Richter MNKA-B Series (ASME) - Manual (Page 13)

Installation and Operating Manual
Series MNKA-B, acc. to ASME/ANSI
9250-055-en Revision 01
TM 5976 MPE/Wm Page 13 Edition 10/2004
If the pump has been operated with a
chargeable liquid, it must be filled with inert
gas (e.g. nitrogen) to prevent an explosive
atmosphere.
It is recommended to wait one hour before the pump
is dismantled from the plant to permit static peak
charges to be eliminated.
These measures are not necessary with pumps with a
conductive plastic lining.
If the pump is returned to the manufacturer's, clean
the pump very thoroughly.
See also Section 3.1.
6.4 Restarting
When the pump is restarted, it must be ensured that
all the relative steps as described in Section 6.1 are
repeated, depending on the progress of the shutdown
operation.
6.5 Inadmissible modes of
operations and their
consequences (examples)
Inadmissible modes of operation, even for a
short time, can result in serious damage to the
unit.
In connection with explosion protection, potential
sources of ignition (overheating, electrostatic and
induced charges, mechanical and electric sparks) may
result from these inadmissible modes of operation;
their occurrence can only be prevented by adhering to
the intended use.
Pump is started up without medium :
The plain bearings in the pump may be destroyed.
Other pump components may be destroyed due to
overheating.
Suction line not opened or not opened fully :
Pump suffers cavitation – material damage.
Pump does not achieve the necessary head or
flow rate.
Pump may be destroyed due to overheating.
Discharge valve closed too much:
Pump may be destroyed due to overheating.
Axial thrust too great.
Discharge valve opened too much:
Pump can cavitate. Particularly severe with an
empty discharge line.
Risk of pressure surge.
Possible damage to the plain bearings.
Magnetic drive may stop.
Motor may be overloaded.
Suction valve and discharge valve closed:
Destruction due to rapid overheating and sharp
rise in pressure.
Control of the pump with the suction valve
Cavitation – the flow is only to be regulated on the
discharge side.
Operation with magnetic drive stopped :
If no heat is dissipated, damage to the inner and
drive magnet assemblies may occur.
7 Maintenance
7.1 Screw connections of the
housing (casing)
After initial loading by the operating pressure and
operating temperature the tightening torques of all
connection screws must be checked at the following
points:
housing (casing) flange
suction flange
discharge flange
See also Section 6.1.1, para. 1.
7.2 Motor
The operating manual of the motor manufacturer must
be observed.
A motor with a valid ATEX certificate is to be
used if employed in zone 1 and 2.
Observe the ATEX notes of the motor manufacturer.
7.3 Cleaning
Care must be taken when cleaning the pump to
ensure that it is not exposed to a strong water jet.
The ingress of water into the bearing pedestal will
substantially impair bearing lubrication.