Flowserve HED Worthington - Manual (Page 39)

HED/HED-DS USER INSTRUCTIONS ENGLISH 85392695 – 06/14
Page 39 of 64
d) Slide oil rings onto shaft apart from lower half
sleeve bearing
e) Carefully lift pump shaft just enough so that lower
half sleeve bearing can be removed.
f) Unbolt and remove lower half of line bearing
housing.
g) Unscrew set screws and remove inboard and
outboard oil shields together with labyrinth rings.
Remove oil rings.
6.7.3.3 KTB
a) Remove all bolting and taper pins holding upper
half of line bearing housing and remove it. Use
jack bolts and eyebolts for removal.
b) Remove top half sleeve bearing.
c) Carefully lift pump shaft just enough so that lower
half sleeve bearing can be removed.
d) Unbolt and remove lower half of line bearing
housing.
e) Remove inboard and outboard labyrinth rings.
Unscrew set screws and remove inboard and
outboard oil shields.
6.7.4 Rotor disassembly
a) Remove nuts holding seal plates to stuffing box
at inboard and outboard pump end.
b) Clean shaft and carefully withdraw complete seal
cartridges from the shaft.
c) Unbolt and remove outboard stuffing box. Use
jack screws provided for the initial start of
removal. Support stuffing box using an eye bolt
and lifting gear, and remove from the casing
ensuring that it does not swing down and
damage the shaft.
d) Remove stuffing box gaskets.
e) The rotating element may now be withdrawn. It is
essential that this operation is carried out as
carefully as possible to avoid damage to the shaft
and wear rings.
f) Unscrew 2
nd
impeller locking nut using a pin
spanner wrench. Remove the nut.
g) Clean shaft and carefully withdraw 2nd stage
impeller.
If the impeller should grip the shaft
before it is above the fit, do not attempt to force it
the rest of the way, but instead allow the
assembly to cool to room temperature and then
reheat the impeller until it is free.
h) Remove impeller key and central shaft sleeve.
6.8 Examination of parts
Used parts must be inspected before
assembly to ensure the pump will subsequently run
properly.
In particular, fault diagnosis is essential to enhance
pump and plant reliability.
6.8.1 Casing and Covers
a) Inspect for excessive wear, pitting, corrosion,
erosion or damage and any sealing surface
irregularities. Remove all scale and deposit in
stuffing box water jackets by scraping and
chemical treatment where necessary. New
casing gasket should be installed whenever the
pump is disassembled.
b) Replace as necessary.
6.8.2 Impeller
a) Remove worn impeller rings by mechanical
turning.
b) Slightly eroded parts can be repaired by welding.
Dynamically balance impellers after any machine
work. To balance remove metal from the front or
back shroud of the impeller at the point of
unbalance.