Richter MPB 25-25-115 - Manual (Page 6)

Series MPB, close-coupled design Page 6
9240-050-en Revision 05
TM 7345 Edition 10/2008
2.3 For maintenance
In principle, work on the unit may only be performed
when it is at a standstill.
It is imperative to observe the procedure for stopping
the machine described in this operating manual. See
Section 6.3.
Pumps which convey media which are a health
hazard must be decontaminated.
All safety and protective facilities must be remounted
or enabled immediately after the end of work.
In the assemble state, if the safety notes (see also
Section 5.1 and 7.5.2) are observed, the magnetic
drives do not cause any risks or have any affect on
the environment.
During dismantling and assembly as well as
during transport and storage of the magnetic
drives as single components, the notes on
safety in Section 7.5.2 must be observed.
The points listed in Section 6.1 must be followed
before recommissioning.
2.4 Conversion work and
production of spare parts by
the customer
Conversion of or changes to the machine are only
admissible after consultation with the manufacturer.
Original spare parts and accessories authorised by
the manufacturer serve to enhance safety.
The use of other parts may annul the liability for any
resultant consequences.
2.5 Improper operation
The operational safety of the machine supplied is only
guaranteed if it is used properly in accordance with
Section 2.1 of this operating manual.
The operating limits specified in the data sheet must
under no circumstances be exceeded.
2.6 Explosion protection
If the units are used in potentially explosive areas, the
measures and notes in Sections 2.6.1 to 2.6.9 are
imperative to guarantee the explosion protection.
2.6.1 Filling the unit
During pump operation the wetted interior of
the pump must always be filled with the liquid
medium.
This prevents any explosive atmosphere and the risk
of dry-running.
If the customer cannot ensure this, we
recommend that appropriate monitoring
facilities be provided.
All auxiliary, heating and cooling systems
must also be carefully filled.
2.6.2 Special operating conditions
In the standard design the can chamber and
the plain bearings are cooled and lubricated
by a flushing flow.
The cooling flow may be interrupted and an
inadmissible rise in temperature may occur due to
properties of the liquid (e.g. sticking, clogging, ingress
of gas etc.). Appropriate monitoring facilities are to be
provided. See Section 5.6.
For safe pump operation, we recommend a flow rate
of 0.3 to 1.1 Q
opt
. If the pump is operated outside this
range, it must be ensured that the max. admissible
flow rate according to the pump characteristic curve is
not exceeded and that the max. admissible operating
temperature according to Section 2.6.7 is observed.
If the flow rate is too high, the differential pressure
upstream and downstream of the plain bearings could
fall so much that a lack of lubrication or dry-running
may occur.
If the flow rate is too low, the medium may heat up so
much owing to the fluid friction that the max.
admissible surface temperature of the relevant
temperature class is exceeded
Overloading, overheating, non-observance of the
design data or the incorrect selection of the magnetic
drive can lead to the decoupling of the inner and outer
magnet assemblies. As a result, eddy currents are
induced on the inner and outer magnet assemblies
and an inadmissible rise in temperature may occur.
The situation is to be remedied by providing
appropriate monitoring facilities. See Section 5.6.
The plant NPSH value (NPSHA) should be 0.5 m
higher than the NPSH value of the pump (NPSHR) to
prevent a lack of lubrication or dry-running of the plain
bearings.
2.6.3 Chargeable liquids
For operation with chargeable liquids with a
conductivity < 10
-8 S/m inert gas must be used
for flushing during drain if the lining of the
pump is non-conductive. See Section 6.3.
2.6.4 Identification
The identification on the pump relates to the
pump section. A separate declaration of
conformity must be provided for the motor
and for other attachments as well as corresponding
identification.
Example of the identification of the pump section:
CE Ex II 2 G/D T1-T4.