Integrative notes to the operating manual for magnetic coupling centrifugal pumps conforming to the ATEX 94/9/CE directive TCK... - TBK... – TBAK…
15
The
increased
vibrations could lead to other bad damages for break-up of internal and external components, lo
ss
of
synchronism between the magnets or seizing of the pump.
Fig.9 – POSSIBLE CONTAC POINTS
RESIDUAL RISK: impacts and sliding could lead to sparks development or high temperatures
inside the pump bearing, overrunning the temperature class Tx for which the pump has been
classified.
RESIDUAL RISK: the continuous impact of the rotor or the external rotor against the can could
lead to the cutting of the can thickness with consequent coming out of the pumped liquid. The
liquid could be dangerous for people, environment or other pump components and could carry
out other damage or ignition sources.
6.2.3 – Overpower transmission
The magnetic coupling is dimensioned and selected to transmit a precise maximum level of torque and power. If used
to transmit heavier loads,
for example
due to
higher viscosity or density of the fluid, different from the foreseen or
due to
presence of a
higher
pressure at the discharge,
may result
i
n
the lo
ss
of synchronism between the magnetic
rotor
s
and consequential strong vibrations, impacts and mechanical break-up.
POMPETRAVAINI take care of the correct selection of the magnetic coupling for the requested application of the
customer, following the
instructions
given by coupling supplier. The responsibility of the correct installation and use of
the pump is charged to the user.
RESIDUAL RISK: impacts and sliding could lead to the development of sparks or high
temperatures of the bearing
,
higher than the temperature class Tx for which the pump has been
classified.
6.2.3 – Functioning with presence of vibrations
The pumps with magnetic coupling must
NEVER
run in presence of vibrations or suffer vibrations during transport,
storage, or any other moment of non
-
running. It is recommended to not let the pumps suffer vibrations higher than 1,5
mm/sec and
in any case
NEVER
above 2,2 mm/sec. The magnetic coupling components are assembled with
tight tolerances and
are not suitable for
running in presence of vibrations. It is recommended to install an appropriate
vibration monitoring system to quickly stop if an increase of the pump vibrations
is
measured.
RESIDUAL RISK:
P
ump vibrations could
cause
impact or cracking
due to
brittleness of
the magnetic coupling components, with consequent possible development of sparks, high
temperatures or seizing of the pump.
This leading to really higher than the temperature class Tx for which the pump has been
classified.
6.2.3 – Functioning with not enough cooling/heating liquid
Some variation of the pumps allow a chamber
around
the internal rotor of the pump to perform a cooling or warming of
the component
s
, with the intention to keep the pumped liquid within the optimal
pump running
conditions. If the running
conditions are not satisfied
due to lack
of flow or wrong liquid temperature, the internal conditions inside the can
could change and
result in
higher power t
hrough
the magnetic coupling
and as a result
the pump
may get stuck
. The
installation of a cooling/heating system is responsibility of the user
as he
knows all the characteristics of the pumped
liquid, as it is his responsibility monitoring the system functioning.
RESIDUAL RISK: the higher power
absorbed
results in
the lo
ss
of running synchronism
between the magnets of the coupling, generating strong vibrations, impacts and sliding that
could lead to develop sparks or high temperatures of the pump bearing really higher than
the temperature class Tx for which the pump have been classified.