Installation | Operation Manual MIDIDOS E | 13
7. Installation
7.1 General information
For the selection of a dosing pump when designing a system as well as for the installation
and operation, local rules and regulations must be obeyed. This applies to the selection
of appropriate materials of construction for the pump, the handling of chemicals and the
electrical installation.
Likewise the technical data of the dosing pump (chapter 4) must be taken into considerati-
on. The system must be designed accordingly/properly (e.g. loss of pressure in the piping,
depending on nominal diameter and length).
The designer and the operator are responsible for ensuring that the whole system
including the dosing pump is constructed in such a way that neither plant equipment nor
buildings are damaged in the case of chemical leakage due to the failure of wear parts
(e.g. a rupture in the dosing membrane) or burst tubing. If the chemical system poses
great potential danger, the installation must be carried out in such a way that that no
unreasonably high consequential damages occur, even if the dosing pump fails. Therefore
we recommend the installation of leakage probes and containment tanks.
The draining pipe of the dosing head must be visible in order for a diaphragm failure to be
detected. The flow from the drainage pipe must be routed downwards without obstacles.
To increase the dosing accuracy and to ensure the functional reliability, we recommend the
use of additional accessories. These include, amongst others, backpressure valves, relief
valves, leakage probes and low level indicators, as shown in the installation examples.
Always use appropriate tools for the installation of plastic connecting parts. To avoid
damage, never apply excessive force.
IMPORTANT!
Plastic parts (especially parts made out of PVC) can be tightened and loosened with grea-
ter ease if the thread is first lubricated with Vaseline or silicon grease.
NOTICE!
The compatibility of the lubricant with the dosing chemicals must be verified.
7.2 Installation location
The installation location of the dosing pump must be easily accessible for the operating
and service staff. When installing the dosing pump below the level of the process fluid,
care must be taken to ensure that chemical leakages due to a broken diaphragm cannot
cause any damage for example – collection pan, leakage sensor.
Further more it is possible to install the pump direct to the dosing supply tank.
The maximum environment temperature permissible for the dosing pump must be obser-
ved (see technical specifications). Heat radiation from the apparatus and heat exchanges
must be shielded from radiation heat, so that the dosing pump can sufficiently emit it own
heat. Direct sunlight must be avoided. When the dosing pump is installed in the open, a
canopy is provided as protection the effect of the weather.
IMPORTANT!
CAUTION!
