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8
Decommissioning/removal
8.1
Personnel qualifications
32
Decommissioning/removal
WARNING
The propeller blade has sharp edges!
Sharp edges can form on the propeller blades. There is a risk of limbs being severed. Wear
safety gloves to protect against cuts.
During operation, observe the local regulations on the following subjects:
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Workplace safety
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Accident prevention
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Handling electrical machines
Strictly adhere to the personnel's work plan determined by the operator. All personnel are
responsible for adhering to the work plan and regulations!
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Operating voltage (+/-10 % of the rated voltage)
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Frequency (+/-2 % of the rated frequency)
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Current consumption between the individual phases (max. 5 %)
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Voltage difference between the individual phases (max. 1 %)
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Max. switching frequency
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Minimum immersion of the propeller
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Smooth/low-vibration running
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:
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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!
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Insufficient mechanical pre-cleaning, e.g. fibrous and abrasive content.
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Non-homogeneous flow conditions due to fixtures or deflections in the operating space.
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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.
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Operation/control: Operating personnel must be trained in how the complete system op-
erates
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Electrical work: qualified electrician
Someone with suitable technical training, knowledge and experience who can identify
and avoid the dangers associated with electricity.
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Installation/dismantling work: trained sewage technology professional
Fixation and pipework in wet well and dry well installation, lifting equipment, basic
knowledge of wastewater facilities.
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Lifting work: trained professional for operating lifting devices
Lifting equipment, lifting gear, attachment points
WILO SE 2021-05
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