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8
Decommissioning/removal
8.1
Personnel qualifications
8.2
Operator's obligations
8.3
Decommissioning
Installation and operating instructions Wilo-EMU TR/TRE 216 ... 326-3
Decommissioning/removal
Increased current consumption
Depending on the fluid and the flow, the current consumption may vary slightly. If current
consumption is elevated for a longer period, this indicates a change in configuration. The
cause for a change in circumstances could be:
ƒ
A change in the viscosity and density of the fluid, e.g. caused by modified addition of
polymers or precipitating agents. CAUTION! This modification may cause a severely in-
creasing power consumption and even overload the system!
ƒ
Insufficient mechanical pre-cleaning, e.g. fibrous and abrasive content.
ƒ
Non-homogeneous flow conditions due to fixtures or deflections in the operating space.
ƒ
Vibrations due to blockage of the basin inlet/outlet and draining, modified air intake
(aeration) or the combined effect of several mixers.
Check system configuration and take countermeasures. CAUTION! Permanently increased
current consumption causes increased wear on the mixer! Contact customer service for
further assistance.
Monitoring fluid temperature
The fluid temperature must not drop below 3 °C. A fluid temperature below 3 °C results in
thickening of the fluid, which can lead to fractures in the propeller. If the fluid temperature
may sink below 3 °C, install an automatic temperature measurement device with advance
warning and deactivation functions.
Monitoring minimum immersion
The propeller must not emerge from the fluid during operation. Minimum immersion specifi-
cations must be observed! If fluid levels fluctuate significantly, install a level monitoring de-
vice. If the fluid level drops below the minimum immersion level, switch off the mixer.
ƒ
Operation/control: Operating personnel, instructed in the functioning of the complete
system
ƒ
Electrical work: qualified electrician
Someone with suitable technical training, knowledge and experience who can identify
and avoid the dangers associated with electricity.
ƒ
Installation/dismantling work: trained sewage technology professional
Fixation to different construction parts, lifting equipment, wastewater facility basics
ƒ
Lifting work: trained professional for operating lifting devices
Lifting equipment, lifting gear, attachment points
ƒ
Locally applicable accident prevention and trade association safety provisions.
ƒ
Observe all regulations for working with and underneath heavy suspended loads.
ƒ
Make available the required protective equipment and ensure that the personnel wear
the protective equipment.
ƒ
Ensure sufficient aeration in closed rooms.
ƒ
If toxic or suffocating gases build up, immediately initiate countermeasures!
The mixer is deactivated, but remains installed. This ensures that the mixer is always ready
for operation.
‡
To protect the mixer from frost, ice and direct sunlight, immerse the mixer completely
in the fluid.
‡
Minimum fluid temperature: +3 °C (+37 °F).
1. Switch off the mixer.
2. Secure the operating point against being switched on again by unauthorized persons
(e.g. lock main switch).
▶ The pump has been decommissioned and can be dismantled.
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