IMP Pumps ECL - Handbuch (Seite 24)

-24-
GB
- With mechanical damage to the original
parts of the pump, it is necessary to call an
authorised maintenance service or install
spare parts from the pump manufacturer.
- Dismantling of the pump must be
implemented according to defined rules:
a) The lock valves on the pressure and
suction sides must be closed.
b) The electrical supply must be switched
off.
c) The medium in the system must be
cooled to a temperature that is not
dangerous for work.
d) Additional connections to the pipe
should be removed.
e) The screws between the pump casing
and the driving generator should be
unscrewed and the two separated.
f) With damage to the pump casing,
loosen the screws on the flanges of the
piping and separate the entire pump
from the system.
g) With excessive corrosion on the
connection contacts, apply any
anticorrosive agent for removing rust.
- The dismantling must be completed in the
correct sequence without using excessive
force, as damage can occur to parts where
no damage has yet occurred.
- Damage to the mechanical seal is a sign
that it should be replaced entirely. During
dismantling care should be taken not to
damage the contact patches and seats
were the mechanical seal is fitted.
- If there is damage to parts that are
functionally important for the sealing of the
mechanical seal, it is necessary to change
them with the original manufacturer’s parts.
Before re-fitting the mechanical seal, all
contact surfaces should be cleaned from
dirt and impurities.
- It is necessary to control the installation
measurements, as well as the seal meas-
urements, centreline, and the parallelism
between the shaft and the casing.
- The shaft must be treated within the
Rmax 5 ľm (Ra max=0.8 or N6) values,
other surfaces that are important for the
incorporation must be treated better than
Rz 10 ľm (Ra max=2.5 or N7/N8).
- All edges, plates, and part surfaces coming
into contact with the mechanical seal must
be smoothened or rounded (e.g. 2 mm x
30 degrees by DIN 24960)
- Assembly must be implemented very
carefully in a clean environment.
Constraints should not be used, as there is
a danger of plastic deformation, cracking,
and breakage of the ceramic material.
- The installation or dismantling sequence of
the mechanical seal should be adapted to
the pump construction.
- To reduce friction during installation all
plate rubbers that are laid on the shaft
should be moistened with water or alcohol,
or they should be covered with silicone
grease.
- There are special instructions for storage
and handling of elastic materials: Natural
rubber must not come into contact with
mineral based oils and lubricants!
- The stator is not foreseen for plastic
deformation as breakage can occur.
- Flat surfaces must not be unclean or soiled
with oils, but must be dry, dust free and
carefully installed.
- For the MG variation, the elastic materials
should be moistened with water and
pushed circularly onto the shaft. Oils and
lubricants must not be used! Pressure may
be applied only to the edges of the rounds
parts. After installing all the parts, it is
necessary to check if the seal has adapted
well.
- The regulatory materials do not require
maintenance if we know the overlap
position. A forcible circulation of the pump
where the seal is installed is necessary
with warm medium to prevent deposits on
the single seals in a compressed state.
- All the air in the seal casing for internal
use must be carefully bleed out, and
the mechanical seal must be completely
submersed in the medium (there can be no
dry run!).
When ordering spare parts contact the
manufacturer or a maintenance service
and include the pump type, serial number,
the necessary part or half product for
replacement, and the desired quantity in your
order,