DVZ Biomaster PLUS Series Final Documentation Download

Page: 103 / 145

Issue: 04.05.2011

DVZ-SKA-”BIOMASTER”-PLUS – Pump P2

Page 6 of 6

SKA-PLUS-ANNEX P2-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.