Xylem LSB - Manual (Page 84)

Installation, Operation and Maintenance Instruction Model LSB
LSB 100-english page 80 Revision 02
Artikel Nr. 771076129 Ausgabe 01/2010
must be inserted next to the foundation anchors
and must lie plainly.
If vibrations are transmitted to the foundation from
adjoining components, it must be guarded through
adequate vibration damping paddings (vibrations
from outside can impair the bearing).
To prevent vibrations being transmitted to
adjoining components, the foundation should be
laid on a suitable insulating base.
The size of these insulating pads will vary,
depending on circumstances, and should
therefore be determined by an experienced
specialist.
5.2 Connection of Pipings to the Pump
The pump must not be used as fixed point for
the piping. The permitted piping loads must not
be exceeded, refer to chapter 3.5.
5.2.1 Suction and discharge pipe
The pipes must be of a size and design that liquid
can flow freely into the pump and that the pump
functions without problems. Particular attention is
to be paid to ensuring that suction pipes are
airtight and that the NPSH values are observed.
Under suction lift condition lay the suction pipe in
the horizontal section towards the pump so that it
is slightly inclined upwards so that no air traps
occur. Do not install fittings or elbows right before
the suction nozzle.
If the suction supply is under vacuum and
entrained gas may be present in the liquid, it is
recommended that a vent line (min. diameter 25
mm) be considered upstream of the pump suction
with return to the suction supply, above the max
liquid level.
An additional flushed piping - discharge branch-
vent line - makes it easier to de-aerate the pump
before start-up (pic 3).
pic 3
When laying the pipes, make sure that the pump
is accessible for maintenance, installation and
disassembly.
Notice "Permitted Forces on Flanges" (chapter
3.7).
If expansion joints are used in the pipes, they
have to be supported in such a way that the pump
is not loaded unduly high because of the pressure
in the pipes.
Before connecting up to pump: remove protective
coverings from suction and discharge branches.
Before starting up, the pipe system, fittings and
equipment must be cleaned to remove weld
spatter, scale etc. Any pollutants are to be
completely removed from pump units that are
directly or indirectly connected to drinking water
systems before being installed and taken into use.
To protect the shaft sealing (especially mechanical
seals) against foreign impurities, it is
recommended that a sieve, 800 micron, is
installed in the suction / intake pipe when the
motor is being started up.
If the pipe system is tested with the pump
installed, do not exceed the maximum permitted
casing pressure of the pump and/or shaft sealing
(see data sheet).
When emptying the pipe after the pressure test,
make sure that the pump is treated properly
(danger of rust and problems when starting up).
5.2.2 Additional connections
Any required sealing, flushing or cooling pipe
connections must be installed. Please consult the data
sheet to see which pipes, pressures and amounts are
necessary. The position and size of connections to the
pump are given in the appendix, "Connections".
These connections are essential for the
function!
It is recommended that a pipeline is installed to take
off any leakage from the shaft seal. For connection,
see appendix, "Connections".
5.3 Drive
Note the Operating Instructions of the motor
manufacturer.
On application in zone 1 and 2 a motor with
valid Atex-certification must be used.
If in the process of the repair a new motor is used , the
following has to be noticed:
The motor must comply with the requirements
stated in sheet 1220.1A608 (order from
manufacturer, on demand).
Clean motor end and motor flange of new motor
carefully (remove varnish).
5.4 Electric Connection
Electrical connection work may only be carried
out by an authorised professional. The rules
and regulations valid for electrical technology,
especially those concerned with safety
measures, must be observed. The regulations
of the national power supply companies
operating in that area must also be observed.
Before starting work, check that the information on the
motor name plate is the same as the local mains
network. The power supply cable of the coupled drive