Xylem MPAI - Manual (Page 84)

Installation, Operating and Maintenance Instruction
Model MP, MPA, MPAI
MP 100-english page 80 Revision 04
Article No 771074011 Issue 11/2011
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
3.5).
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.
When emptying the pipe after the pressure test,
make sure that the pump is treated properly
(danger of rust and problems when starting up).
In the case of pumps with stuffing boxes, replace
packing after pressure test (packing may be over-
compressed and thus no longer suitable for use).
5.2.2 Additional connections
Any required sealing, flushing or cooling pipe
connections must be installed. Please consult the data
sheet and/or the confirmation of order 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 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.
On operation in zone 1 and 2 a coupling with
valid Atex-certification must be used.
The Operating Instructions of the manufacturer
must be followed.
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 pipings the coupling must be
adjusted again, even, if the unit was delivered
completely mounted on the frame.
Before starting installation, carefully clean shaft
ends and coupling components.
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 the operating instructions of the
coupling. For the exact characterization of your
coupling refer to data sheet and / or order
confirmation.