Flowserve HWX Worthington - Manual (Page 25)

HWX USER INSTRUCTIONS ENGLISH - 07/14
Page 25 of 40
6.6 Disassembly
Refer to section 1.6, Safety, 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.
Before attempting to disassemble the pump,
the pump must be isolated from the system, by
closing suction and discharge system valves,
drained of liquid and cooled, if pump is handling
hot liquid.
Before attempting any maintenance work on
pumps in vacuum service, the pumps must be
isolated from suction and discharge system then
carefully vented to return pressure in pump
casing to atmospheric pressure.
Remove the pipe plug(s) from the
top of the bearing housing(s) and check to see
that oil rings are riding free on the pump shaft
and are not hung up. Failure to observe this
caution could result in damage to or destruction
of equipment.
6.6.1 Pull Out Element Removal
This pump has a pull-out element, which consists of
the pump shaft [2100], mechanical seal assembly,
casing cover [1221], impeller [2200], and bearing
housing assembly, as well as their attached parts.
This pull-out element makes it unnecessary to
remove the driver, bearing lantern [3140], or casing
[1110] to service the bearing housing assembly,
mechanical seal, impeller [2200], wear rings
[2300.1/2300.2–1500.1/1500.2], stuffing box bushing
[2430], and gaskets.
For an illustrative part reference, see the Pump
Assembly drawing in the back of this manual.
a) Remove all seal piping, related instrumentation
and electrical equipment that will interfere with
disassembly. Drain pump casing.
When pump is handling "hot" liquid extreme
care must be taken to ensure safety of personnel
when attempting to drain pump. Hot pumps must
be allowed to cool before draining.
When pump is handling "caustic" liquid
extreme care must be taken to ensure safety of
personnel when removing auxiliary piping or
when draining pump. Protective devices of
suitable protective materials must be worn when
draining the pump.
b) Remove coupling guard [7450] from bearing
lantern [3140] by removing bolts and washers.
c) Disassemble and remove coupling spacer in
accordance with the manufacturer’s instructions
in the back of this manual.
d) In case of Oil Lubrication drain the bearing
housing of oil. This can be done by removing the
drain plug situated at the bottom of the bearing
housing.
Use caution when draining hot oil from
bearing housing to prevent burns/injury to
personnel
e) Remove the hex bolts clamping the casing cover
[1221] to the casing [1110].
f) Use the jacking bolts provided on the casing
cover [1221] flange to lift the cover from the
casing [1110] and raise the cover above the
lower flange of the bearing lantern [3140].
g) Attach the pullout element lifting tool to the
pullout element, then lift the element out of the
casing [1110]. (See figure 6.2).
Figure 6.2
The lifting tool is not part of the pump. It
must be ordered separately.
h) Raise the pullout element upward until the
impeller clears the lower flange of the bearing
lantern [3140] and remove through the large
opening.
i) Remove the casing cover gasket [4590] from the
casing [1110] or casing cover [1221] and discard.
j) Move the pullout element to a safe, clean work
area for further disassembly.
6.6.2 Pull Out Element Disassembly
All gaskets and O-rings removed
during maintenance are to be discarded and
replaced with new ones to ensure proper sealing
during subsequent operation.