Xylem LSNIH - Manual (Page 18)

Installation, Operating and Maintenance Instruction Model LSN
LSN 100-english page 16 Revision 01
Article No 771076024 Issue 01/2010
7.6 Cleaning of pump
The pump must not be cleaned with pressurised
water - water will get into the bearings.
Dirt on the outside of the pump has an adverse
effect on transmission of heat. The pump should
therefore be cleaned with water at regular
intervals (depending on the degree of dirt).
Radial-Shaft sealings (421.41 and 421.51) are not
completely free from leakage. Impurities could
cause leakage at the shaft sealing area of the
frame. Therefore wipe off impurities with a rag
from time to time.
Replace dirty oil level sight glass (642).
8. Dismantling and repair of pump
8.1 General remarks
Repair to the pump or pump system may only
be carried out by authorised skilled personnel or
by the manufacturer´s specialist staff.
When disassembling the pump pay attention to
chapter 2 and chapter 4.1.
For mounting and repair you can order specialized
personnel if you want.
If dangerous liquids are pumped the appropriate
disposal of the handled liquid is necessary
before the disassembly of the pump. Pay
attention to the fact, that even in drained pumps
there are remainders of the handled liquid. If
necessary the pump must be flushed or
decontaminated. Laws must be observed,
otherwise danger to health is existing!
Before the disassembly the pump has to be
secured in such a way, that it can´t be started.
The pump casing must be drained and without
pressure.
All locking devices in the suction- and discharge-
pipe must be closed.
All parts must have taken on the temperature of
the environment.
Secure disassembled pumps, units or single
parts against tipping over or rolling off.
While disassembling the pump use of an open
flame (blowlamp, etc.) only, when there is no
danger of setting fire, cause an explosion or
cause injurious vapours.
Never apply heat to remove the impeller nut.
Use of heat may result in severe physical injury
and property damage.
Use original spare parts only. Pay attention to
the right materials and the matching design.
8.2 General
Works, which require shocks (hammer), must
only be performed outside the explosive
atmosphere or only non-sparking tools must be
used.
Carry out disassembly and mounting according to the
appropriate sectional drawing.
You will only need common tools.
Before disassembly check if required parts are ready.
Disassemble the pump only so far, as required for the
replacement of the repair part.
8.3 Disassembly of Back Pull Out
Assembly
The Back Pull Out Assembly includes all parts of the
pump except the volute casing (102V). As the pumps
are constructed for process design the volute casing
(102V) can stay on the base frame and in the pipes,
unless the volute casing itself must be repaired.
Drain volute casing (102V) through the drain plug
(912.11).
Unscrew pipe unions of all flush- and cooling-
water-pipes and drain lubrication oil from bearing
bracket (330) via the screwed plug (903.51).
Remove coupling guard.
Remove spacer of the spacer type coupling.
Loosen screws for support foot (183) from the
base frame.
Hang the Back Pull Out Assembly onto a lifting
device, so that it won´t sink down or press into the
volute casing during the dismounting. Example
see picture 9 for lifting recommendations.
pic 9
Loosen hexagen head bolt (901.11) from the
casing.
Using the jack screws provided (901.42), separate
the Back Pull Out Assembly from the casing.