Xylem LN - Manual (Page 55)

Installation, Operating and Maintenance Instruction Model L, LN
Page 51
5.3 Coupling
Make sure that nobody can start the motor
during work on the coupling.
According to Accident Prevention Regulations,
the pump unit may only be operated when the
coupling guard is mounted.
5.3.1 Installation of Coupling
If the pump unit is not completely assembled until it
reaches its place of use and no separate operating
instructions have been supplied by the manufacturer,
you should proceed according to the following points:
 Before starting installation, carefully clean shaft
ends and coupling components.
 Pull coupling onto shaft end, do not hit. The
coupling may be heated beforehand in an oil bath
to approx. 100°C (pulling on is then easier).
Remove rubber packs from coupling section first.
 The coupling sections must be flush with the shaft
end surfaces.
 Secure coupling hubs against axial sliding using a
pin screw.
5.3.2 Alignment of coupling
The alignment of the coupling must be carried
out with the utmost care and attention, so that
the unit will operate without failure. If you do not
pay attention to this hint you will lose your
warranty!
After mounting onto the foundation and the
connection of the piping the coupling must be
adjusted again, even, if the unit was delivered
completely mounted on the frame.
 Before adjusting the coupling unfasten screws
(S7) between bearing bracket (10) and casing foot
(80/F) and only fasten again after the adjustment.
Repeat measurement after fastening of screws
(S7).
 The unit is properly aligned, when a ruler, which is
laid axially over both coupling halves, has the
same distance to the particular shaft everywhere
on the circumference. Further, both coupling
halves must have the same distance to one
another on every of the circumference. This must
be checked by means of a tracer, gauge or dial
gage; refer to pic. 4 and 5.
 The permitted tolerances for your coupling are
shown in chapter 5.3.3 "Permitted displacement
for flexible couplings". For the exact
characterization of your coupling refer to data
sheet and / or order confirmation.
pic 4 - Alignment of coupling with gauge and ruler
pic 5 - Alignment of coupling with spacer
Control alignment of coupling again in operation
warm condition and on system pressure (if
available) and correct, if necessary. Pay
attention to chapter 6 beforehand! It must be
possible to turn the unit easily and harmoniously
by hand.
Improper alignment of the unit can lead to
damages at coupling and unit!
Mount coupling guard after alignment and
before start-up.
5.3.3 Permitted displacement for flexible couplings
Coupling size
H80FK H95FK H110FK B
125K
F
H125FK B
140FK
H140FK B
160FK
H160FK B
180FK
H180FK B
200FK
H200FK
Outer diameter of coupling
[mm]
80 95 110 125 140 160 180 200
Axial distance S
S
max
3 6
S
min
2
Max. radial displacement
K
r
0,1 0,2
Max. angular displacement
S
max
. S
min
K
w
= S
max
- S
min
0,1 0,2
ruler
ruler
gauge
gauge