Flowserve CPXV fitted with Mark 3 ASME hydraulics - Manual (Page 30)

CPXV with Mark 3 ASME hydraulics ENGLISH 71569291 12-14
Page 30 of 44
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e) Any long length of shaft should be temporarily
supported to avoid bending or damage whilst
removing the muff coupling(s).
6.9.4 Bearings, seals and upper shaft
a) If a seal is fitted in the sole plate, determine its type
and remove the seal cover screws and any
accessible seal to shaft clamp screws as appropriate.
b) Remove the bearing housing screws.
c) Drive out the labyrinth disk from the sole plate
(if fitted).
d) Pull the bearing housing and upper shaft assembly
out of the sole plate. Take care to support the long
shaft to avoid bending or damage to it and any
attached components.
e) Pull off the coupling and remove the coupling key.
f) Unscrew the bearing outer nut (left hand thread).
g) Remove the drive side flinger and or labyrinth seal
(if fitted) from the shaft.
h) Slide the bearing carrier off of the bearing(s).
i) Remove the bearing nut.
j) Pull off the bearing(s).
k) Loosen any remaining seal to shaft clamp screws
and slide the seal(s) and seal covers off the shaft.
Any bearings or sleeves can then be pressed out/off
as required after first removing any retaining screws.
6.10 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.
6.10.1 Casing, seal housing and impeller
Inspect for excessive wear, pitting, corrosion, erosion
or damage and any sealing surface irregularities.
Replace as necessary.
6.10.2 Shaft and sleeve (if fitted)
Obtain and fit a new shaft or sleeve if grooved, pitted
or worn.
6.10.4 Gaskets and O-rings
After dismantling, discard and replace.
6.10.5 Bearings
It is recommended that bearings are not re-used after
any removal from the shaft.
The plain bearings may be re-used if both the bearing
bush and bearing sleeve show no sign of wear, grooving
or corrosion attack. It is recommended that both the
bush and sleeve are replaced at the same time.
6.11 Assembly
To assemble the pump consult the sectional
drawings. See section 8, Parts lists and drawings.
Ensure threads, gasket and O-ring mating faces are
clean. Apply thread sealant to non-face sealing pipe
thread fittings.
6.11.1 Mechanical seal or gland packing seal
(If there is no mechanical seal or gland packing at the
sole plate, go to section 6.11.2, Thrust bearing carrier
and shaft sub-assembly.)
Where a mechanical seal is used, extreme cleanliness
is required during assembly. In many instances a pre-
assembled cartridge seal will be used. Where this is not
the case the sealing faces must be checked to be free
from scratches or other damage.
a)
Use olive oil for fitting elastomers.
b) Where an anti-rotation pin is fitted ensure that
correct engagement with the slot is achieved.
c) Carefully press stationary mechanical seal seat(s)
into their housing such that these are not deformed
or damaged.
Work to the specific manufacturer’s
instructions for the mechanical seal.
Where a packed stuffing box [4110] is fitted, pack the
stuffing box cover before fitting on to the shaft, as
follows:
a)
Position each ring [4130] into the box individually,
evenly and firmly.
b) Check that the shaft sleeve [2400.2] freely
rotates after fitting the first ring.
c) Stagger the 45 degree scarf joints by 90 degrees
from each other in the box.
d) Insert the inner two packing rings.
e) Insert lantern ring [4134] halves (if required).
f) Insert the remaining packing rings.
g) Position the gland [4120] squarely against the
last ring, tighten the gland nuts finger-tight only
and install on to bearing housing assembly.
Jacketed sump pumps are fitted with a
gland packing seal at the sole plate.
6.11.2 Thrust bearing carrier and shaft sub-
assembly
a)
Clean the inside of the bearing carrier and bores
for the bearings.
b) On grease lubricated bearings fill the bearing
carrier retaining ring [2530.1] internal slot with the
appropriate grease. The three thin grease rings
may now be inserted into this internal slot.