Notes on operation
en
Additional instructions Wilo-Crono... IL/DL/BL... ATEX, Wilo-Vero... IPL-N/DPL-N... ATEX
27
7.2
Explosion protection
If the units/pumps are used in potentially explosive atmospheres with requirements in
accordance with Directive 2014/34/EU, the measures and information contained in the
following chapter must be observed in order to guarantee explosion protection:
ƒ
Chapter "Filling/venting the pump"
ƒ
Section " Temperature limits"
7.2.1
Filling/venting the pump
The instructions contained in the installation and operating instructions
for the pump series concerning commissioning, especially with regard to
venting the pump, must be observed.
A hose must be connected to the air vent valve when venting to prevent un-
controlled discharge of the fluid into the environment. Pay special attention
to this point when operating with fluids which are harmful to persons or the
environment!
WARNING
Injuries and environmental damage due to uncontrolled discharge of
fluid!
Fluids which pose a risk to persons and the environment can cause injuries if
touched, and can cause damage to the environment!
ƒ
Dispose of fluid discharging in an uncontrolled manner in accordance with the legal
requirements!
ƒ
Wear protective clothing, protective gloves and protective goggles for the venting
process.
When operating the pump, the suction and pressure pipe system – and
therefore the interior of the pump in contact with the fluid, including the
sealing chamber – must be continuously filled with conveyance fluid. This
ensures that no explosion-capable atmosphere can occur there. If the op-
erator is unable to ensure this, he must provide appropriate monitoring
measures.
If installed incorrectly, the self-ventilation feature of the sealing chamber
could be impaired, which could then cause gas bubbles to remain in the
pump and dry running at the mechanical seal.
Operate the system in such a way that no underpressure can occur on the
suction side. For this reason, pay special attention to the correct configura-
tion and maintenance of filters and diaphragm expansion tanks as well as
conformance with and monitoring of the system pressure!
If underpressure occurs on the suction side, this indicates a prohibited op-
erating mode. Gas bubbles can form in the pump if air is sucked in through
the shaft seal. This could lead to dry running of the mechanical seal.
Provide suitable monitoring measures if necessary.
Because of reasons of design, a certain residual volume that is not filled with
fluid after filling for initial commissioning may remain. This cannot be avoided
in all cases. This volume will however be immediately filled with conveyance
fluid by the onset of the pumping action once the motor is switched on.
Ensure that the sealing chambers and auxiliary systems of the mechanical
seal are filled carefully! Observe the chapters on commissioning in the in-
stallation and operating instructions for the pump series.
7.2.2
Fluid
Only the fluids listed in chapter "Authorised operating conditions" are permitted for
pumping.
Abrasive constituents are not permitted in the fluid. The ingress of such
constituents in the pump can lead to blockage of the pump. Install a filter
in the inlet if there is a danger of solid particles entering the pump!
7.2.3
Pump operating mode
Ensure that the pump is always started with a completely opened shut-off valve on the
suction side and a slightly opened shut-off device on the pressure side.
However, the pump can be started against a closed non-return valve mounted on the
pressure side.
