AU
7
a
1
D
D
b
a
2
Ø
Ø
S
2
b
S
1
D
Ø
D
Ø
a
2
a
1
|a1-a2|
and
b
maximums
[mm]
0-1500 1500-3000 3000-4000
DØ
[mm]
[rpm] [rpm] [rpm]
S
1
[mm]
S
2
[mm]
58-140
0.20 0.15 0.10 4
5
160-225
0.30 0.20 0.15 6
250-280
0.35 0.30 ---
8
Note: For other types of coupling, see their instructions
manual.
The equipment must always be aligned after
mounting and preparing for start up.
5.2.2 Monobloc
groups
Levelling
Use a spirit level to level the equipment. Use wedges to alter
the height at different points. The maximum deviation
permitted is 0.2 mm/m.
Pump - motor alignment
The equipment is aligned at factory, and this alignment must
never be lost. The following instructions must be followed
when dismounting or returning the motor:
- Check that the flange support surface of the motor
support and of the motor itself are perfectly clean and
smooth.
- The motor shaft should easily enter the pump shaft (or
bushing). If it is not, do not force assembly as this will
damage the motor bearings. Check the alignment
between both shafts and repair or replace them as
necessary.
5.3 Pipe
joint
In no case can the pump be used as a fixed point for the
pipes.
The pipe system must at no time exercise force in
excess of the values shown in the chart in point 4.5
(due to connection, thermal variation, etc) in the
pump.
The short pipes must be of at least the diameter of the pump
connections. The diameter of long pipes is, in some cases,
determined by economic criteria.
Transition pieces at larger diameters must have an extension
angle of around 8°, in order to prevent pressure drops.
The convenience of installing foot valves
when the pump is working in suction or
retention when loaded, along with seal valves, will depend on
the type of installation.
Note
The thermal expansions of the pipes must be compensated
with suitable measures, in order not to exceed the maximum
stresses permitted on the pump.
The diameters of the pipes, valves and accessories must be
calculated in line with the load losses envisaged in the
installation, meaning the fluid speeds will be:
- Speed in the discharge pipe: from 2 to 3 m/s
- Speed in the suction pipe: from 1 to 2 m/s
Exceeding the admitted stresses of the pipes may
lead to leaks in the pump and to the fluid escaping.
Hazard of death with hot liquids!
The suction and impulsion nozzle covers of the pump must be
removed before connecting the pipes.
Before starting up a new installation, it is necessary to
thoroughly clean the tanks, pipes and accessories by brushing
and blowing. Welding material, scales and other impurities are
often cast off some time after. We recommend using an
oversized sieve filter in suction in order to prevent dirt larger
than that permitted by the pump from coming in.
If hoses are fitted, these must be firmly in place
before proceeding with start-up or during operation,
in order to prevent any possible whiplash as a result
of the pressure generated by the pump.
High suction pressure may overload the bearings and
lead to their overheating. This circumstance must be
avoided, to which end the suction pressure must not exceed
that shown in the data sheet, either through manual control by
the operators or through devices which shutdown the
equipment in the event of excessive pressure.
The pump must not work without liquid under any
circumstance. If this condition may come about, the
installation must be fitted with safety devices which prevent
the operation of the pump without liquid inside, or have
automatic devices to discharge the minimum flow of the pump.
See the section on minimum flow.
5.3.1 Auxiliary
connections
The equipment is normally delivered mounted and ready for
immediate operation, with only the hydraulic and exterior
electrical connections being necessary.
When using clean fluids, the cooling of the mechanical seal is
by way of the recirculation of the pumping fluid (it is not
necessary to inject exterior fluid).
Auxiliary pipes are designed exclusively to
support internal stresses due to the pressure
of the circulating fluid, to which end it is forbidden to subject
them to additional exterior stresses (e.g. for support, etc.)
If the pumping liquid is fuel and the leak can lead to
ignition, this contingency should be avoided through
constant control of the seal tightness of the auxiliary pipe
joints by the plant operator.
Note
Note
