An Insider’s Tip for Pumps: Why You Should Consider Borosilicate

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The Alternative — a Magnetically Coupled Pump

With a permanent magnetically coupled pump, these problems are avoided altogether. The pumps with magnetic coupling can be used for process-reliable conveying of hazardous media due to the hermetic seal of the pump parts that come in contact with the product.

Such a pump functions in a manner similar to a pump with mechanical seal, but in this case it is the magnetic coupling that forms a seal, allowing it to work leak-free. The magnetic coupling of a single-stage, non-self-priming centrifugal pump consists of an external ring that is connected to the drive shaft, an inner rotor and a canister.

Both the external and the inner rotor of the coupling are equipped with permanent magnets. Excluding the canister, stainless steel is preferred for the components of the pump that come into contact with the media which ensures a long durability. The canister between the rotors seals the pump off hermetically.

It should be noted that the canister is made of a non-magnetizable material and has a high electrical resistance in order to avoid the eddy currents generated by rotating magnetic fields. This reduces the heat generation within the pump, so that no additional cooling components are necessary, and increases the pump efficiency.

Hence, in most couplings, the nickel-based material Hastelloy is used for the canister jacket. This material is characterized by a high durability in aggressive media, a high degree of resistance to pitting, crevice corrosion and stress corrosion, as well as a high electrical resistance. This results in only a very small amount of eddy current loss.

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