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- Oils must be free of zinc and ash,
- the permissible operating limits such as flushing flow, pressure and
temperature of the seals are not exceeded.
deviating operating data are possible with special mechanical
seals. This can be found in the order-related documents.
Monitoring parameters: Dry running in the sealing chamber
6.3 Safety instructions for the operation of pumps with magnetic coupling
In the case of magnetically coupled pumps, the pumping medium is also the flushing
medium, which circulates due to the existing pressure difference within the pump and
coupling and dissipates the introduced temperature.
Pumps with magnetic couplings must be completely filled with the pumping medium.
Dry running increases the temperature and destroys the parts.
Due to the stopping of the torque transmission in the case of pump units with
magnetic couplings, damage to machinery and the risk of ignition due to excessive
heating may occur.
The magnetic coupling is designed in relation to the order. It must be ensured that the
loads during pump start-up do not exceed the design data (see
"Design data sheet for
magnetic coupling"
in the enclosed documents
and "Magnetic coupling operator's
manual").
The operating company is responsible for compliance with the permissible operating
limits.
To ensure the safest possible continuous operation, the main criterion "prevention of
dry running" must be subject to continuous monitoring. On the basis of the ignition
protection system type b1 according to DIN EN ISO 80079-37, the magnetic coupling
must be monitored as follows:
Monitoring of a pump with a magnetic coupling:
- The product supply (suction side) to the pump must be monitored
so that the liquid flow is never lost.
- A potentially explosive atmosphere on the product side of the
magnetic coupling must be safely excluded by the operating
company.
Monitoring parameters: Dry running inside the pump
- The medium is recorded in the order-related documents and the
conditions under section 3.1.2 must be complied with.
- The maximum permissible pumping media temperature for
magnetically coupled pumps must be observed (see section
3.1.3.5).
- The containment shell temperature must be monitored.
Monitoring parameters: Containment shell temperature
- In the case of pump units with magnetic couplings, the torque
transmission may be lost; this must be monitored by a load monitor
of the motor.
