3.21.2.2Tools
For maintenance and repairs use only technically appropriate tools that are in good condition. Handle them correctly. For maintenance work on the magnetic drive use preferably tools made of
3.21.2.3Shut-down
Before commencing the maintenance and inspection activities the pump must be taken out of service. The pump/pump unit must be fully depressurized. If the pumped fluid permits, let the pump cool down to the surrounding temperature.
3.21.2.4Motor safety
Take appropriate steps to prevent the motor from starting while you are still working on the pump. This is particularly important for electric motors that are started from a distance.
Follow the below described procedure:
•Set the circuit breaker at the pump to “off”.
•Turn the pump off at the control box.
•Secure the control box or place a warning sign on the control box.
•Remove the fuses and take them with you to the place of work.
•Do not remove the protective guard around the coupling until the pump has come to a complete standstill.
3.21.2.5Conservation
If the pump is not to be used for longer periods:
•First drain the pump.
•Then treat the internal parts with VG46 mineral oil or other preservering liquid.
•The pump must be operated briefly once a week or alternatively the shaft must be turned a full turn once a week. This ensures proper circulation of the protective oil.
3.21.2.6External cleaning
•Keep the surface of the pump as clean as possible. This simplifies inspection and the attached markings remain visible.
•Make sure cleaning products do not enter the ball bearing space. Cover all parts that must not come into contact with fluids. In case of sealed bearings, cleaning products must not attack rubber gaskets. Never spray the hot parts of a pump with water, as certain components may crack due to the sudden cooling and the fluid being pumped may spray into the environment.
3.21.2.7Electrical installation
•Maintenance operations on the electric installation may be performed only by trained and quali- fied personnel and after disconnecting the electric power supply. Carefully follow the national safety regulations.
Respect the
•Check if electrical devices to be cleaned have a sufficient degree of protection (e.g. IP54 means protection against dust and splashing water but not against water jets). See EN 60529. Choose an appropriate method for cleaning the electrical devices.
•Replace defective fuses only with original fuses of the prescribed capacity.
•After each maintenance session check the components of the electrical installation for visible damage and repair them if necessary.
3.21.2.8Draining of fluid
•Close off the pressure and suction lines as close as possible to the pump.
•If the fluid being pumped does not solidify, let the pump cool down to the ambient temperature before drainage.
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