Select country

Keeping the Hadron Collider Hot

07 September 2017

Using magnetic drive pumps to circulate hot oil

NDM magnetically driven ISO 2858 pump.

Experimental particle physics.

To replace a vertical hot oil pump on the oil heater for the AWAKE Project on the Hadron Collider at CERN that was failing due to the temperature of the oil. The experiment required a range of temperatures from 20 oC to 235oC which meant that the pump couldn't transfer too much heat into the oil during the low temperature experiments. The unit had to be compact and be extremely reliable as maintenance isn't possible due to periods of high radiation levels in the tunnel.

A close coupled magnetically driven NDM pump run via a remote VSD and connected to the oil heating tank via new pipework and fittings including a bellows.

Magnetically driven pumps have no seals and as the internal components are held in place by the magnetic couple, friction and therefore wear is significantly reduced within the pump chamber.

There is virtually no maintenance requirement as there are no seals to replace. If for some reason maintenance is required, the pump chamber assembly can be easily disengaged from the motor bracket.

As the motor shaft does not enter the pump chamber and the air gap between the rear pump chamber and drive magnet acts as a thermal barrier, magnetically driven pumps can minimise heat transfer into chilled liquids and are capable of handling high temperature fluids.

The motor speed was controlled with VSD's to allow the pump to deliver varying flows as required by the experiments different phases.