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Guidelines for Operating Pumps in Magnetic Fields to Prevent Premature Failure

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This document outlines critical cautions regarding the operation of pumps in magnetic fields. Operating pumps within high magnetic fields can lead to the production of eddy currents in the rotor, resulting in significant heating. This heating can cause both rotor and bearing damage, leading to premature failure—potentially within just one hour. Maximum magnetic field limits and potential sources of magnetic fields are discussed, along with symptoms indicating trouble. It is crucial to follow these guidelines to maintain optimal pump performance and avoid costly repairs.

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Guidelines for Operating Pumps in Magnetic Fields to Prevent Premature Failure

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    1. 26/08/97 Issue A 1 Magnetic fields Pump should not be operated in magnetic fields Rotors cutting a magnetic field produces eddy current heating Heating thus produced causes rotor and bearing heating and premature failure COULD FAIL WITHIN 1 HOUR !

    2. 26/08/97 Issue A 2 Maximum fields Axial 7 mTesla Radial 3 mTesla

    3. 26/08/97 Issue A 3 Sources of magnetic fields Magnets from standard Penning / AIM heads Do not fit head within 100mmof turbo pump Low field AIM can be fitted at any distance Magnets used in the application Example : beam bending as in mass spectrometer heads Superconducting magnets in Sector MS machines

    4. 26/08/97 Issue A 4 Symptom of magnetic field heating Heating is produced internally - in the rotor Casing is still at an acceptable temperature Not dealt with by external cooling Power drawn increases when field is applied a few watts increase is a indication of trouble Worst case causes rapid bearing failure and/or rotor stator crash

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