Flowserve PVML - Manual (Page 20)

PVML USER INSTRUCTIONS ENGLISH 00079591 – 01/05
®
6.5 Fastener torques
Torque Nm (lb ft)
Application
Lubricated Not lubricated
Casing studs
M 12
M 16
M 20
M 24
M 30 55 (41)
110 (81)
170 (126)
247 (182)
519 (383)
65 (48)
165 (122)
285 (211)
375 (277)
540 (399)
Seal studs, all cases
(back mounted seal) 125 145
Seal bolts
(front mounted seal)
M10
M12 25 (18)
34 (25) 30 (22)
40 (30)
Packed gland studs Finger tight Finger tight
Impeller screw
M8
M12
M16
M20
M24
6 (4.5)
23 (17)
57 (42)
114 (84)
180 (133)
7 (5.2)
25 (18)
60 (44)
120 (89)
190 (140)
6.6 Setting impeller clearance
As wear takes place between the impeller and casing
ring the overall efficiency of the pump set will
decrease. To maintain optimum efficiency it is
recommended that rings are replaced and the impeller
renovated when the diametral clearance detailed in
section 3.4.2 has doubled to 0.7 to 1.1 mm (0.028 to
0.043 in.), depending on pump size and wearing ring
diameter.
6.7 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.
6.7.1 Removing the 'back pull out' unit
The 'back pull out' unit is removed by following the
procedure given below:
remove the nuts [6581.1] from the casing cover.
attach the lifting devices to the appropriate lifting
points, see Figure 1. Observe the lifting
instructions described in section 2.3.
lift the casing cover up. Work carefully as there is
not much clearance between the diffuser and the
pump casing.
remove the packing ring [4590.2] from the pump
casing and dispose of this in the proper way.
This type of packing may only
be used once.
6.7.2 Removing the diffuser
This procedure describes removal of the diffuser
from the casing cover.
Bend open the lock washers [6541] and
remove the hexagon head bolts [6577.1] from
the diffuser.
Remove the diffuser.
6.7.2 Removing the impeller
This procedure describes removal of the impeller
from the shaft of the electric motor.
fix the shaft sleeve of the mechanical seal in
place using the face plates on top of the cover
of the mechanical seal.
undo the impeller screw [2913] with left-hand
thread. The impeller screw is locked in the bore
hole in the impeller by twisting the impeller
screw.
remove the impeller screw and the packing ring
[4590.4] between impeller and impeller screw.
This type of packing may only be used
once. Dispose of the packing ring in the proper
way.
push the impeller from the shaft of the electric
motor and remove the released key [6700].
remove packing ring [4590.3] between the
impeller and the shaft sleeve of the mechanical
seal.
This type of packing may only
be used once. Dispose of the packing ring in
the proper way.
6.7.3
Removing the motor stool
With a 'back mounted' construction, the mechanical
seal is mounted on the top of the casing cover
which means that the motor stool has to be
detached from the casing cover before
disassembling the mechanical seal.
Place the bottom of the casing cover on a flat
surface.
Remove the bolts [6577.2].
Lift the motor stool up vertically. Work carefully
as long as the shaft of the electric motor is still
inserted in the shaft sleeve.
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