IMP Pumps CV 32, PV 32 - Handbuch (Seite 15)

-15-
GB
H) Dismantling of the pump must be implemented according to the following sequence:
- The lock valves on both the pressure and suction sides must be closed.
- The electrical supply must be switched off.
- The medium in the system must be cooled to a temperature that is not dangerous for
work.
- Additional connections to the pipe should be removed.
- The screws between the pump casing and the driving generator should be unscrewed
and the two separated.
- With damage to the pump casing, loosen the screws on the flanges of the piping and
separate the entire pump from the system.
- With excessive corrosion on the connection contacts, apply any anticorrosive agent for
removing rust.
I) When dismantling do not use excessive force, as damage can occur to individual parts.
J) 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
measurements, centreline, and the parallelism between the shaft and the casing.
- The shaft must be treated within the Rmax 5 ľm ( Ra max=0,8 ali N6 ) values, other
surfaces that are important for the incorporation must be treated better than Rz 10 ľm (
Ra max=2,5 ali N7/N8).
- All edges, plates, and part surfaces coming into contact with the mechanical seal must
be smoothened or rounded (e.g. 2mm x 30 degrees by DIN 24960)
- Installation must be implemented in a clean environment and without unnecessary
force, 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!).
K) Please contact the manufacturer, distributor, authorised or maintenance service for spare
parts. For your order, please give the pump type, serial number, and the necessary part or
half product for replacement.