Flowserve WPG IDP - Manual (Page 21)

WPG and WPH USER INSTRUCTIONS ENGLISH 26999969 10-12
Page 21 of 40
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6.7 Disassembly
Refer to Safety section 1.6 before dismantling
the pump.
Before dismantling the pump for
overhaul, ensure genuine Flowserve replacement
parts are available. Refer to sectional drawings for
part numbers and identification. (See section 8, Parts
lists and drawings.)
6.7.1 Dismantling bearing housing assembly
To remove proceed as follows:
a)
Disconnect all auxiliary pipes and tubes where
applicable.
b) Remove coupling guard and disconnect coupling.
c) If oil lubricated frame, drain oil by removing drain
plug.
d) Pull off the pump half of coupling and remove
coupling key.
e) Remove support foot. Fit a screw into the tapped
hole in the frame to act as support. (NB: On larger
units leave the support foot in place.)
f) Remove the nuts which secure the integral frame
or bearing housing/adaptor to the pump casing.
g) Remove the rotating element complete with
bearing frame or bearing housing as one complete
unit for further dismantling.
h) Prise open the impeller locknut washer and
remove impeller nut (right hand thread). If an inlet
inducer is fitted then this should be removed first
(right hand thread).
i) Pull off the impeller.
j) On units fitted with gland packing, remove the
gland nuts and remove the gland from the studs.
Unscrew the stuffing box cover/bearing bracket
bolts (where fitted) and remove the stuffing box
cover.
k) Remove gland packing, lantern ring and packing
seating ring.
l) Remove shaft sleeve (if fitted).
m) On units fitted with mechanical seals, the
manufacturer's instructions should be followed
when dismantling and assembling. For standard
mechanical seals the following procedures give
general guidance.
n) Remove the nuts securing the seal plate to the
casing backplate seal housing and slide the seal
plate away.
o) Unscrew the stuffing box cover/bearing adaptor
bolts (where fitted) and remove the stuffing box
cover. The inboard seat on a double seal will
come away with the stuffing box cover.
p) Mark the position of the seal drive collar on the
shaft (or sleeve if fitted). Loosen the drive screws
in the seal drive collar and remove the rotating
element of the seals from the shaft or sleeve. For
double seals, smooth any marks on the shaft or
sleeve made by the inboard seal before removing
the outboard seal.
q) Remove stationary seat(s) from the seal plate
and seal housing. This should only be necessary
if the stationary face or its seating ring are being
replaced.
r) Remove shaft sleeve (if fitted).
6.7.2 Dismantling bearing frame
This operation should only be necessary if the
bearings are to be replaced.
a)
Pull off the pump half coupling and remove
coupling key. Remove liquid thrower and both
bearing covers noting that metal labyrinth throwers
are secured by M 4 socket head setscrews.
b) Press shaft, complete with bearings, out of bearing
housing towards coupling end. On oil lubricated
units the outer race and roller of the pump end
bearing will stay in the housing. These should
now be removed.
c) Remove bearing locknut (and lockwasher where
fitted) and drive off bearings.
6.7.3 Renewable rings
a)
When fitted, these should only be removed from
the casing and stuffing box cover when they need
to be replaced.
b) They should be prised out from behind using
levers, or alternatively, carefully drilled followed by
chiselling to split the ring to facilitate removal.
c) Replacement rings should be pressed into position
ensuring they are square within the recess.
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, seal housing and impeller
Inspect for excessive wear, pitting, corrosion, erosion or
damage and any sealing surface irregularities. Replace
as necessary.
6.8.2 Shaft and sleeve (if fitted)
Replace if grooved, pitted or worn.
6.8.3 Gaskets and O-rings
After dismantling, discard and replace.
6.8.4 Bearings
It is recommended that bearings are not re-used after
any removal from the shaft.