Flowserve BP - Manual (Page 34)

BP USER INSTRUCTIONS ENGLISH 85392725 10-09 (E)
Page 34 of 44 flowserve.com
6.10.6 Assembling Suction End (Coupling End)
a) Insert the spiral wound gasket [4590] on the
gasket seat face in the casing barrel [1100].
b) Install the suction head [1222] with the throat
bushing [4132] into the casing barrel [1100].
c) Install carefully the mechanical seal with the shaft
sleeve into the suction head bore [1222]
according to the instruction manual for
mechanical seal. At this stage, mechanical seal
must not be secured on the shaft by set screws
nor secured in the suction head by tightening the
nuts for gland studs.
6.10.7 Assemble Radial Bearing
a) Insert and slide the deflector [2540] on the shaft
until they get closer to the mechanical seal.
b) Install lower half of radial bearing housing [3200]
to the suction head [1222] with taper pins and the
studs, nuts for studs have to be temporarily
fastened.
c) Install both horizontal and vertical adjusting
screws in the mounting flange of suction head.
d) Wipe a film of oil on journal area of shaft. Place
lower half of journal bearing [3020] on shaft.
Wipe a film of oil on lower half of journal bearing.
Roll lower half of journal bearing into lower half of
bearing housing [3200]. Now the bearing housing
is temporarily positioned to the suction head.
e) Pour a small amount of oil on journal bearing and
journal area of shaft.
Bearing housings position is pre-determined
at the factory and secured by taper pins, but the
positioning of the bearing housings by these pins has
to be confined only at the repair of mechanical seals.
At the complete overhaul of the pump, positioning of
the bearing housings has to be conducted without
these pins, but by positioning of pump rotor by the
manner described on section 6.9.7. Horizontal /
Vertical Shaft Alignment.
6.10.8 Horizontal / Vertical Shaft Alignment
a) It is mandatory necessary to check and record
the vertical lift of the rotor within the casing.
b) Place a dial indicator on the horizontal split face
of the lower radial bearing housing [3200] with
the indicator tip resting on the top of the shaft
about 80 mm (3 in) inside toward the mechanical
seal from the centre of the radial journal bearing.
c) Remove the radial side journal bearing. Zero the
indicator. Using a bar and a block of wood under
the shaft, lift the shaft and record the movement.
Both vertical and horizontal movement has to be
measured and recorded.
d) Take measurements at the thrust end of the
pump with the same manner. To do this, place
the lower half of radial side journal bearing at its
place and remove the thrust side journal bearing.
e) Designed minimum vertical movement of the
shaft for this pump is shown as vertical end play
at the radial side and the thrust side.
See “Important Clearances and Movement Table”
in section 10.4 Technical Data Sheet. Smaller
running clearance at the balancing drum makes
the movement smaller at the thrust end. If this
minimum movement is not obtained, the cause
must be investigated and corrected.
f) Make the bearing housings of both radial and
thrust sides to position at the centre of these
movements for both vertical and horizontal
directions. This can be done by removing the
taper pins, if the housings are not in correct
position, and by adjusting screws furnished on
the mounting flanges of suction head and stuffing
box.
g) Repeat step a) to e) to obtain the condition of
step f).
h) Horizontal position is now determined. Vertical
position has to be re-adjusted to lift the shaft
again by adjusting value to lift the rotor (from the
centre of vertical end play) at the radial side and t
the thrust side.
See “Important Clearances and Movement Table”
in section 10.4 Technical Data Sheet.
i) This re-adjustment is required to compensate the
deflection of the shaft in the pump and to obtain
the most desired position of the rotor in the
casing barrel. Check and rotate the shaft 2 to 3
times that it will rotate freely without any
obstruction.
j) When vertical and horizontal alignment is
obtained, tighten bearing housing bolting. Re-
ream dowel holes and install taper pins.
k) Fasten the thrust bearing housing [3230] to the
stuffing box [4112] with the studs and nuts.
l) Fasten the radial (line) bearing housing [3200] to
the suction head [1222] with studs and nuts.
m) Set the deflectors on the inner and outer side
[2540] 1 mm (0.04 in) apart from the side face of
the oil baffle [4330] respectively, and fix them
with setscrews to the shaft. (Fig.6-1)
Deflector