Pipe Work - salmson NOLH Installation Et Mise En Service

ENGLISH
Using a straight‐edge and a caliper :
Using a dial gauge :
When checking parallel alignment, the total indicator read‐out
shown is twice the value of the actual shaft displacement.
Align in the vertical plane first, then horizontally by moving the motor.
Lifetime of ball bearing and coupling flexible part as well as pumpset
noise level will depend on the alignment quality.
Coupling alignment is not necessary when a IEC adaptation lantern is
used. Both motor and pumps shaft are aligned by construction.
7.2 PIPE WORK
Pump connection flanges are plugged to avoid any contamination during
transport and storage. Protective covers should be removed only before
installing the pump in the piping. Remove dust before removing the
covers from pump flanges. Especially for new pipe work : clean
thoroughly piping before connecting it to the pump.
 Remove protective covers
 Add flange gaskets
 Fasten suction pipe
 Fasten discharge pipe
No stress must be applied to the pump casing by the pipe work. If
excessive, those forces and moments cause misalignment,
overheating of bearings, coupling wear, vibrations and possible failure or
explosion of pump casing.
After replacement of a pump or during connection of pipes to
pump flanges, never use pump flanges as a support to pull or push
the pipe works.
The axial displacement of expansion coupling (if installed) should be
limited. Use tie rods as recommended by the manufacturer.
Two designs are possible for the suction line : positive suction head and
suction lift operation.
Positive suction head operation :
Nominal diameter of the pipeline is often larger diameter than pump
suction flange. Unequal nominal diameter should be compensated by an
eccentric transition part. It is recommended to install a straight pipe
before the pump inlet (size L should be 2 to 3 times the pipe nominal
dimension). The suction line should be laid with a downward slope
toward the pump.
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Negative suction head operation :
The suction line intake should be located below the minimum level of
the liquid and a strainer with non return foot valve should be installed.
The strainer should be set far enough from pit bottom to avoid excessive
suction head loss and particle intake. Ensure that there is no air intake
along suction line and avoid any air pockets creation.
Suction lift line should be laid with a rising slope towards the pump. A
straight pipe (length should be 8 to 10 times the pipe nominal diameter)
should be added in front of pump. Nominal diameter of the pipeline is at
least equal to the pump inlet size. Pipe diameter is calculated to limit
flow speed to 2m/s.
The size of the suction strainer/foot valve will be selected to ensure
minimum pressure losses in strainer and full opening of NRV at pump
nominal flow.
Check that pump required NPSH (NPSH
available NPSH (NPSH ).
A
Discharge pipe :
Nominal diameter of discharge pipe should be chosen to ensure a max
flow speed of 3m/s.
Filter/strainer :
If required a filter can be installed before the pump intake. To ensure
proper working of pump the equivalent exchange surface of the strainer
should be 3 times the pipe sectional area.
Clogging state of filter/strainer should be checked regularly.
Valves :
It is advised to install isolating valves on suction and discharge side for
maintenance purpose. Those valves should be of large passage type and
could be locked in position.
Isolating valve on suction side should not be connected directly to pump
suction flange.
Non‐return valve :
A check valve can be installed on discharge side to protect the pump
from back flow effects such as pressure surges or back flow when the
pump is stopped.
Auxiliary pipe :
For most of applications a single mechanical seal is used. If the sealing
must be equipped with auxiliary equipments check that there are no
leakages and that direction of flow is respected.
Shaft sealing :
Gland packing :
If the pump is installed for suction lift operation and discharge pressure
is small (less than 10mwc), it will be necessary to add a quench to avoid
air intake trough the packing rings.
Single mechanical seal with external quench :
External piping system or raised tank should be installed in the state of
the art. Pressure in the quench should not exceed 0,35 bar.
After pipe work is done turn pump shaft by hand and check it turns
freely. If it appears that it is difficult to turn pump shaft, then check
forces applied by piping to pump casing. Installation of piping should be
done again.
Location of connections :
Bracket sizes 25, 35 and 45 :
) is lower than system
R