.2],
mount the impeller wrench to the end of the shaft.
The impeller wrench is placed on the shaft at the
coupling end with a key. With the impeller wrench in
place, grasp the impeller in both hands (wear heavy
gloves] and, with the impeller wrench handle to the
left (viewed from the impeller end of the shaft) spin
the impeller forcefully in a clockwise direction to
impact the impeller wrench handle on the work
surface to the right.
6.6.2 Impeller Removal
Remove the impeller [2200] by unscrewing it counter-
clockwise (looking in at the vanes).
Do not apply heat to the impeller. If liquid is
entrapped in the hub, an explosion could occur.
While holding the drive coupling with a strap wrench,
unscrew the impeller. Do not attempt to use a
crowbar as a lever to unscrew the impeller as
damage to the vanes may result. Use a strap wrench
or a piece of wood as a mallet. Discard the impeller
gasket [4590.2]
If available, an impeller wrench may be utilized to
loosen the impeller. Using the shaft key [6700.2],
mount the impeller wrench to the end of the shaft.
With the wrench handle pointing to the left when
viewed from the impeller end, grasp the impeller
[2200] firmly with both hands (wear heavy gloves).
By turning the impeller in the clockwise direction
move the wrench handle to the 11 o’clock position
and then spin the impeller quickly in a counter-
clockwise direction so that the wrench makes a
sudden impact with a hard surface on the bench.
After several sharp raps, the impeller should be free.
Unscrew the impeller and remove from the shaft.
Discard the impeller gasket [4590.2].
6.6.3 Impeller Setting
Several types of impellers are available for the ESP3
product. Reverse vane and Recessed impellers are
set off the rear cover. Open impellers and Lo-Flo
impellers are set off the casing. Impeller setting is
performed by adjusting the impeller to the correct
surface as described above and then adjusting it to
the correct gap. For services above 82 °C (180 °F)
add another two combinations of shaft keyway/sleeve
slots to the values listed.
6.6.3.1 Reverse vane and Recessed impeller
setting
a)
Rotate the shaft [2100] so that the impeller
adjustment key [6700.3] is toward you.
b) Remove the retaining ring [2530.2] and key
[6700.3] from the adjusting sleeve [3400].
c) Holding the shaft [2100] steady, turn the
adjusting sleeve [3400] clockwise until the
impeller [2200] is resting against the running
face of the cover [1220].