Xylem LSNIH - Manual (Page 17)

Installation, Operating and Maintenance Instruction Model LSN
LSN 100-english page 15 Revision 01
Article No 771076024 Issue 01/2010
If the liquid being handled leaks out at the mechanical
seal, it is damaged and must be replaced.
Replacement of the mech. seal according to
accompanying "Mounting Instructions for Shaft
sealing".
7.3 Stuffing boxes
Stuffing boxes require constant maintenance, see
chapter 6.2 section "Stuffing box". If the leakage rate
can no longer be set correctly, the packing is worn out
and must be replaced in good time (increased wear on
shaft sleeve). Replacement of stuffing boxes acc. to
attached "Mounting Instructions for Shaft Sealing".
Because of the risk of accidents, addition of
packing to pumps during operation or at
operating pressure or temperature is strictly
forbidden!
7.4 Lubrication and Change of Lubricant
7.4.1 Oil lubrication
Temperature at
bearing
First oil change
after .....
operating hours
All further oil
changes
after .....
operating hours
up to 60°C 300 8760 *)
60°C - 80°C 300 4000 *)
80°C - 100°C 200 3000 *)
*) at least 1x year
In plants endangered to explosion the oil
changeing intervals must be kept under any
circumstances!
Oil changing
After the first ....... operating hours, drain oil (oil
drain "GD" with drain plug 903.51) and flush with
fresh oil. Clean oil drain plug and close oil drain
again.
Fill in new oil according to chapter 6.5.
If the pump is left idle for a longer time, the oil
should be changed after two years.
Old oil must be disposed of in accordance with
the valid national environmental regulations.
Oil quality
Name
Lubricating oil
CLP46
DIN 51517 or
HD 20W/20 SAE
Symbol acc. DIN 51502
Kinematic viscosity at 40°C
Flash point (acc. to Cleveland)
Setting point (Pourpoint)
Application temperature *) 46 ±4 mm
2
/s
+175°C
-15°C
higher than
permitted bearing
temperature
*) For ambient temperatures under -10°C an other suitable type of
lubrication oil must be used.
Request required.
Oil quantity
Bearing bracket Oil quantity in l
24 0,5
32 1,1
42 1,4
48 1,7
7.4.2 Grease lubrication
Re-greasing
Grease lubricated bearings with the possibility of
re-greasing must be re-lubricated all 4000
operating hours, but at least 1x year. Clean
lubricating nipples (636) first.
Quality of grease lubricant ...
... corresponding to NLGI GRADE 2
Quantity of re-greasing (approx. value)
Bearing bracket
bearing at pump
side
bearing at drive
side
24 9g / 10cm
3
14g / 16cm
3
32 13g / 15cm
3
20g / 22cm
3
42 18g / 20cm
3
33g / 35cm
3
48 23g / 26cm 3 42g / 46cm 3
If the pump is left non-operational for a longer
time, the grease in the bearings should be
changed after 2 years.
7.5 Coupling
Check the clearance in the coupling components
regularly approx. every 1000 operating hours, but at
least 1x year, the radial clearance in the coupling parts
must be checked.
For couplings with rubber pads the following applies:
Unless a clearance in the couplings is necessary, the
coupling pads may wear out to approximately ¼ of
their usual thickness, before they have to be changed.
To measure the clearance in the coupling place a
mark on the O.D. of each coupling hub (see following
pic). Then fixing one hub, turn the opposite hub as far
as possible. Then measure the distance (∆S
V
)
between the marks of the coupling. If this measure
exceeds the value given in the chart, the packings
must be replaced. They must be replaced in sets.
Size 80 95 110 125 140 160 180 200 225 250 280 315 350 400
∆ S
v
[mm] 5,0 6,0 7,0 8,0 8,5 8,0 8,0 8,5 9,0 10,0 11,5 10,5 11,5 13,0
If wear is heavy, it must be assumed that the
motor is not properly aligned with the pump or
that the distance between the coupling sections
has changed. Replace worn elements and re-
install or adjust coupling, as described in
chapter 5.3.