Flowserve BP - Manual (Page 31)

BP USER INSTRUCTIONS ENGLISH 85392725 10-09 (E)
Page 31 of 44 flowserve.com
After repairing the trust shoes and/or the
thrust collar, total end play of the thrust bearing will
be changed. If the increase of total shim thickness is
1.2 mm (0.05 in) or greater than the original shim
stack, the thrust collar and/or thrust shoes have to be
replaced.
6.8.9 Journal Bearings [3020]
Check the mating surfaces of the journal bearing if
they have any grooves, wear or melting. Wear,
grooves or scratches can not be repaired even if they
are minor because change in the surface profile will
deteriorate to produce hydro-dynamic bearing forces.
Worn out bearings have to be replaced with new
ones. Also check the running clearance.
Journal bearings are to be replaced if their
running clearances become 0.1 mm (0.004 in) larger
than the original.
6.9 Replacement of pressed in
components
6.9.1 Stage piece ring [1500], Diffuser ring
[1610], Throat bushing [4132] and
Balancing ring [1600]
a) As these rings are pressed into position, they are
pulled off with a special tool or cut out by
machining.
b) New rings are pressed into or are inserted in the
bore of the diffuser, stage piece or discharge
head after they are cooled. A knock pin is
pressed into a hole drilled at the fitting and the
head of the pin is crimped with a punch
6.9.2 Impeller
wearing [2300]
a) As a wearing ring is inserted onto the hub of an
impeller by a shrink fit and fixed with setscrews, it
is cut out by breaking up the ring.
b) After heating a new impeller ring, it is mounted on
the impeller, then thread the set screw at the
fitting between the impeller ring and impeller hub
6.9.3 Oil baffles [4330]
a) As an oil baffle is pressed into, remove it with a
hammer
b) Press an oil baffle to locate a drain hole at the
bottom of the bearing cover into the bore of a
bearing cover by using a hammer.
6.10 Assembly
For location of parts, see section 8 drawing and parts
list. For application of tools refer to “Tool List” and
explanatory diagram. To assemble the pump reverse
the dismantling procedure previously described.
All gaskets should be replaced with new items having
the same thickness and material. Apply lubricant to
“O” rings.
At the factory, impellers and balancing drum of each
pump are given an individual dynamic balance. Then
the entire rotor, consisting of shaft, impellers, split
rings [2531.1-2], balancing drum [6230], thrust ring
[2531.3], shaft sleeves of mechanical seal, keys and
coupling nut, is assembled and dynamically balanced
as a unit. Always consider the effect on dynamic
balance when replacing or repairing rotor parts.
When deflectors [2540] and shaft sleeves of
mechanical seals are held on the shaft with set
screws, after tightening set screws firmly, punch the
set screw at two or three spots.
6.10.1 Building of Inner Element. (Rotor, Inner
Casing)
Building the inner element-should be done with the
shaft vertical.
Loose fit impeller
a) Insert the split ring [2531.1] for the 1st stage
impeller [2200.1] into the circumferential groove
in the shaft. Slide the 1st stage impeller along the
shaft with key [6700] against the spilt ring
[2531.1]. Then install the spirolox ring [6544] into
the circumferential groove in the shaft using the
sleeve (Tool List No. 22) in order to hold the
impeller in place. In installing the spirolox ring, lay
it on the sleeve (Tool List No. 22) and slide down
the sleeve with it on along the shaft until it is
home against the impeller back hub.
Shrink fit impeller
c) Insert the split ring [2531.1] for the 1st stage
impeller [2200.1] into the circumferential groove
in the shaft. Heat the impeller in an electric
furnace and slide the 1st stage impeller along the
shaft with key [6700] against the spilt ring
[2531.1]. For shrunk fit impellers, apply heat on
the impeller hub and quickly slide it onto the shaft
at the appropriate position
d) Support the suction stage piece [1460]
horizontally on a proper supporting stand.
e) Lower the shaft with the 1st stage impeller into
position of the suction stage piece [1460].
Support the weight of the shaft with blocks under
the bottom end so that it does not pull away from
the impeller.
f) Insert the first diffuser [1411] with diffuser ring
[1610], into the stage piece [1460]. In lowering
the diffuser, use lifting jig (Tool List No.12).