Flowserve DMX - Manual (Page 42)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09
Page 42 of 60
properly located in the slot on the lower half
casing parting flange.
b) Install main parting flange gasket [4590]. Refer to
parting flange gasket.
c) Place lower half of the center bushing [1600] into
the lower half casing [1210], making sure the
anti-rotation pins are properly located in the slot
on the lower half casing parting flange.
In case of double suction pump (DMXD and
DMXDH), place lower half of the crossover bushing
[1600] into the lower half casing [1210], making sure
the anti-rotation pins are properly located in the slot
on the lower half casing parting flange.
d) Place the lower half of all channel rings [1500] in
lower half casing, in the same sequence as they
were removed, making sure the anti-rotation pins
are properly located in the slot on the lower half
casing parting flange.
Channel rings are precision machined as a
set, after being dowelled. Be sure they are
reassembled as a set.
e) Place casing rings [1500], throttle bushing [1630]
and seal chamber bushings [4132] in their proper
positions on pump rotor.
f) Rig rotor [2000] to an overhead hoist. Refer to
lifting equipment section of this manual.
g) Position rotor over lower half casing and position
bushings and casing rings such that the anti-
rotation pins are facing in the up position such
that they can be easily rotated in the slot on the
lower half casing parting flange.
All anti-rotation pins must be located
in the slot on the lower half casing parting flange.
Failure to do so could cause the pins to be bent or
crushed.
h) Lower rotor into casing slowly, making sure it is
seated properly.
i)
After the rotor is in pump, rotate the rings and
bushings on the rotor so that the anti-rotation
pins are properly located in the slot on the lower
half casing parting flange.
j) Install the upper half of center bushing [1600] and
seat taper dowel pins [6810]. Install cap-screws
[6570] and tighten.
In case of double suction pump (DMXD and
DMXDH), Install the upper half of crossover bushing
[1600] and seat taper dowel pins [6810].
k) Install upper half of channel rings [1500] and seat
shoulder screws or dowel pins.
l) Check rotor axial float as described in 6.8.8.
m) Rig upper half casing [1210] to an overhead
hoist. Refer to lifting equipment section.
n) Position upper half casing over lowers half and
lower carefully, making sure all rings and
bushings enter their proper fit.
o) Install main parting flange dowel pins [6810] and
seat.
p) Check rotor axial float and vertical lift as
described in 6.8.8 and 6.8.7.
q) Install main parting flange washers [2905] and
nuts [6580] and torque to the recommended
value.
Make sure parting flange jack-screws
[6570], in lower half casing, are backed out far
enough so as not to protrude above parting flange
machined surface.
6.8.7
Check rotor vertical lift
It is necessary to check and record the vertical lift of
the rotor within the casing.
a) Place a dial indicator on the upper half casing
with the indicator tip resting on the top of the
shaft. Zero the indicator.
b) Using a bar and a block of wood under the shaft,
lift the shaft and record the movement. Take
measurements at both ends of the pump.
c) The minimum acceptable vertical movement is
the minimum back ring clearance on the suction
end of the pump and the minimum throttling
bushing clearance on the discharge end of the
pump. For clearances, refer to the sectional
drawings included in section 8 of this manual.