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Verticalization and Noise Damping

The fridge is mounted on air bumpers intended to dampen vibrations and keep the fridge level. Occassionally these go flat and need to be refilled. When the dampers are empty, the fridge will tend to rise up too high rather than bottom out. This is because the still line is under vacuum and the weight of the fridge rests on the still turbo and PT cooler.


\begin{shaded}
\begin{itemize}
\item {\bf HOW OFTEN:} As needed.
\item {\bf SYSTEM STATUS:} Any.
\end{itemize}\end{shaded}

You will need:

Procedure:
The bumpers on the bottom of the fridge pull the fridge down, while the ones on the top pull the fridge up.

  1. Pump air into each of the bottom four bumpers until the support plate is almost touching the stops on the bottom. (So the fridge should be nearly bottomed out.)
  2. Next, add air to the top and bottom bumpers so that there is a reasonable amount of air in the top bumpers but the fridge is still floating above the bottom bumpers.
  3. Finally, go around with a level and adjust the bumpers - adding or removing air - to get the fridge plate level.

When done, the support plate should be floating level a few mm above the bottom bumpers. This may take some time.


next up previous contents
Next: Tests Up: Maintenance Previous: Servicing the KNF compressor   Contents
Jonathan Ouellet 2014-08-26