Xylem LCP - Manual (Page 21)

Installation, Operating and Maintenance Instruction Model LS, LC, LCP
LS 100-english page 19 Revision 02
Artikel No. 771073402 Issue 01/2010
8.7.1 Clearance at impeller
Suction side of impeller
Drive side of impeller
Pump
size
Suction side Drive side
D *)
(mm)
Radial clearance
s (mm) D *)
(mm)
Radial clearance
s (mm)
new wear
limit
new wear
limit min. max. min. max.
125-330 200
0,20
(0,45)
0,24
(0,50)
1,15
(1,40)
200
0,20
(0,45)
0,24
(0,50)
1,15
(1,40)
125-500 220
0,20
(0,45)
0,24
(0,50)
1,15
(1,40)
250
0,20
(0,50)
0,24
(0,55)
1,20
(1,50)
150-500 250
0,20
(0,45)
0,24
(0,50)
1,20
(1,45)
250
0,20
(0,50)
0,24
(0,55)
1,20
(1,50)
200-260 220
0,23
(0,50)
0,28
(0,55)
1,15
(1,45)
220
0,23
(0,50)
0,28
(0,55)
1,15
(1,45)
200-350 250
0,23
(0,75)
0,28
(0,80)
1,20
(1,75)
250
0,23
(0,75)
0,28
(0,80)
1,20
(1,75)
200-400 270
0,23
(0,60)
0,28
(0,65)
1,25
(1,65)
270
0,23
(0,60)
0,28
(0,65)
1,25
(1,65)
200-500 250
0,23
(0,50)
0,28
(0,55)
1,20
(1,50)
250
0,23
(0,50)
0,28
(0,55)
1,20
(1,50)
250-315 250
0,23
(0,75)
0,28
(0,80)
1,20
(1,75)
250
0,23
(0,75)
0,28
(0,80)
1,20
(1,75)
250-350 270
0,23
(0,60)
0,28
(0,65)
1,25
(1,65)
270
0,23
(0,60)
0,28
(0,65)
1,25
(1,65)
250-400 280
0,23
(0,75)
0,28
(0,80)
1,25
(1,80)
280
0,23
(0,75)
0,28
(0,80)
1,25
(1,80)
250-500 280
0,23
(0,70)
0,28
(0,75)
1,25
(1,75)
280
0,23
(0,70)
0,28
(0,75)
1,25
(1,75)
300-400 315
0,23
(0,68)
0,28
(0,73)
1,33
(1,80)
315
0,23
(0,68)
0,28
(0,73)
1,33
(1,80)
300-450 315
0,23
(0,68)
0,28
(0,73)
1,33
(1,80)
315
0,23
(0,68)
0,28
(0,73)
1,33
(1,80)
300-500 330
0,23
(1,00)
0,28
(1,05)
1,40
(2,20)
330
0,23
(0,70)
0,28
(0,75)
1,40
(1,90)
350-450 380
0,25
(0,68)
0,29
(0,73)
1,45
(1,90)
350
0,25
(0,68)
0,29
(0,73)
1,45
(1,90)
400-400 370
0,25
(0,65)
0,29
(0,75)
1,45
(1,90)
250
0,20
(0,45)
0,24
(0,50)
1,45
(1,70)
600-600 515
0,25
(0,65)
0,30
(0,75)
1,60
(2,05)
515
0,25
(0,65)
0,30
(0,75)
1,60
(2,05)
Values in parenthesis are valid for code VV and WW.
*) nominal diameter
When the wear limits has been reached or
exceeded, the worn parts must be replaced.
There are the following possibilities to restore the
correct clearances:
a) Renew impeller(1) and wear rings (9/S und 9/D).
Then the original measures are restored.
b) A customized wear ring (bored to fit) can be
supplied to avoid replacement of the impeller.
Please contact factory for details.
8.8 Mounting
Re-assemble the pumps using the reverse order of
steps as completed for pump disassembly. However
the following observations should be considered:
Pay attention to the utmost cleanliness when
reassembling the pump.
For tight tolerances, e.g. between shaft sleeve
(44) and shaft (24) or impeller (1) and shaft (24),
as well as thread, use a suitable anti-galling
compound (e.g. Molykote/Never-Seeze), so that
the assembly and the next disassembly will be
easier.
Anti-galling compound must be compatible with
the pumpage.
Screws should be tightened, with the following
torque:
Location
Screw
Size
Screw torque in Nm
Lubricated
thread
Dry thread
Casing screws
M16 75 110
M20 165 (255) 255 (385)
M24 325 (440) 495 (665)
M30 575 870
All other screws
M12 40 60
M16 100 150
M20 190 290
M24 330 500
Values in parenthesis are valid for:
- size M20 for pump size LS 400-400 and model LC & LCP
- size M24 for pump size LS 608-600 and LS 606-600
It is only allowed to use the prescribed bearings
according chapter 3.3.1.
It is only allowed to mount a pair of angular
bearings from one manufacturer.
Heat the angular contact bearings (K2) and the
inner ring of the roller bearing (K1) in an oil bath or
inductive up to 80 C, slide the bearings until the
contact surface on the shaft (24) and press it as
long as it fits tightly on the shaft.
The angular contact bearings (K2) must be
mounted in X-arrangement resp. in O-
arrangement at bearing bracket 100S.
Don the lock washer (SB) and fasten the bearing
nut (50) with a hook wrench.
Cool down to ambient temperature the angular
contact bearings.
Refasten the bearing nut (50) and bend the lock
washer (SB) of the bearing nut.
Pay attention at the mounting of the shaft (24),
with assembled angular contact bearings (K2) and
inner ring of the roller bearing (K1) into the bearing
bracket (10) that the running surface of the roller
bearing does not get damaged by the edges of the
rolls.
At the assemble pay attention of the bearing
bracket (10) with the lantern (11) and from the
lantern (11) with the volute casing (4) that the
screws are positioned in the centre of the
clearance holes.
Otherwise the bearing bracket (10) tilts against the
volute casing (4) and then exact adjustment of the
oil level is affected.
For mounting of the shaft sealing (packing or
mechanical sealing) see separate description
"Mounting Instruction of Shaft Sealing" and
chapter 8.5.