DVZ Biomaster PLUS Series, Final Documentation

Page: 113 / 145

Issue: 18.10.2011 DVZ-SKA-”BIOMASTER”-PLUS – Pump P2 Page 6 of 6
SKA-PLUS-ANNEX P5-Eng
Figure 1: Cutting packing rings to size
Pre-pressed packing rings or rings cut to size must
carefully be opened axially and radially just far enough
for them to be pushed over the shaft. Bending the rings
up may result in damage due to buckling.
When fitting in the packing area, the packing rings must
be carefully bent back into their ring shape. The cut joints
must be staggered by 90°. Each ring must be pushed into
the gland housing with the cut ends first, with the
assistance of the gland. Lantern rings or flushing rings
are to be fitted in the correct sequence.
ATTENTION: Sharp tools must never be used for
installation, as there is a danger of damaging the shaft
and deforming the packing material.
–Commissioning the gland packing after re-packing
The gland packing should only be lightly tightened before
commissioning. During pump start-up, a leakage rate of
50 to 200 drops per minute is permitted.
Within 30 minutes of start-up, the leakage must be
gradually and evenly reduced to a minimum of 2 to 20
drops per minute by adjusting the gland (203) by means
of the hexagonal nuts (202).
ATTENTION : During this process the temperature the
gland packing must not rise abnormally. Approx. 20 to
60°C above the temperature of the liquid pumped is
permissible. If the temperature rises suddenly, the gland
must be slackened immediately, and the start-up
procedure repeated.
The leakage can be drained via the tapped hole located in
the drip pan of the motor bracket.
Damage to people and the environment due to
leakage of hazardous materials must be prevented.
2. Mechanical seal
Non-balanced mechanical seals are used in all material
combinations and models. The mechanical seal is
maintenance-free.
In the event of severe leakage due to wear, the
mechanical seal must be replaced (please see
disassembly and assembly instructions).
ATTENTION: As dry running of mechanical seals must
be avoided, the pump must only be started in filled
condition and with auxiliary devices connected, if
provided.
Servicing (disassembly and assembly
instructions)
General
Trained service engineers will be available for installa-
tions and repairs on request.
When repairs are performed by the user’s own personnel
or by our service engineers, it is essential that the pump
is completely drained and cleaned.
This applies particularly to pumps that are returned for
repair to our factory or to one of our authorised service
centres.
In order to protect our staff and for the sake of environ-
mental protection, repairs on pumps filled with pumping
liquid will be refused. Otherwise, we will have to charge
the customer/user for the costs of ecological waste dis-
posal.
If repairs are required on pumps that have handled
hazardous materials and/or liquids that are harmful
to the environment, the customer/user must voluntarily
inform his own or our installation personnel of this on
site. This also applies if such a pump is returned to our
factory or to one of our authorised service centres. In
this case, evidence of the liquid pumped, for example in
the form of a DIN safety data sheet, must be submitted
to us when the request for a service engineer is made.
For all work executed on site, the user’s own personnel
and/or our service engineers must be alerted to dangers
that may arise in connection with repairs.
The most important disassembly and assembly
operations are described in these instructions. The
assembly steps described in the individual sections must
be consistently followed.
Disassembly of the progressive cavity pump
Before commencing disassembly, the following
operations must be performed:
- Disconnect the power supply cable to the motor.
It must not be possible to start the motor.
- Close all shut-off devices in the suction and discharge
lines.
- Drain the pumped liquid from the suction casing by
removing the screw plug (502).
Note :Use a drip pan to collect the drained liquid.
- Disconnect the suction and discharge pipelines as well
as all auxiliary piping.
- Unscrew the bolts at the pump feet.
Removal of the stator
- Remove hexagon nuts (609) and washers (610) from
the connecting bolts (611).
- Pull off the discharge housing (504).
- Remove connecting bolts (611) and stays (612), if
provided.
- Pull the stator (402) off the rotor (401).
Note: If difficulty is experienced, rotate the stator (402)
with a chain wrench at the same time. In order to do
this, secure the hollow shaft (125).
- With plastic or metal stators, remove the stator gaskets
(403) and (404).